[v6.6] KASAN: slab-use-after-free Read in xfrm_alloc_spi
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syzbot
Aug 28, 2025, 12:50:37 PM8/28/25
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Hello,
syzbot found the following issue on:
HEAD commit: cc1a1c5b404a Linux 6.6.103
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=102c3c62580000
kernel config: https://syzkaller.appspot.com/x/.config?x=412020841cf033b0
dashboard link: https://syzkaller.appspot.com/bug?extid=d1b064a9c8637489ebe5
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/46c06862a545/disk-cc1a1c5b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/38ddabb6fc8b/vmlinux-cc1a1c5b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b130b7d031b5/bzImage-cc1a1c5b.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d1b064...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-use-after-free in xfrm_state_lookup_spi_proto net/xfrm/xfrm_state.c:1477 [inline]
BUG: KASAN: slab-use-after-free in xfrm_alloc_spi+0x598/0x11f0 net/xfrm/xfrm_state.c:2302
Read of size 4 at addr ffff88805e5e5ca0 by task syz.3.3616/14521
CPU: 1 PID: 14521 Comm: syz.3.3616 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
<TASK>
dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:364 [inline]
print_report+0xac/0x220 mm/kasan/report.c:468
kasan_report+0x117/0x150 mm/kasan/report.c:581
xfrm_state_lookup_spi_proto net/xfrm/xfrm_state.c:1477 [inline]
xfrm_alloc_spi+0x598/0x11f0 net/xfrm/xfrm_state.c:2302
xfrm_alloc_userspi+0x5d1/0xa90 net/xfrm/xfrm_user.c:1623
xfrm_user_rcv_msg+0x596/0x870 net/xfrm/xfrm_user.c:3169
netlink_rcv_skb+0x216/0x480 net/netlink/af_netlink.c:2545
xfrm_netlink_rcv+0x79/0x90 net/xfrm/xfrm_user.c:3191
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x751/0x8d0 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x8c1/0xbe0 net/netlink/af_netlink.c:1894
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
____sys_sendmsg+0x5bf/0x950 net/socket.c:2595
___sys_sendmsg+0x220/0x290 net/socket.c:2649
__sys_sendmsg net/socket.c:2678 [inline]
__do_sys_sendmsg net/socket.c:2687 [inline]
__se_sys_sendmsg+0x1a5/0x270 net/socket.c:2685
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f46f138ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f46f222e038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f46f15b5fa0 RCX: 00007f46f138ebe9
RDX: 0000000000000000 RSI: 0000200000000840 RDI: 0000000000000003
RBP: 00007f46f1411e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f46f15b6038 R14: 00007f46f15b5fa0 R15: 00007fff1fba90a8
</TASK>
Allocated by task 12702:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:52
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:328
kasan_slab_alloc include/linux/kasan.h:188 [inline]
slab_post_alloc_hook+0x6e/0x4d0 mm/slab.h:767
slab_alloc_node mm/slub.c:3485 [inline]
slab_alloc mm/slub.c:3493 [inline]
__kmem_cache_alloc_lru mm/slub.c:3500 [inline]
kmem_cache_alloc+0x11e/0x2e0 mm/slub.c:3509
kmem_cache_zalloc include/linux/slab.h:711 [inline]
xfrm_state_alloc+0x22/0x2a0 net/xfrm/xfrm_state.c:661
__find_acq_core+0x7d8/0x19d0 net/xfrm/xfrm_state.c:1598
xfrm_find_acq+0x6a/0x90 net/xfrm/xfrm_state.c:2070
xfrm_alloc_userspi+0x57a/0xa90 net/xfrm/xfrm_user.c:1613
xfrm_user_rcv_msg+0x596/0x870 net/xfrm/xfrm_user.c:3169
netlink_rcv_skb+0x216/0x480 net/netlink/af_netlink.c:2545
xfrm_netlink_rcv+0x79/0x90 net/xfrm/xfrm_user.c:3191
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x751/0x8d0 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x8c1/0xbe0 net/netlink/af_netlink.c:1894
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
____sys_sendmsg+0x5bf/0x950 net/socket.c:2595
___sys_sendmsg+0x220/0x290 net/socket.c:2649
__sys_sendmsg net/socket.c:2678 [inline]
__do_sys_sendmsg net/socket.c:2687 [inline]
__se_sys_sendmsg+0x1a5/0x270 net/socket.c:2685
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
The buggy address belongs to the object at ffff88805e5e5c00
which belongs to the cache xfrm_state of size 848
The buggy address is located 160 bytes inside of
freed 848-byte region [ffff88805e5e5c00, ffff88805e5e5f50)
The buggy address belongs to the physical page:
page:ffffea0001797900 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88805e5e5c00 pfn:0x5e5e4
head:ffffea0001797900 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff88801d68b140 dead000000000122 0000000000000000
raw: ffff88805e5e5c00 0000000080100008 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x152820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 6194, tgid 6192 (syz.1.135), ts 90423707701, free_ts 90238784701
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x1cd/0x210 mm/page_alloc.c:1554
prep_new_page mm/page_alloc.c:1561 [inline]
get_page_from_freelist+0x195c/0x19f0 mm/page_alloc.c:3191
__alloc_pages+0x1e3/0x460 mm/page_alloc.c:4457
alloc_slab_page+0x5d/0x170 mm/slub.c:1876
allocate_slab mm/slub.c:2023 [inline]
new_slab+0x87/0x2e0 mm/slub.c:2076
___slab_alloc+0xc6d/0x12f0 mm/slub.c:3230
__slab_alloc mm/slub.c:3329 [inline]
__slab_alloc_node mm/slub.c:3382 [inline]
slab_alloc_node mm/slub.c:3475 [inline]
slab_alloc mm/slub.c:3493 [inline]
__kmem_cache_alloc_lru mm/slub.c:3500 [inline]
kmem_cache_alloc+0x1b7/0x2e0 mm/slub.c:3509
kmem_cache_zalloc include/linux/slab.h:711 [inline]
xfrm_state_alloc+0x22/0x2a0 net/xfrm/xfrm_state.c:661
__find_acq_core+0x7d8/0x19d0 net/xfrm/xfrm_state.c:1598
xfrm_find_acq+0x6a/0x90 net/xfrm/xfrm_state.c:2070
pfkey_getspi+0x64f/0xed0 net/key/af_key.c:1365
pfkey_process net/key/af_key.c:2847 [inline]
pfkey_sendmsg+0xbed/0x1050 net/key/af_key.c:3698
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
____sys_sendmsg+0x5bf/0x950 net/socket.c:2595
___sys_sendmsg+0x220/0x290 net/socket.c:2649
__sys_sendmsg net/socket.c:2678 [inline]
__do_sys_sendmsg net/socket.c:2687 [inline]
__se_sys_sendmsg+0x1a5/0x270 net/socket.c:2685
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1154 [inline]
free_unref_page_prepare+0x7ce/0x8e0 mm/page_alloc.c:2336
free_unref_page+0x32/0x2e0 mm/page_alloc.c:2429
__slab_free+0x35e/0x410 mm/slub.c:3722
qlink_free mm/kasan/quarantine.c:166 [inline]
qlist_free_all+0x75/0xe0 mm/kasan/quarantine.c:185
kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:305
kasan_slab_alloc include/linux/kasan.h:188 [inline]
slab_post_alloc_hook+0x6e/0x4d0 mm/slab.h:767
slab_alloc_node mm/slub.c:3485 [inline]
slab_alloc mm/slub.c:3493 [inline]
__kmem_cache_alloc_lru mm/slub.c:3500 [inline]
kmem_cache_alloc+0x11e/0x2e0 mm/slub.c:3509
getname_flags+0xbb/0x500 fs/namei.c:140
user_path_at_empty+0x2c/0x60 fs/namei.c:2908
user_path_at include/linux/namei.h:57 [inline]
ksys_umount fs/namespace.c:1912 [inline]
__do_sys_umount fs/namespace.c:1920 [inline]
__se_sys_umount fs/namespace.c:1918 [inline]
__x64_sys_umount+0xf5/0x170 fs/namespace.c:1918
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Memory state around the buggy address:
ffff88805e5e5b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88805e5e5c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88805e5e5c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88805e5e5d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88805e5e5d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
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If the report is a duplicate of another one, reply with:
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If you want to undo deduplication, reply with:
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syzbot found the following issue on:
HEAD commit: cc1a1c5b404a Linux 6.6.103
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=102c3c62580000
kernel config: https://syzkaller.appspot.com/x/.config?x=412020841cf033b0
dashboard link: https://syzkaller.appspot.com/bug?extid=d1b064a9c8637489ebe5
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/46c06862a545/disk-cc1a1c5b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/38ddabb6fc8b/vmlinux-cc1a1c5b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b130b7d031b5/bzImage-cc1a1c5b.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d1b064...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-use-after-free in xfrm_state_lookup_spi_proto net/xfrm/xfrm_state.c:1477 [inline]
BUG: KASAN: slab-use-after-free in xfrm_alloc_spi+0x598/0x11f0 net/xfrm/xfrm_state.c:2302
Read of size 4 at addr ffff88805e5e5ca0 by task syz.3.3616/14521
CPU: 1 PID: 14521 Comm: syz.3.3616 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
<TASK>
dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:364 [inline]
print_report+0xac/0x220 mm/kasan/report.c:468
kasan_report+0x117/0x150 mm/kasan/report.c:581
xfrm_state_lookup_spi_proto net/xfrm/xfrm_state.c:1477 [inline]
xfrm_alloc_spi+0x598/0x11f0 net/xfrm/xfrm_state.c:2302
xfrm_alloc_userspi+0x5d1/0xa90 net/xfrm/xfrm_user.c:1623
xfrm_user_rcv_msg+0x596/0x870 net/xfrm/xfrm_user.c:3169
netlink_rcv_skb+0x216/0x480 net/netlink/af_netlink.c:2545
xfrm_netlink_rcv+0x79/0x90 net/xfrm/xfrm_user.c:3191
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x751/0x8d0 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x8c1/0xbe0 net/netlink/af_netlink.c:1894
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
____sys_sendmsg+0x5bf/0x950 net/socket.c:2595
___sys_sendmsg+0x220/0x290 net/socket.c:2649
__sys_sendmsg net/socket.c:2678 [inline]
__do_sys_sendmsg net/socket.c:2687 [inline]
__se_sys_sendmsg+0x1a5/0x270 net/socket.c:2685
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f46f138ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f46f222e038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f46f15b5fa0 RCX: 00007f46f138ebe9
RDX: 0000000000000000 RSI: 0000200000000840 RDI: 0000000000000003
RBP: 00007f46f1411e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f46f15b6038 R14: 00007f46f15b5fa0 R15: 00007fff1fba90a8
</TASK>
Allocated by task 12702:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:52
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:328
kasan_slab_alloc include/linux/kasan.h:188 [inline]
slab_post_alloc_hook+0x6e/0x4d0 mm/slab.h:767
slab_alloc_node mm/slub.c:3485 [inline]
slab_alloc mm/slub.c:3493 [inline]
__kmem_cache_alloc_lru mm/slub.c:3500 [inline]
kmem_cache_alloc+0x11e/0x2e0 mm/slub.c:3509
kmem_cache_zalloc include/linux/slab.h:711 [inline]
xfrm_state_alloc+0x22/0x2a0 net/xfrm/xfrm_state.c:661
__find_acq_core+0x7d8/0x19d0 net/xfrm/xfrm_state.c:1598
xfrm_find_acq+0x6a/0x90 net/xfrm/xfrm_state.c:2070
xfrm_alloc_userspi+0x57a/0xa90 net/xfrm/xfrm_user.c:1613
xfrm_user_rcv_msg+0x596/0x870 net/xfrm/xfrm_user.c:3169
netlink_rcv_skb+0x216/0x480 net/netlink/af_netlink.c:2545
xfrm_netlink_rcv+0x79/0x90 net/xfrm/xfrm_user.c:3191
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x751/0x8d0 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x8c1/0xbe0 net/netlink/af_netlink.c:1894
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
____sys_sendmsg+0x5bf/0x950 net/socket.c:2595
___sys_sendmsg+0x220/0x290 net/socket.c:2649
__sys_sendmsg net/socket.c:2678 [inline]
__do_sys_sendmsg net/socket.c:2687 [inline]
__se_sys_sendmsg+0x1a5/0x270 net/socket.c:2685
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
The buggy address belongs to the object at ffff88805e5e5c00
which belongs to the cache xfrm_state of size 848
The buggy address is located 160 bytes inside of
freed 848-byte region [ffff88805e5e5c00, ffff88805e5e5f50)
The buggy address belongs to the physical page:
page:ffffea0001797900 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88805e5e5c00 pfn:0x5e5e4
head:ffffea0001797900 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff88801d68b140 dead000000000122 0000000000000000
raw: ffff88805e5e5c00 0000000080100008 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x152820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 6194, tgid 6192 (syz.1.135), ts 90423707701, free_ts 90238784701
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x1cd/0x210 mm/page_alloc.c:1554
prep_new_page mm/page_alloc.c:1561 [inline]
get_page_from_freelist+0x195c/0x19f0 mm/page_alloc.c:3191
__alloc_pages+0x1e3/0x460 mm/page_alloc.c:4457
alloc_slab_page+0x5d/0x170 mm/slub.c:1876
allocate_slab mm/slub.c:2023 [inline]
new_slab+0x87/0x2e0 mm/slub.c:2076
___slab_alloc+0xc6d/0x12f0 mm/slub.c:3230
__slab_alloc mm/slub.c:3329 [inline]
__slab_alloc_node mm/slub.c:3382 [inline]
slab_alloc_node mm/slub.c:3475 [inline]
slab_alloc mm/slub.c:3493 [inline]
__kmem_cache_alloc_lru mm/slub.c:3500 [inline]
kmem_cache_alloc+0x1b7/0x2e0 mm/slub.c:3509
kmem_cache_zalloc include/linux/slab.h:711 [inline]
xfrm_state_alloc+0x22/0x2a0 net/xfrm/xfrm_state.c:661
__find_acq_core+0x7d8/0x19d0 net/xfrm/xfrm_state.c:1598
xfrm_find_acq+0x6a/0x90 net/xfrm/xfrm_state.c:2070
pfkey_getspi+0x64f/0xed0 net/key/af_key.c:1365
pfkey_process net/key/af_key.c:2847 [inline]
pfkey_sendmsg+0xbed/0x1050 net/key/af_key.c:3698
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
____sys_sendmsg+0x5bf/0x950 net/socket.c:2595
___sys_sendmsg+0x220/0x290 net/socket.c:2649
__sys_sendmsg net/socket.c:2678 [inline]
__do_sys_sendmsg net/socket.c:2687 [inline]
__se_sys_sendmsg+0x1a5/0x270 net/socket.c:2685
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1154 [inline]
free_unref_page_prepare+0x7ce/0x8e0 mm/page_alloc.c:2336
free_unref_page+0x32/0x2e0 mm/page_alloc.c:2429
__slab_free+0x35e/0x410 mm/slub.c:3722
qlink_free mm/kasan/quarantine.c:166 [inline]
qlist_free_all+0x75/0xe0 mm/kasan/quarantine.c:185
kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:305
kasan_slab_alloc include/linux/kasan.h:188 [inline]
slab_post_alloc_hook+0x6e/0x4d0 mm/slab.h:767
slab_alloc_node mm/slub.c:3485 [inline]
slab_alloc mm/slub.c:3493 [inline]
__kmem_cache_alloc_lru mm/slub.c:3500 [inline]
kmem_cache_alloc+0x11e/0x2e0 mm/slub.c:3509
getname_flags+0xbb/0x500 fs/namei.c:140
user_path_at_empty+0x2c/0x60 fs/namei.c:2908
user_path_at include/linux/namei.h:57 [inline]
ksys_umount fs/namespace.c:1912 [inline]
__do_sys_umount fs/namespace.c:1920 [inline]
__se_sys_umount fs/namespace.c:1918 [inline]
__x64_sys_umount+0xf5/0x170 fs/namespace.c:1918
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Memory state around the buggy address:
ffff88805e5e5b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88805e5e5c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88805e5e5c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88805e5e5d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88805e5e5d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot
Sep 20, 2025, 11:55:28 AM9/20/25
to syzkaller...@googlegroups.com
syzbot has found a reproducer for the following issue on:
HEAD commit: af1544b5d072 Linux 6.6.107
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=16f160e2580000
kernel config: https://syzkaller.appspot.com/x/.config?x=12606d4b8832c7e4
dashboard link: https://syzkaller.appspot.com/bug?extid=d1b064a9c8637489ebe5
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=108870e2580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16d5dc7c580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/70417990f48e/disk-af1544b5.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/1513b6e63f4f/vmlinux-af1544b5.xz
kernel image: https://storage.googleapis.com/syzbot-assets/5648a8356789/bzImage-af1544b5.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d1b064...@syzkaller.appspotmail.com
netlink: 452 bytes leftover after parsing attributes in process `syz.0.18'.
CPU: 0 PID: 5952 Comm: syz.0.18 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0033:0x7f5459b8ec29
RAX: ffffffffffffffda RBX: 00007f5459dd5fa0 RCX: 00007f5459b8ec29
RDX: 0000000000000000 RSI: 0000200000000340 RDI: 0000000000000004
RBP: 00007f5459c11e41 R08: 0000000000000000 R09: 0000000000000000
</TASK>
Allocated by task 5951:
slab_alloc mm/slub.c:3503 [inline]
__kmem_cache_alloc_lru mm/slub.c:3510 [inline]
kmem_cache_alloc+0x11e/0x2e0 mm/slub.c:3519
____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:236
kasan_slab_free include/linux/kasan.h:164 [inline]
slab_free_hook mm/slub.c:1811 [inline]
slab_free_freelist_hook+0x130/0x1b0 mm/slub.c:1837
slab_free mm/slub.c:3830 [inline]
kmem_cache_free+0xf8/0x280 mm/slub.c:3852
xfrm_state_gc_task+0x10a/0x160 net/xfrm/xfrm_state.c:562
process_one_work kernel/workqueue.c:2634 [inline]
process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
The buggy address belongs to the object at ffff88805f8c4000
The buggy address belongs to the physical page:
page:ffffea00017e3100 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5f8c4
head:ffffea00017e3100 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
allocate_slab mm/slub.c:2028 [inline]
new_slab+0x87/0x2e0 mm/slub.c:2081
___slab_alloc+0xc6d/0x1300 mm/slub.c:3253
__slab_alloc mm/slub.c:3339 [inline]
__slab_alloc_node mm/slub.c:3392 [inline]
slab_alloc_node mm/slub.c:3485 [inline]
slab_alloc mm/slub.c:3503 [inline]
__kmem_cache_alloc_lru mm/slub.c:3510 [inline]
kmem_cache_alloc+0x1b7/0x2e0 mm/slub.c:3519
kcov_put kernel/kcov.c:438 [inline]
kcov_close+0x2b/0x50 kernel/kcov.c:534
__fput+0x234/0x970 fs/file_table.c:384
task_work_run+0x1ce/0x250 kernel/task_work.c:239
exit_task_work include/linux/task_work.h:43 [inline]
do_exit+0x90b/0x23c0 kernel/exit.c:883
do_group_exit+0x21b/0x2d0 kernel/exit.c:1024
get_signal+0x12fc/0x1400 kernel/signal.c:2902
arch_do_signal_or_restart+0x96/0x780 arch/x86/kernel/signal.c:310
exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xf6/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87
ffff88805f8c4000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88805f8c4080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88805f8c4100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88805f8c4180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
HEAD commit: af1544b5d072 Linux 6.6.107
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=16f160e2580000
kernel config: https://syzkaller.appspot.com/x/.config?x=12606d4b8832c7e4
dashboard link: https://syzkaller.appspot.com/bug?extid=d1b064a9c8637489ebe5
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=108870e2580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16d5dc7c580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/70417990f48e/disk-af1544b5.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/1513b6e63f4f/vmlinux-af1544b5.xz
kernel image: https://storage.googleapis.com/syzbot-assets/5648a8356789/bzImage-af1544b5.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d1b064...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-use-after-free in xfrm_state_lookup_spi_proto net/xfrm/xfrm_state.c:1477 [inline]
BUG: KASAN: slab-use-after-free in xfrm_alloc_spi+0x598/0x11f0 net/xfrm/xfrm_state.c:2302
Read of size 4 at addr ffff88805f8c40a0 by task syz.0.18/5952
BUG: KASAN: slab-use-after-free in xfrm_state_lookup_spi_proto net/xfrm/xfrm_state.c:1477 [inline]
BUG: KASAN: slab-use-after-free in xfrm_alloc_spi+0x598/0x11f0 net/xfrm/xfrm_state.c:2302
CPU: 0 PID: 5952 Comm: syz.0.18 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffeac75dbb8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f5459dd5fa0 RCX: 00007f5459b8ec29
RDX: 0000000000000000 RSI: 0000200000000340 RDI: 0000000000000004
RBP: 00007f5459c11e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5459dd5fa0 R14: 00007f5459dd5fa0 R15: 0000000000000003
</TASK>
Allocated by task 5951:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:52
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:328
kasan_slab_alloc include/linux/kasan.h:188 [inline]
slab_post_alloc_hook+0x6e/0x4d0 mm/slab.h:767
slab_alloc_node mm/slub.c:3495 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:52
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:328
kasan_slab_alloc include/linux/kasan.h:188 [inline]
slab_post_alloc_hook+0x6e/0x4d0 mm/slab.h:767
slab_alloc mm/slub.c:3503 [inline]
__kmem_cache_alloc_lru mm/slub.c:3510 [inline]
kmem_cache_alloc+0x11e/0x2e0 mm/slub.c:3519
kmem_cache_zalloc include/linux/slab.h:711 [inline]
xfrm_state_alloc+0x22/0x2a0 net/xfrm/xfrm_state.c:661
__find_acq_core+0x7d8/0x19d0 net/xfrm/xfrm_state.c:1598
xfrm_find_acq+0x6a/0x90 net/xfrm/xfrm_state.c:2070
xfrm_alloc_userspi+0x57a/0xa90 net/xfrm/xfrm_user.c:1613
xfrm_user_rcv_msg+0x596/0x870 net/xfrm/xfrm_user.c:3169
netlink_rcv_skb+0x216/0x480 net/netlink/af_netlink.c:2545
xfrm_netlink_rcv+0x79/0x90 net/xfrm/xfrm_user.c:3191
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x751/0x8d0 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x8c1/0xbe0 net/netlink/af_netlink.c:1894
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
____sys_sendmsg+0x5bf/0x950 net/socket.c:2595
___sys_sendmsg+0x220/0x290 net/socket.c:2649
__sys_sendmsg net/socket.c:2678 [inline]
__do_sys_sendmsg net/socket.c:2687 [inline]
__se_sys_sendmsg+0x1a5/0x270 net/socket.c:2685
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Freed by task 8:
xfrm_state_alloc+0x22/0x2a0 net/xfrm/xfrm_state.c:661
__find_acq_core+0x7d8/0x19d0 net/xfrm/xfrm_state.c:1598
xfrm_find_acq+0x6a/0x90 net/xfrm/xfrm_state.c:2070
xfrm_alloc_userspi+0x57a/0xa90 net/xfrm/xfrm_user.c:1613
xfrm_user_rcv_msg+0x596/0x870 net/xfrm/xfrm_user.c:3169
netlink_rcv_skb+0x216/0x480 net/netlink/af_netlink.c:2545
xfrm_netlink_rcv+0x79/0x90 net/xfrm/xfrm_user.c:3191
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x751/0x8d0 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x8c1/0xbe0 net/netlink/af_netlink.c:1894
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
____sys_sendmsg+0x5bf/0x950 net/socket.c:2595
___sys_sendmsg+0x220/0x290 net/socket.c:2649
__sys_sendmsg net/socket.c:2678 [inline]
__do_sys_sendmsg net/socket.c:2687 [inline]
__se_sys_sendmsg+0x1a5/0x270 net/socket.c:2685
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:52
kasan_save_free_info+0x2e/0x50 mm/kasan/generic.c:522
kasan_set_track+0x4e/0x70 mm/kasan/common.c:52
____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:236
kasan_slab_free include/linux/kasan.h:164 [inline]
slab_free_hook mm/slub.c:1811 [inline]
slab_free_freelist_hook+0x130/0x1b0 mm/slub.c:1837
slab_free mm/slub.c:3830 [inline]
kmem_cache_free+0xf8/0x280 mm/slub.c:3852
xfrm_state_gc_task+0x10a/0x160 net/xfrm/xfrm_state.c:562
process_one_work kernel/workqueue.c:2634 [inline]
process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
The buggy address belongs to the object at ffff88805f8c4000
which belongs to the cache xfrm_state of size 848
The buggy address is located 160 bytes inside of
freed 848-byte region [ffff88805f8c4000, ffff88805f8c4350)
The buggy address is located 160 bytes inside of
The buggy address belongs to the physical page:
head:ffffea00017e3100 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff88823bc26000 dead000000000122 0000000000000000
page_type: 0xffffffff()
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x152820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 5951, tgid 5951 (syz.0.17), ts 96186357055, free_ts 89091661124
page_owner tracks the page as allocated
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x1cd/0x210 mm/page_alloc.c:1554
prep_new_page mm/page_alloc.c:1561 [inline]
get_page_from_freelist+0x195c/0x19f0 mm/page_alloc.c:3191
__alloc_pages+0x1e3/0x460 mm/page_alloc.c:4457
alloc_slab_page+0x5d/0x170 mm/slub.c:1881
post_alloc_hook+0x1cd/0x210 mm/page_alloc.c:1554
prep_new_page mm/page_alloc.c:1561 [inline]
get_page_from_freelist+0x195c/0x19f0 mm/page_alloc.c:3191
__alloc_pages+0x1e3/0x460 mm/page_alloc.c:4457
allocate_slab mm/slub.c:2028 [inline]
new_slab+0x87/0x2e0 mm/slub.c:2081
___slab_alloc+0xc6d/0x1300 mm/slub.c:3253
__slab_alloc mm/slub.c:3339 [inline]
__slab_alloc_node mm/slub.c:3392 [inline]
slab_alloc_node mm/slub.c:3485 [inline]
slab_alloc mm/slub.c:3503 [inline]
__kmem_cache_alloc_lru mm/slub.c:3510 [inline]
kmem_cache_alloc+0x1b7/0x2e0 mm/slub.c:3519
kmem_cache_zalloc include/linux/slab.h:711 [inline]
xfrm_state_alloc+0x22/0x2a0 net/xfrm/xfrm_state.c:661
__find_acq_core+0x7d8/0x19d0 net/xfrm/xfrm_state.c:1598
xfrm_find_acq+0x6a/0x90 net/xfrm/xfrm_state.c:2070
xfrm_alloc_userspi+0x57a/0xa90 net/xfrm/xfrm_user.c:1613
xfrm_user_rcv_msg+0x596/0x870 net/xfrm/xfrm_user.c:3169
netlink_rcv_skb+0x216/0x480 net/netlink/af_netlink.c:2545
xfrm_netlink_rcv+0x79/0x90 net/xfrm/xfrm_user.c:3191
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x751/0x8d0 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x8c1/0xbe0 net/netlink/af_netlink.c:1894
xfrm_state_alloc+0x22/0x2a0 net/xfrm/xfrm_state.c:661
__find_acq_core+0x7d8/0x19d0 net/xfrm/xfrm_state.c:1598
xfrm_find_acq+0x6a/0x90 net/xfrm/xfrm_state.c:2070
xfrm_alloc_userspi+0x57a/0xa90 net/xfrm/xfrm_user.c:1613
xfrm_user_rcv_msg+0x596/0x870 net/xfrm/xfrm_user.c:3169
netlink_rcv_skb+0x216/0x480 net/netlink/af_netlink.c:2545
xfrm_netlink_rcv+0x79/0x90 net/xfrm/xfrm_user.c:3191
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x751/0x8d0 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x8c1/0xbe0 net/netlink/af_netlink.c:1894
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1154 [inline]
free_unref_page_prepare+0x7ce/0x8e0 mm/page_alloc.c:2336
free_unref_page+0x32/0x2e0 mm/page_alloc.c:2429
vfree+0x1a6/0x320 mm/vmalloc.c:2868
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1154 [inline]
free_unref_page_prepare+0x7ce/0x8e0 mm/page_alloc.c:2336
free_unref_page+0x32/0x2e0 mm/page_alloc.c:2429
kcov_put kernel/kcov.c:438 [inline]
kcov_close+0x2b/0x50 kernel/kcov.c:534
__fput+0x234/0x970 fs/file_table.c:384
task_work_run+0x1ce/0x250 kernel/task_work.c:239
exit_task_work include/linux/task_work.h:43 [inline]
do_exit+0x90b/0x23c0 kernel/exit.c:883
do_group_exit+0x21b/0x2d0 kernel/exit.c:1024
get_signal+0x12fc/0x1400 kernel/signal.c:2902
arch_do_signal_or_restart+0x96/0x780 arch/x86/kernel/signal.c:310
exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xf6/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Memory state around the buggy address:
ffff88805f8c3f80: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
Memory state around the buggy address:
ffff88805f8c4000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88805f8c4080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88805f8c4100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88805f8c4180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
syzbot
Nov 10, 2025, 8:55:05 AM11/10/25
to syzkaller...@googlegroups.com
syzbot suspects this issue was fixed by commit:
commit 0baf92d0b1590b903c1f4ead75e61715e50e8146
Author: Sabrina Dubroca <s...@queasysnail.net>
Date: Fri Aug 29 08:54:15 2025 +0000
xfrm: xfrm_alloc_spi shouldn't use 0 as SPI
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=13e61a92580000
start commit: af1544b5d072 Linux 6.6.107
git tree: linux-6.6.y
#syz fix: xfrm: xfrm_alloc_spi shouldn't use 0 as SPI
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
commit 0baf92d0b1590b903c1f4ead75e61715e50e8146
Author: Sabrina Dubroca <s...@queasysnail.net>
Date: Fri Aug 29 08:54:15 2025 +0000
xfrm: xfrm_alloc_spi shouldn't use 0 as SPI
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=13e61a92580000
start commit: af1544b5d072 Linux 6.6.107
git tree: linux-6.6.y
kernel config: https://syzkaller.appspot.com/x/.config?x=12606d4b8832c7e4
dashboard link: https://syzkaller.appspot.com/bug?extid=d1b064a9c8637489ebe5
dashboard link: https://syzkaller.appspot.com/bug?extid=d1b064a9c8637489ebe5
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=108870e2580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16d5dc7c580000
If the result looks correct, please mark the issue as fixed by replying with:
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16d5dc7c580000
#syz fix: xfrm: xfrm_alloc_spi shouldn't use 0 as SPI
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
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