Trying to understand Syzkaller

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Sai

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Oct 9, 2025, 1:50:15 PM (10 days ago) Oct 9

to syzkaller

Hi guys,

I am new to fuzzing, and I am exploring Syzkaller. I went through some of the articles on the internet to understand the internals of Syzkaller. Some of them mention "syz-fuzzer" process which runs in each VM and mutates the test sequence. But when I went on to look at the source code/ architecture diagram in git repo, there is no mention of "syz-fuzzer". So did syzkaller evolve and merge the functionality of syz-fuzzer into syz-manager or those articles on the internet wrong?

Aleksandr Nogikh

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Oct 9, 2025, 1:51:36 PM (10 days ago) Oct 9

to Sai, syzkaller

On Thu, Oct 9, 2025 at 7:50 PM Sai <ravind...@gmail.com> wrote:

Hi guys,

I am new to fuzzing, and I am exploring Syzkaller. I went through some of the articles on the internet to understand the internals of Syzkaller. Some of them mention "syz-fuzzer" process which runs in each VM and mutates the test sequence. But when I went on to look at the source code/ architecture diagram in git repo, there is no mention of "syz-fuzzer". So did syzkaller evolve and merge the functionality of syz-fuzzer into syz-manager or those articles on the internet wrong?

Hi,

Yes, syzkaller has evolved since then. The syz-fuzzer functionality has indeed become a part of syz-manager.