Announcing new releases Alpha 4459.0.0, Beta 4426.1.0, Stable 4230.2.3, LTS 4081.3.6

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Flatcar Container Linux User

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Sep 16, 2025, 4:48:23 AMSep 16
to Flatcar Container Linux User

Hello,

We are pleased to announce a new Flatcar Container Linux release for the Alpha, Beta, Stable, LTS channels.

Alpha 4459.0.0

Changes since Alpha 4426.0.0

Security fixes: Bug fixes:
  • Enabled CONFIG_CPUSETS_V1 to mitigate cgroupsv1 removal (e.g JVM) (Flatcar#1884)
Changes:
  • Enable CONFIG_INET_DIAG_DESTROY in kernel options (flatcar/scripts#3176)
  • Hyper-V images now use a systemd-sysext image for layering additional platform-specific software on top of /usr
Updates: Beta 4426.1.0

Changes since Beta 4372.1.0

Security fixes: Bug fixes:
  • Enabled CONFIG_CPUSETS_V1 to mitigate cgroupsv1 removal (e.g JVM) (Flatcar#1884)
  • Fixed a UID/GID mis-alignment for user/group messagebus between acct-user/acct-group and baselayout. (baselayout#36)
  • Reenabled console support for DRM drivers, so that with the virtio graphics driver the interactive console is shown again after boot (Flatcar#1834)
  • sysext-podman: removed /etc/subuid and /etc/subgid generation for core user, before this change it partially overwrites the file and causes issues. (Flatcar#1733) This could be created through initial provisioning. (scripts#3043)
Changes: Updates:

Changes since Alpha 4426.0.0

Security fixes: Bug fixes:
  • Enabled CONFIG_CPUSETS_V1 to mitigate cgroupsv1 removal (e.g JVM) (Flatcar#1884)
Updates: Stable 4230.2.3

Changes since Stable 4230.2.2

Security fixes: Updates:
LTS 4081.3.6

Changes since LTS 4081.3.5

Security fixes: Updates:

Best,

The Flatcar Container Linux Maintainers



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