SB2026052980 - Race condition in Linux kernel cgroup

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-46223)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper synchronization in cgroup rmdir handling when removing a cgroup while zombie reaping and pid namespace teardown are in progress. A local user can trigger cgroup removal in this state to cause a denial of service.

The issue can lead to an A-A deadlock because the reaper can block in an uninterruptible wait while the resources it is waiting on cannot be released.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/33fa2e6b1507a0a377a151a8826438bedad1d0b0
• https://git.kernel.org/stable/c/93618edf753838a727dbff63c7c291dee22d656b