SB2026090621 - Race condition in Linux kernel afs

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-80885)

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

CVSSv4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to trigger processing of out-of-band messages after a network namespace is no longer live.

The vulnerability exists due to improper synchronization in the AFS RxRPC out-of-band message handler when processing queued RxRPC out-of-band messages during network namespace teardown. A remote attacker can send an RxRPC out-of-band message to trigger processing after the namespace is no longer live.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/231414253b648b3518b56f09710b831945d6a2fc
• https://git.kernel.org/stable/c/a4057e58b07005d0fe0491bdbf1868c1491909ee
• https://git.kernel.org/stable/c/d14e96ddd616c8a9fff3b5bab3bf4af0cfc30ec4