SB2026070734 - Race condition in Linux kernel unix

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-53361)

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

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:P/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 a race condition in unix_gc() and unix_peek_fpl() in the af_unix garbage collection logic when processing MSG_PEEK operations during garbage collection scheduling. A local user can trigger concurrent garbage collection activity to cause a denial of service.

The issue occurs because gc_in_progress may be false while unix_gc() is running, which can confuse garbage collection by MSG_PEEK.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0cfa78c050662784fc8e3ab26dbfd1dc632b2082
• https://git.kernel.org/stable/c/591f1ac217428a6d2b32a8ac14aac0fab44f155a
• https://git.kernel.org/stable/c/82c17e13d404f686e164590483fd6c1abaa675d0
• https://git.kernel.org/stable/c/d82ba05263c69fa2437fe93e4e561cc40f4c03af