SB20260720167 - Race condition in Linux kernel afs

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-64057)

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

CVSSv4: 6.8 [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]

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

The vulnerability exists due to improper locking in afs_get_link() and AFS symbolic link handling when processing symbolic link access and validation. A local user can trigger concurrent symbolic link operations to cause a denial of service.

The issue involves races between multiple get_link() calls, missing RCU barriering during RCU pathwalk, and concurrent updates to symlink contents from server-side changes.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/77ea917cbed62882a33114b1e23ededb977e4287
• https://git.kernel.org/stable/c/c0410adf3da6db46f3513411fcf95e63c2f1d1ad