SB20260815246 - Use-after-free in Linux kernel NFS file lock list handling code

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-72472)

CWE-ID: CWE-416 - Use After Free

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 a use-after-free in the NFS file lock list handling code when traversing file locks during lock reclaim and delegation lock processing. A local user can trigger concurrent lock and unlock operations to cause a denial of service.

The issue affects NFS lock recovery and delegation-related paths, including reclaim and delegation recall handling.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/1cda95bf2e9c0e6b63545b7565fe4a1e474322f4
• https://git.kernel.org/stable/c/4837fb36219e6c08b666bc31a86841bad8526358
• https://git.kernel.org/stable/c/e68035178e65e2b3aa386ce61202ff33724ae418
• https://git.kernel.org/stable/c/f161ef7b0dd2f51fdb002ba4a4e9bf0ee7409218