SB20260912108 - Race condition in Linux kernel nfsd

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-89681)

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:L/VI:N/VA:L/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to leak layout stateids.

The vulnerability exists due to a race condition in the nfsd layout fence worker when a layout manager breaker timeout occurs while a fence worker is running. A remote attacker can trigger concurrent layout fence operations to leak layout stateids.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/8580571227451384399b3fa53fcde19848c48e5a
• https://git.kernel.org/stable/c/a278d361e0e8f242211891193d56483a7a9f47a8