SB20260917138 - Race condition in Linux kernel f2fs

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-89831)

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

CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

The vulnerability allows a local user to interfere with checkpoint or garbage-collection thread scheduling state.

The vulnerability exists due to a race condition in the f2fs critical_task_priority sysfs store path when writing the critical_task_priority sysfs attribute during filesystem remount or teardown. A local user can perform a concurrent sysfs write to interfere with checkpoint or garbage-collection thread scheduling state.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/8e4692c6c165e81b2cbb847d8da4b45a53483b33
• https://git.kernel.org/stable/c/bee6dfcc111b1dffdb3e13d73b7028b699fa0165