Race condition in Linux kernel - CVE-2026-89831
Published: September 17, 2026
Vulnerability identifier: #VU150460
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-89831
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Linux kernel
How to mitigate CVE-2026-89831
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3