Race condition in Linux kernel - CVE-2026-89521
Published: September 12, 2026
Vulnerability identifier: #VU149289
CSH Severity: Low
CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89521
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause scheduler selection and accounting inconsistencies.
The vulnerability exists due to a race condition in the core scheduler's pick_next_task() function when handling task selection after pick_task() releases the runqueue lock. A local user can trigger task selection that interleaves with another selection to cause scheduler selection and accounting inconsistencies.
Affected software
Linux kernel
How to mitigate CVE-2026-89521
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3