Race condition in Linux kernel - CVE-2026-89519
Published: September 12, 2026
Vulnerability identifier: #VU149287
CSH Severity: Low
CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89519
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause incorrect task scheduling.
The vulnerability exists due to a race condition in the sched_ext dispatch and task-selection logic when scheduler selections interleave through dispatch lock drops. A local user can trigger interleaved scheduler dispatches and task selections to cause incorrect task scheduling.
A task that has been dequeued can be incorrectly retained as the previous task because a stale runqueue-level decision is consumed by a later selection.
Affected software
Linux kernel
How to mitigate CVE-2026-89519
Install security update from vendor's repository.