SB20260912267 - Race condition in Linux kernel sched

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-89521)

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

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.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/88ed5a66467ca2a5148b9997af9c71d8c43060ad
• https://git.kernel.org/stable/c/c10b216a072ff5c57bc880a05f87eb519aecc529