SB20260912266 - Race condition in Linux kernel sched

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-89520)

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 cause a denial of service.

The vulnerability exists due to a race condition in core scheduling's pick_next_task() when a core scheduling flip occurs while a lock-dropping pick_task() operation is in progress. A local user can trigger concurrent core scheduling flips and task selections to cause a denial of service.

Only systems using core scheduling are affected.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/23eda24f325a6e6d686d30ec75f2e9d6745e2015
• https://git.kernel.org/stable/c/9d69422ddaa13526c2223444e237d948d6e44728
• https://git.kernel.org/stable/c/f3629c63a4af3e491381780bc6c123cb498c4c40