SB20260626163 - Always-Incorrect Control Flow Implementation in Linux kernel time

Description

This security bulletin contains information about 1 vulnerability.

1) Always-Incorrect Control Flow Implementation (CVE-ID: CVE-2026-53180)

CWE-ID: CWE-670 - Always-Incorrect Control Flow Implementation

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper handling of expired timers in tmigr_handle_remote_cpu() in timer migration code when processing remote timer expiry handling. A local user can trigger the affected timer handling path to cause a denial of service.

The issue can cause an indefinite spin in the goto-again loop after an expired timer callback is never invoked and the timer remains reported as expired.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/07b3b83587fb3012619f4439389b64a955fc7836
• https://git.kernel.org/stable/c/1d6c2062b77be09ec15d6bf637b2e2221c4482fc
• https://git.kernel.org/stable/c/d338e61ea94052a786aac9f58e9f0d8520afa0fd
• https://git.kernel.org/stable/c/d486b4934a8e504376b85cdb3766f306d57aff5b