SB20260508117 - Improper control of a resource through its lifetime in Linux kernel sched

Description

This security bulletin contains information about 1 vulnerability.

1) Improper control of a resource through its lifetime (CVE-ID: CVE-2026-43417)

CWE-ID: CWE-664 - Improper control of a resource through its lifetime

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 state management in the sched/mmcid logic when scheduling in a vfork() or CLONE_VM task. A local user can trigger the affected scheduling path to cause a denial of service.

The issue occurs when CID fixup does not correctly handle the task list and a subsequent schedule-in fails to acquire a transitional CID, causing the machine to stall.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/28b5a1395036d6c7a6c8034d85ad3d7d365f192c
• https://git.kernel.org/stable/c/e6761cdce78a8919a537989afb6aaf6881469f83