CVE-2026-43417

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

sched/mmcid: Handle vfork()/CLONE_VM correctly

Matthieu and Jiri reported stalls where a task endlessly loops in

mm_get_cid() when scheduling in.

It turned out that the logic which handles vfork()'ed tasks is broken. It

is invoked when the number of tasks associated to a process is smaller than

the number of MMCID users. It then walks the task list to find the

vfork()'ed task, but accounts all the already processed tasks as well.

If that double processing brings the number of to be handled tasks to 0,

the walk stops and the vfork()'ed task's CID is not fixed up. As a

consequence a subsequent schedule in fails to acquire a (transitional) CID

and the machine stalls.

Cure this by removing the accounting condition and make the fixup always

walk the full task list if it could not find the exact number of users in

the process' thread list.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References