CVE-2024-41932

/// Technical description

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

sched: fix warning in sched_setaffinity

Commit 8f9ea86fdf99b added some logic to sched_setaffinity that included

a WARN when a per-task affinity assignment races with a cpuset update.

Specifically, we can have a race where a cpuset update results in the

task affinity no longer being a subset of the cpuset. That's fine; we

have a fallback to instead use the cpuset mask. However, we have a WARN

set up that will trigger if the cpuset mask has no overlap at all with

the requested task affinity. This shouldn't be a warning condition; its

trivial to create this condition.

Reproduced the warning by the following setup:

- $PID inside a cpuset cgroup

- another thread repeatedly switching the cpuset cpus from 1-2 to just 1

- another thread repeatedly setting the $PID affinity (via taskset) to 2

/// 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