CVE-2025-71142

A kernel warning was found in the Linux kernel's cpuset cgroup implementation. When a CPU is offlined and this causes subpartitions_cpus to be cleared (no CPUs available for top_cpuset), subsequently disabling a remote partition triggers a spurious warning in remote_partition_disable(). The warning incorrectly fires because effective_xcpus is not a subset of the now-empty subpartitions_cpus.

This issue affects systems using cpuset cgroup partitions combined with CPU hotplug operations. The specific sequence requires creating exclusive CPU partitions, offlining a CPU that affects partition validity, and then changing the partition type. The result is a kernel warning in the log, but no crash or data corruption occurs. Root privileges are required to modify cgroup configurations.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.