CVE-2026-31456

A flaw was found in the Linux kernel. A race condition in the memory management subsystem, specifically when handling page table entries, can be triggered by a local user. This can lead to a kernel bug, causing a system crash and resulting in a denial of service.

Upstream synchronized PUD walking with pudp_get() snapshots so concurrent split/refault cannot descend into torn down middle levels (scenario involved VFIO BAR pinning vs /proc numa_maps reads). Red Hat concurs this is a local availability bug in the VM walk infrastructure. Consume patched kernels; there is no clean module-level mitigation for core MM.

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.