CVE-2026-80719

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description An issue exists in the Multi-Gen Least Recently Used (MGLRU) page table walker where per-generation size deltas are batched in walk->nr pages without holding the lruvec lock. When the reset batch size() function later folds these deltas into walk->lruvec under the lock, a race condition can occur if the page table walker runs concurrently with the memory control group (memcg) reparenting path. Specifically, if a memcg is offlined and child folios are reparented, the batch update may become stale. This leads to an underestimation of nr pages in MGLRU, which can cause premature Out-Of-Memory (OOM) conditions because the system may fail to reclaim memory when it believes nr pages has reached zero despite pages still being present.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.