Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: mm: mglru: fix stale batch updates after memcg reparenting The mglru page table… (CVE-2026-80719)

The Linux kernel's mglru page table walker batches per-generation size deltas in walk->nr_pages without holding the lruvec lock, and later folds these deltas under the lock. Concurrent execution with memcg reparenting can cause stale batch updates, leading to undercounted nr_pages. This undercount causes MGLRU to prematurely trigger OOM conditions since it believes no reclaimable pages remain. The fix adds a check for CSS_DYING under RCU in reset_batch_size() to redirect deltas to a stable ancestor memcg, preventing stale updates and ensuring correct page accounting.

The vulnerability causes premature out-of-memory (OOM) conditions due to underestimated page counts in the MGLRU memory management subsystem. This can lead to unnecessary memory pressure and potential application or system instability. There is no indication of privilege escalation, data corruption, or remote code execution.

No vendor advisory or patch information is provided in the input data. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is applied, be aware of potential premature OOM conditions related to memory control group reparenting in affected Linux kernel versions.