CVE-2026-53153

Technical Description

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

mm/list_lru: drain before clearing xarray entry on reparent

memcg_reparent_list_lrus() clears the dying memcg's xarray entry with

xas_store(&xas, NULL) before reparenting its per-node lists into the

parent. This opens a window where a concurrent list_lru_del() arriving

for the dying memcg sees xa_load() == NULL, walks to the parent in

lock_list_lru_of_memcg(), takes the parent's per-node lock, and calls

list_del_init() on an item still physically linked on the dying memcg's

list.

If another in-flight thread holds the dying memcg's per-node lock at the

same moment (another list_lru_del, or a list_lru_walk_one running an

isolate callback), both threads modify ->next/->prev pointers on the same

physical list under different locks. Adjacent items can corrupt each

other's links.

Fix it by reversing the order: reparent each per-node list and mark the

child's list lru dead and then clear the xarray entry. Any concurren

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. 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.

Affected Products

References