mm/list_lru: drain before clearing xarray entry on reparent

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Summary

CVECVE-2026-53153
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-25 09:16:32 UTC
Updated2026-06-25 09:16:32 UTC
DescriptionIn 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 concurrent list_lru op that finds the still-set xarray entry either takes the dying memcg's per-node lock (synchronizing with the drain) or sees LONG_MIN and walks to the parent, where the items now live.

Risk And Classification

EPSS: 0.001730000 probability, percentile 0.069780000 (date 2026-06-25)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected fb56fdf8b9a2f7397f8a83dce50189f3f0cf71af c19ff4351214f059349788e13e70e74325831ff6 git Not specified
CNA Linux Linux affected fb56fdf8b9a2f7397f8a83dce50189f3f0cf71af 2b66496d794e98f7aeec7688573051f22ec40bac git Not specified
CNA Linux Linux affected fb56fdf8b9a2f7397f8a83dce50189f3f0cf71af 98733f3f0becb1ae0701d021c1748e974e5fa55c git Not specified
CNA Linux Linux affected 6.13 Not specified
CNA Linux Linux unaffected 6.13 semver Not specified
CNA Linux Linux unaffected 6.18.36 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.13 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/98733f3f0becb1ae0701d021c1748e974e5fa55c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2b66496d794e98f7aeec7688573051f22ec40bac 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c19ff4351214f059349788e13e70e74325831ff6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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