memcg: use round-robin victim selection in refill_stock

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Summary

CVECVE-2026-53162
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-25 09:16:33 UTC
Updated2026-06-25 09:16:33 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: memcg: use round-robin victim selection in refill_stock Harry Yoo reported that get_random_u32_below() is not safe to call in the nmi context and memcg charge draining can happen in nmi context. More specifically get_random_u32_below() is neither reentrant- nor NMI-safe: it acquires a per-cpu local_lock via local_lock_irqsave() on the batched_entropy_u32 state. An NMI that lands on a CPU mid-update of the ChaCha batch state and recurses into the random subsystem would corrupt that state. The memcg_stock local_trylock prevents re-entry on the percpu stock itself, but cannot protect an unrelated subsystem's per-cpu lock. Replace the random pick with a per-cpu round-robin counter stored in memcg_stock_pcp and serialized by the same local_trylock that already guards cached[] and nr_pages[]. No atomics, no random calls, no extra locks needed.

Risk And Classification

EPSS: 0.001730000 probability, percentile 0.069790000 (date 2026-06-25)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f735eebe55f8f61758fe014bd0b02ab50b059e4d 89bd8215e25aa6999cc51696da418e0d422bc5e0 git Not specified
CNA Linux Linux affected f735eebe55f8f61758fe014bd0b02ab50b059e4d 00731bd7e18f182a32ca54d6b176eaa470b51ed7 git Not specified
CNA Linux Linux affected f735eebe55f8f61758fe014bd0b02ab50b059e4d c0cafe24d3f6534294c4b2bc2d47734ff7cbd313 git Not specified
CNA Linux Linux affected 6.16 Not specified
CNA Linux Linux unaffected 6.16 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/89bd8215e25aa6999cc51696da418e0d422bc5e0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/00731bd7e18f182a32ca54d6b176eaa470b51ed7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c0cafe24d3f6534294c4b2bc2d47734ff7cbd313 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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