memcg: make the v1 soft limit knob inert

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-93240
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-24 16:17:19 UTC
Updated2026-09-25 13:17:18 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: memcg: make the v1 soft limit knob inert The v1 soft limit has been deprecated since v6.12 and nobody has reported depending on it. Start the removal by decoupling the interface from the implementation: keep memory.soft_limit_in_bytes, but ignore writes to it and always report the maximum value on read similar to what memory.kmem.limit_in_bytes already does. Writes are still parsed, so malformed input keeps returning -EINVAL. The knob now also behaves the same everywhere: it used to return -EOPNOTSUPP on PREEMPT_RT, where soft limit reclaim has always been disabled. This also fixes the syzbot report linked below. Soft limit reclaim is the only caller that runs shrink_lruvec() from kswapd against a specific memcg, so it is the only way to reach lru_gen_shrink_lruvec() and in turn set_mm_walk(), which warns when called from kswapd.

Risk And Classification

EPSS: 0.002180000 probability, percentile 0.110230000 (date 2026-09-27)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected e9d4e1ee788097484606c32122f146d802a9c5fb 72fb67f6e0e5d78e4f34cf9929d1afdb0fd54203 git Not specified
CNA Linux Linux affected e9d4e1ee788097484606c32122f146d802a9c5fb 0a90e268cce7023f34087bfa4affb42e29ff5f45 git Not specified
CNA Linux Linux affected e9d4e1ee788097484606c32122f146d802a9c5fb 5ec8f629a300cc40e746d6178f724bdff7683fa7 git Not specified
CNA Linux Linux affected e9d4e1ee788097484606c32122f146d802a9c5fb a3417097fb107cea3358b19bcbb4eb655fd67f8c git Not specified
CNA Linux Linux affected 6.3 Not specified
CNA Linux Linux unaffected 6.3 semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.51 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.5 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a3417097fb107cea3358b19bcbb4eb655fd67f8c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0a90e268cce7023f34087bfa4affb42e29ff5f45 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/72fb67f6e0e5d78e4f34cf9929d1afdb0fd54203 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5ec8f629a300cc40e746d6178f724bdff7683fa7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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