{"id":"CVE-2026-93240","state":"PUBLISHED","title":"memcg: make the v1 soft limit knob inert","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmemcg: make the v1 soft limit knob inert\n\nThe v1 soft limit has been deprecated since v6.12 and nobody has reported\ndepending on it.  Start the removal by decoupling the interface from the\nimplementation: keep memory.soft_limit_in_bytes, but ignore writes to it\nand always report the maximum value on read similar to what\nmemory.kmem.limit_in_bytes already does.\n\nWrites are still parsed, so malformed input keeps returning -EINVAL.  The\nknob now also behaves the same everywhere: it used to return -EOPNOTSUPP\non PREEMPT_RT, where soft limit reclaim has always been disabled.\n\nThis also fixes the syzbot report linked below.  Soft limit reclaim is the\nonly caller that runs shrink_lruvec() from kswapd against a specific\nmemcg, so it is the only way to reach lru_gen_shrink_lruvec() and in turn\nset_mm_walk(), which warns when called from kswapd.","publishedAt":"2026-09-24T15:34:32.134Z","updatedAt":"2026-10-21T12:52:27.295Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"e9d4e1ee788097484606c32122f146d802a9c5fb","status":"affected","lessThan":"bf75f14d755f9cfbb246e6cc011b53cdd5142de3","versionType":"git"},{"version":"e9d4e1ee788097484606c32122f146d802a9c5fb","status":"affected","lessThan":"72fb67f6e0e5d78e4f34cf9929d1afdb0fd54203","versionType":"git"},{"version":"e9d4e1ee788097484606c32122f146d802a9c5fb","status":"affected","lessThan":"0a90e268cce7023f34087bfa4affb42e29ff5f45","versionType":"git"},{"version":"e9d4e1ee788097484606c32122f146d802a9c5fb","status":"affected","lessThan":"5ec8f629a300cc40e746d6178f724bdff7683fa7","versionType":"git"},{"version":"e9d4e1ee788097484606c32122f146d802a9c5fb","status":"affected","lessThan":"a3417097fb107cea3358b19bcbb4eb655fd67f8c","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["Documentation/admin-guide/cgroup-v1/memory.rst","mm/memcontrol-v1.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.3","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.3","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.51","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.5","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["Documentation/admin-guide/cgroup-v1/memory.rst","mm/memcontrol-v1.c"]}],"references":["https://git.kernel.org/stable/c/bf75f14d755f9cfbb246e6cc011b53cdd5142de3","https://git.kernel.org/stable/c/72fb67f6e0e5d78e4f34cf9929d1afdb0fd54203","https://git.kernel.org/stable/c/0a90e268cce7023f34087bfa4affb42e29ff5f45","https://git.kernel.org/stable/c/5ec8f629a300cc40e746d6178f724bdff7683fa7","https://git.kernel.org/stable/c/a3417097fb107cea3358b19bcbb4eb655fd67f8c"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/93xxx/CVE-2026-93240.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-93240","state":"PUBLISHED","datePublished":"2026-09-24T15:34:32.134Z","dateUpdated":"2026-10-21T12:52:27.295Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-17T16:02:15.095Z"},"containers":{"cna":{"title":"memcg: make the v1 soft limit knob inert","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nmemcg: make the v1 soft limit knob inert\n\nThe v1 soft limit has been deprecated since v6.12 and nobody has reported\ndepending on it.  Start the removal by decoupling the interface from the\nimplementation: keep memory.soft_limit_in_bytes, but ignore writes to it\nand always report the maximum value on read similar to what\nmemory.kmem.limit_in_bytes already does.\n\nWrites are still parsed, so malformed input keeps returning -EINVAL.  The\nknob now also behaves the same everywhere: it used to return -EOPNOTSUPP\non PREEMPT_RT, where soft limit reclaim has always been disabled.\n\nThis also fixes the syzbot report linked below.  Soft limit reclaim is the\nonly caller that runs shrink_lruvec() from kswapd against a specific\nmemcg, so it is the only way to reach lru_gen_shrink_lruvec() and in turn\nset_mm_walk(), which warns when called from kswapd."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"e9d4e1ee788097484606c32122f146d802a9c5fb","status":"affected","lessThan":"bf75f14d755f9cfbb246e6cc011b53cdd5142de3","versionType":"git"},{"version":"e9d4e1ee788097484606c32122f146d802a9c5fb","status":"affected","lessThan":"72fb67f6e0e5d78e4f34cf9929d1afdb0fd54203","versionType":"git"},{"version":"e9d4e1ee788097484606c32122f146d802a9c5fb","status":"affected","lessThan":"0a90e268cce7023f34087bfa4affb42e29ff5f45","versionType":"git"},{"version":"e9d4e1ee788097484606c32122f146d802a9c5fb","status":"affected","lessThan":"5ec8f629a300cc40e746d6178f724bdff7683fa7","versionType":"git"},{"version":"e9d4e1ee788097484606c32122f146d802a9c5fb","status":"affected","lessThan":"a3417097fb107cea3358b19bcbb4eb655fd67f8c","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["Documentation/admin-guide/cgroup-v1/memory.rst","mm/memcontrol-v1.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.3","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.3","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.51","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.5","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["Documentation/admin-guide/cgroup-v1/memory.rst","mm/memcontrol-v1.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/bf75f14d755f9cfbb246e6cc011b53cdd5142de3"},{"url":"https://git.kernel.org/stable/c/72fb67f6e0e5d78e4f34cf9929d1afdb0fd54203"},{"url":"https://git.kernel.org/stable/c/0a90e268cce7023f34087bfa4affb42e29ff5f45"},{"url":"https://git.kernel.org/stable/c/5ec8f629a300cc40e746d6178f724bdff7683fa7"},{"url":"https://git.kernel.org/stable/c/a3417097fb107cea3358b19bcbb4eb655fd67f8c"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-21T12:52:27.295Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.3","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.3","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.3","versionEndExcluding":"6.18.51"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.3","versionEndExcluding":"7.2.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.3","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}