CVE-2026-93240 (GCVE-0-2026-93240)

Vulnerability from cvelistv5 – Published: 2026-09-24 15:34 – Updated: 2026-10-21 12:52
VLAI
Title
memcg: make the v1 soft limit knob inert
Summary
In 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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6843 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e9d4e1ee788097484606c32122f146d802a9c5fb , < bf75f14d755f9cfbb246e6cc011b53cdd5142de3 (git)
Affected: e9d4e1ee788097484606c32122f146d802a9c5fb , < 72fb67f6e0e5d78e4f34cf9929d1afdb0fd54203 (git)
Affected: e9d4e1ee788097484606c32122f146d802a9c5fb , < 0a90e268cce7023f34087bfa4affb42e29ff5f45 (git)
Affected: e9d4e1ee788097484606c32122f146d802a9c5fb , < 5ec8f629a300cc40e746d6178f724bdff7683fa7 (git)
Affected: e9d4e1ee788097484606c32122f146d802a9c5fb , < a3417097fb107cea3358b19bcbb4eb655fd67f8c (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.3
Unaffected: 0 , < 6.3 (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.51 , ≤ 6.18.* (semver)
Unaffected: 7.2.5 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
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      "affected": [
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          "product": "Linux",
          "programFiles": [
            "Documentation/admin-guide/cgroup-v1/memory.rst",
            "mm/memcontrol-v1.c"
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            "Documentation/admin-guide/cgroup-v1/memory.rst",
            "mm/memcontrol-v1.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "6.3"
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              "version": "6.6.160",
              "versionType": "semver"
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              "version": "6.12.110",
              "versionType": "semver"
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              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.51",
              "versionType": "semver"
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              "version": "7.2.5",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
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          "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."
        }
      ],
      "providerMetadata": {
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/a3417097fb107cea3358b19bcbb4eb655fd67f8c"
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      "title": "memcg: make the v1 soft limit knob inert",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93240",
    "datePublished": "2026-09-24T15:34:32.134Z",
    "dateReserved": "2026-09-17T16:02:15.095Z",
    "dateUpdated": "2026-10-21T12:52:27.295Z",
    "state": "PUBLISHED"
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      "initial_release_date": "2026-09-27T23:39:44.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "memcg: make the v1 soft limit knob inert",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-93240.json",
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                "programFiles": [
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            "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."
          }
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        "lastModified": "2026-10-21T13:21:05.993",
        "metrics": {},
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      "cve": "CVE-2026-93240",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: memcg: make the v1 soft limit knob inert",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93240.json",
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  }
}



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