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CVE-2026-31586 mm: blk-cgroup: fix use-after-free in cgwb_release_workfn()

🗓️ 24 Apr 2026 14:42:14Reported by LinuxType 
cvelist
 cvelist
🔗 www.cve.org👁 27 Views

CVE-2026-31586 fixes a use-after-free in block cgroup caused by cgwb_release_workfn dereferencing freed blkcg after css_put.

Related
Affected
Refs
[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "mm/backing-dev.c"
    ],
    "versions": [
      {
        "version": "59b57717fff8b562825d9d25e0180ad7e8048ca9",
        "lessThan": "23acef4156c260e8598397a1a2e8b3a23e919893",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "59b57717fff8b562825d9d25e0180ad7e8048ca9",
        "lessThan": "1bd36e93b542d9dd020190c6607c6a3663405195",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "59b57717fff8b562825d9d25e0180ad7e8048ca9",
        "lessThan": "740ba1ebb223f137ff088ab74d533a13f9167bd8",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "59b57717fff8b562825d9d25e0180ad7e8048ca9",
        "lessThan": "115a5266749dcde7fe4127e8623d19c752088f69",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "59b57717fff8b562825d9d25e0180ad7e8048ca9",
        "lessThan": "dfc8292a1d6782c76b626315605e0585a5a18447",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "59b57717fff8b562825d9d25e0180ad7e8048ca9",
        "lessThan": "ea3af09eb87d8f8708c66747fcf1a2762902e839",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "59b57717fff8b562825d9d25e0180ad7e8048ca9",
        "lessThan": "50879a3c1faf06e661090015d59e2127255cff27",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "59b57717fff8b562825d9d25e0180ad7e8048ca9",
        "lessThan": "67cb119d32f35e32acd0393bbeb318b2bb1fdafe",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "59b57717fff8b562825d9d25e0180ad7e8048ca9",
        "lessThan": "8f5857be99f1ed1fa80991c72449541f634626ee",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "mm/backing-dev.c"
    ],
    "versions": [
      {
        "version": "4.19",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "4.19",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "5.10.258",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "5.15.209",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.1.175",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.6.136",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.12.83",
        "lessThanOrEqual": "6.12.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.18.24",
        "lessThanOrEqual": "6.18.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "6.19.14",
        "lessThanOrEqual": "6.19.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "7.0.1",
        "lessThanOrEqual": "7.0.*",
        "status": "unaffected",
        "versionType": "semver"
      },
      {
        "version": "7.1",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]

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14 Jun 2026 17:42Current
CVSS 3.17.8
EPSS0.00128
27