{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2026-90326",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-90326",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-09-17T16:08:41.374Z",
    "updatedAt": "2026-10-21T12:51:00.266Z",
    "importedAt": "2026-10-24T01:58:35.090Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "blk-cgroup: fix race between policy activation and blkg destruction",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nblk-cgroup: fix race between policy activation and blkg destruction\n\nWhen switching an IO scheduler on a block device, blkcg_activate_policy()\nallocates blkg_policy_data (pd) for all blkgs attached to the queue.\nHowever, blkcg_activate_policy() may race with concurrent blkcg deletion,\nleading to use-after-free and memory leak issues.\n\nThe use-after-free occurs in the following race:\n\nT1 (blkcg_activate_policy):\n  - Successfully allocates pd for blkg1 (loop0->queue, blkcgA)\n  - Fails to allocate pd for blkg2 (loop0->queue, blkcgB)\n  - Enters the enomem rollback path to release blkg1 resources\n\nT2 (blkcg deletion):\n  - blkcgA is deleted concurrently\n  - blkg1 is freed via blkg_free_workfn()\n  - blkg1->pd is freed\n\nT1 (continued):\n  - Rollback path accesses blkg1->pd->online after pd is freed\n  - Triggers use-after-free\n\nIn addition, blkg_free_workfn() frees pd before removing the blkg from\nq->blkg_list. This allows blkcg_activate_policy() to allocate a new pd\nfor a blkg that is being destroyed, leaving the newly allocated pd\nunreachable when the blkg is finally freed.\n\nFix these races by extending blkcg_mutex coverage to serialize\nblkcg_activate_policy() rollback and blkg destruction, ensuring pd\nlifecycle is synchronized with blkg list visibility.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "81c1188905f88b77743d1fdeeedfc8cb7b67787d",
              "status": "affected",
              "versionType": "git",
              "lessThan": "b5dae1cd0d8368b4338430ff93403df67f0b8bcc"
            },
            {
              "version": "bfe46d2efe46c5c952f982e2ca94fe2ec5e58e2a",
              "status": "affected",
              "versionType": "git",
              "lessThan": "083b58373463a6e5ee60ecb135269348f68ad7df"
            },
            {
              "version": "f1c006f1c6850c14040f8337753a63119bba39b9",
              "status": "affected",
              "versionType": "git",
              "lessThan": "17c18a0df70c2b89ff7fcd74622f1540e98d00fd"
            },
            {
              "version": "f1c006f1c6850c14040f8337753a63119bba39b9",
              "status": "affected",
              "versionType": "git",
              "lessThan": "91062e3a9ed251726df4e20ff9a1113f1c8ded59"
            },
            {
              "version": "f1c006f1c6850c14040f8337753a63119bba39b9",
              "status": "affected",
              "versionType": "git",
              "lessThan": "ac34e655dffa74349d885a43d098115336f53842"
            },
            {
              "version": "f1c006f1c6850c14040f8337753a63119bba39b9",
              "status": "affected",
              "versionType": "git",
              "lessThan": "2cf9f50a38c1839e549a08e22aa35e8d69e2c8fd"
            },
            {
              "version": "f1c006f1c6850c14040f8337753a63119bba39b9",
              "status": "affected",
              "versionType": "git",
              "lessThan": "5313d4d41739b0cb63000747c97bb1217ac45f3e"
            },
            {
              "version": "6.1.16",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "6.1.17"
            },
            {
              "version": "6.2.3",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "6.2.4"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "6.3",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "6.3"
            },
            {
              "version": "6.1.17",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.2.4",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.2.*"
            },
            {
              "version": "6.6.160",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.114",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.52",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "7.2.6",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "version": "7.3",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}