{
  "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-2025-40297",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2025-40297",
    "idYear": 2025,
    "status": "PUBLISHED",
    "publishedAt": "2025-12-08T00:46:21.112Z",
    "updatedAt": "2026-10-15T22:02:42.947Z",
    "importedAt": "2026-10-24T01:57:34.152Z",
    "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": "net: bridge: fix use-after-free due to MST port state bypass",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bridge: fix use-after-free due to MST port state bypass\n\nsyzbot reported[1] a use-after-free when deleting an expired fdb. It is\ndue to a race condition between learning still happening and a port being\ndeleted, after all its fdbs have been flushed. The port's state has been\ntoggled to disabled so no learning should happen at that time, but if we\nhave MST enabled, it will bypass the port's state, that together with VLAN\nfiltering disabled can lead to fdb learning at a time when it shouldn't\nhappen while the port is being deleted. VLAN filtering must be disabled\nbecause we flush the port VLANs when it's being deleted which will stop\nlearning. This fix adds a check for the port's vlan group which is\ninitialized to NULL when the port is getting deleted, that avoids the port\nstate bypass. When MST is enabled there would be a minimal new overhead\nin the fast-path because the port's vlan group pointer is cache-hot.\n\n[1] https://syzkaller.appspot.com/bug?extid=dd280197f0f7ab3917be",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "ec7328b59176227216c461601c6bd0e922232a9b",
              "status": "affected",
              "versionType": "git",
              "lessThan": "e19085b2a86addccff33ab8536fc67ebd9d52198"
            },
            {
              "version": "ec7328b59176227216c461601c6bd0e922232a9b",
              "status": "affected",
              "versionType": "git",
              "lessThan": "3b60ce334c1ce8b3fad7e02dcd5ed9f6646477c8"
            },
            {
              "version": "ec7328b59176227216c461601c6bd0e922232a9b",
              "status": "affected",
              "versionType": "git",
              "lessThan": "bf3843183bc3158e5821b46f330c438ae9bd6ddb"
            },
            {
              "version": "ec7328b59176227216c461601c6bd0e922232a9b",
              "status": "affected",
              "versionType": "git",
              "lessThan": "991fbe1680cd41a5f97c92cd3a3496315df36e4b"
            },
            {
              "version": "ec7328b59176227216c461601c6bd0e922232a9b",
              "status": "affected",
              "versionType": "git",
              "lessThan": "8dca36978aa80bab9d4da130c211db75c9e00048"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "5.18",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "5.18"
            },
            {
              "version": "6.1.159",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.117",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.58",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.17.8",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.17.*"
            },
            {
              "version": "6.18",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}