{
  "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-2026-64531",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-64531",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-07-27T06:32:32.596Z",
    "updatedAt": "2026-10-19T20:48:38.436Z",
    "importedAt": "2026-10-24T01:58:25.636Z",
    "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: openvswitch: reject oversized nested action attrs",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: openvswitch: reject oversized nested action attrs\n\nOpen vSwitch stores generated flow actions as nlattrs, whose nla_len\nfield is u16. Commit a1e64addf3ff (\"net: openvswitch: remove\nmisbehaving actions length check\") allowed the total sw_flow_actions\nstream to grow beyond 64 KiB, which is valid, but also removed the last\nguard preventing a generated nested action attribute from exceeding\nU16_MAX.\n\nAn oversized generated container can thus be closed with a truncated\nnla_len. A later dump or teardown then walks a structurally different\nstream than the one that was validated. In particular, an oversized\nnested CLONE/CT action may cause subsequent bytes in the generated\nstream to be interpreted as independent actions.\n\nKeep the larger total-action-stream behavior, but make nested action\nclose reject generated containers that do not fit in nla_len, and return\nthe error through all callers. For recursive SAMPLE, CLONE, DEC_TTL, and\nCHECK_PKT_LEN builders, trim resource-owning action-list tails in reverse\nconstruction order before discarding failed wrappers, so resources copied\ninto the rejected tails are released before the wrappers are removed.\n\nMost failed outer wrappers are discarded by truncating actions_len after\nchild resources have been released. CHECK_PKT_LEN also trims its parent\nafter branch resources are gone. SET/TUNNEL close failures unwind their\nknown tun_dst ownership directly, and SET_TO_MASKED has no external\nownership and truncates on close failure.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "057dbc5b72e9fcac439cd561c3a539b8a0edeb92",
              "status": "affected",
              "versionType": "git",
              "lessThan": "ab855641241387db062a5e41d9ad6b8561542572"
            },
            {
              "version": "2532adbfe917c0e71dba2650ffc6efe396314c87",
              "status": "affected",
              "versionType": "git",
              "lessThan": "c66bd2626c2764f23764ff0f8277f44a9cfe8349"
            },
            {
              "version": "4b1a0ee6164c7204c68ab5a9c48c07bfe8852485",
              "status": "affected",
              "versionType": "git",
              "lessThan": "d573250d228401f707f4dbc09d11227a6215ee5f"
            },
            {
              "version": "e6610f9c08b4c04cf7949c10fc246c071d00e935",
              "status": "affected",
              "versionType": "git",
              "lessThan": "f1efff8858403191361a01269c6fe8dd7f55a385"
            },
            {
              "version": "a1e64addf3ff9257b45b78bc7d743781c3f41340",
              "status": "affected",
              "versionType": "git",
              "lessThan": "dbd14f736be02cfe73049bd801af89becd1a0749"
            },
            {
              "version": "a1e64addf3ff9257b45b78bc7d743781c3f41340",
              "status": "affected",
              "versionType": "git",
              "lessThan": "1b41cbe05b184f8861712f0806cc0c4f5d8c6dfe"
            },
            {
              "version": "a1e64addf3ff9257b45b78bc7d743781c3f41340",
              "status": "affected",
              "versionType": "git",
              "lessThan": "3f1f755366687d051174739fb99f7d560202f60b"
            },
            {
              "version": "6b099d285d7ed324494b6d684f377aa103856118",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "5.15.180",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.15.212"
            },
            {
              "version": "6.1.132",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "6.1.178"
            },
            {
              "version": "6.6.84",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "6.6.145"
            },
            {
              "version": "6.12.20",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "6.12.97"
            },
            {
              "version": "6.13.8",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "6.14"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "6.14",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "6.14"
            },
            {
              "version": "5.15.212",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.178",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.145",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.97",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.40",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "7.1.5",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "version": "7.2",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}