{
  "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-2026-53221",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-53221",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-06-25T08:39:23.177Z",
    "updatedAt": "2026-10-19T19:57:29.527Z",
    "importedAt": "2026-10-24T01:58:20.586Z",
    "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": "ip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()\n\nIn vti6_tnl_lookup(), when an exact match for a tunnel fails,\nthe code falls back to searching for wildcard tunnels:\n\n- Tunnels matching the packet's local address, with any remote address\n  wildcard remote).\n\n- Tunnels matching the packet's remote address, with any local address\n  (wildcard local).\n\nHowever, vti6 stores all these different types of tunnels in the same\nhash table (ip6n->tnls_r_l) prone to hash collisions.\n\nThe bug is that the fallback search loops in vti6_tnl_lookup() were\nmissing checks to ensure that the candidate tunnel actually has\na wildcard address.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "fbe68ee87522f6eaa10f9076c0a7117e1613f2f7",
              "status": "affected",
              "versionType": "git",
              "lessThan": "c327fa4fca31415431202e063767a7ae342e19c6"
            },
            {
              "version": "fbe68ee87522f6eaa10f9076c0a7117e1613f2f7",
              "status": "affected",
              "versionType": "git",
              "lessThan": "fc657ac0767c49839b3ef0b08dc0953ca30883f8"
            },
            {
              "version": "fbe68ee87522f6eaa10f9076c0a7117e1613f2f7",
              "status": "affected",
              "versionType": "git",
              "lessThan": "47fb3c2b4203556308e64354b3e78f2ce221d646"
            },
            {
              "version": "fbe68ee87522f6eaa10f9076c0a7117e1613f2f7",
              "status": "affected",
              "versionType": "git",
              "lessThan": "f513f308cc4bdb4530d033431592ffbc29b7fca1"
            },
            {
              "version": "fbe68ee87522f6eaa10f9076c0a7117e1613f2f7",
              "status": "affected",
              "versionType": "git",
              "lessThan": "90fd4513315ca07da99cfd8549d3e553a7160f0d"
            },
            {
              "version": "fbe68ee87522f6eaa10f9076c0a7117e1613f2f7",
              "status": "affected",
              "versionType": "git",
              "lessThan": "2abfb19bbb81958714ad1d43ebeb65b30394184b"
            },
            {
              "version": "fbe68ee87522f6eaa10f9076c0a7117e1613f2f7",
              "status": "affected",
              "versionType": "git",
              "lessThan": "2fc7bc087cc7085368263d9d37bfe9a0bddd6a2d"
            },
            {
              "version": "fbe68ee87522f6eaa10f9076c0a7117e1613f2f7",
              "status": "affected",
              "versionType": "git",
              "lessThan": "a5c0359f5cbc51a2e2b114d6041e0f3c73f903e9"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "3.19",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "3.19"
            },
            {
              "version": "5.10.259",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.210",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.176",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.143",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.94",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.36",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "7.0.13",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.0.*"
            },
            {
              "version": "7.1",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}