{
  "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-2026-63992",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-63992",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-07-19T14:56:12.528Z",
    "updatedAt": "2026-10-19T20:18:01.188Z",
    "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": "tunnels: do not assume transport header in iptunnel_pmtud_check_icmp()",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\ntunnels: do not assume transport header in iptunnel_pmtud_check_icmp()\n\nIn some cases, iptunnel_pmtud_check_icmp() can be called while\nskb transport header is not set.\n\nThis triggers an out-of-bound access, because\n(typeof(skb->transport_header))~0U is 65535.\n\nAccess the icmp header based on IPv4 network header,\nafter making sure icmp->type is present in skb linear part.\n\nNote that iptunnel_pmtud_check_icmpv6()) is fine.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "4cb47a8644cc9eb8ec81190a50e79e6530d0297f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "5a92cb45e34749865d03daf8d3500f77b5f6644c"
            },
            {
              "version": "4cb47a8644cc9eb8ec81190a50e79e6530d0297f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "c7b7ec3e69e673c0d6b57f74d21da50c485c598e"
            },
            {
              "version": "4cb47a8644cc9eb8ec81190a50e79e6530d0297f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "7f4f7efe7f30edd29c4988de01728bf2398217e4"
            },
            {
              "version": "4cb47a8644cc9eb8ec81190a50e79e6530d0297f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "e917d0c69f01af2bb4fbea2b66d560a53b3ac7ec"
            },
            {
              "version": "4cb47a8644cc9eb8ec81190a50e79e6530d0297f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "a096b6e34f602950af9a2b0856cd93a5f4c276d7"
            },
            {
              "version": "4cb47a8644cc9eb8ec81190a50e79e6530d0297f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "43368636c663cff6e59dde93cf4b8e43ac28eb93"
            },
            {
              "version": "4cb47a8644cc9eb8ec81190a50e79e6530d0297f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "cb549df9ce4ee15c9d5b19ddab12cf2128e4313c"
            },
            {
              "version": "4cb47a8644cc9eb8ec81190a50e79e6530d0297f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "509323077ef79a26ba0c60bb556e45c12c398b2d"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "5.9",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "5.9"
            },
            {
              "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": "6.12.93",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.35",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "7.0.12",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.0.*"
            },
            {
              "version": "7.1",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}