{
  "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-2026-63994",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-63994",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-07-19T14:56:13.896Z",
    "updatedAt": "2026-10-19T20:18:01.494Z",
    "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: load network headers after skb_cow() in iptunnel_pmtud_build_icmp[v6]()",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\ntunnels: load network headers after skb_cow() in iptunnel_pmtud_build_icmp[v6]()\n\nSashiko found that iptunnel_pmtud_build_icmp() and\niptunnel_pmtud_build_icmpv6() were caching ip_hdr() and ipv6_hdr()\nbefore an skb_cow() call which can reallocate skb->head.\n\nFix this possible UAF by initializing the local variables\nafter the skb_cow() call.\n\nRemove skb_reset_network_header() calls which were not needed.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "4cb47a8644cc9eb8ec81190a50e79e6530d0297f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "95b6d772bfe788331d9742d73eaa12e113b2adc4"
            },
            {
              "version": "4cb47a8644cc9eb8ec81190a50e79e6530d0297f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "7254aef4d1a7e18e887af9010e2f2dc34806789b"
            },
            {
              "version": "4cb47a8644cc9eb8ec81190a50e79e6530d0297f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "bf8b3f34c37c162357138e7c0942723b8b94fed1"
            },
            {
              "version": "4cb47a8644cc9eb8ec81190a50e79e6530d0297f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "76cd9398a0470257ab765bdf5f358a2af2e17934"
            },
            {
              "version": "4cb47a8644cc9eb8ec81190a50e79e6530d0297f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "50750d86a2e5266aba0c295483b3397843198b11"
            },
            {
              "version": "4cb47a8644cc9eb8ec81190a50e79e6530d0297f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "6dff77899b9e9fe5d854abda3a98ad04e7229ef7"
            },
            {
              "version": "4cb47a8644cc9eb8ec81190a50e79e6530d0297f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "f3f204541f280a6ecb04503a0d6794d93990ca43"
            },
            {
              "version": "4cb47a8644cc9eb8ec81190a50e79e6530d0297f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "b4bc94353050b1fa7b702bd4c6600710dd926cff"
            }
          ]
        },
        {
          "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": "*"
            }
          ]
        }
      ]
    }
  }
}