{
  "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-2026-63891",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-63891",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-07-19T14:55:02.840Z",
    "updatedAt": "2026-07-19T14:55:02.840Z",
    "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": "thunderbolt: property: Cap recursion depth in __tb_property_parse_dir()",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nthunderbolt: property: Cap recursion depth in __tb_property_parse_dir()\n\nA DIRECTORY entry's value field is used as the dir_offset for a\nrecursive call into __tb_property_parse_dir() with no depth counter.\nA crafted peer that chains DIRECTORY entries into a back-reference\nloop drives the parser until the kernel stack is exhausted and the\nguard page fires.  Any untrusted XDomain peer (cable, dock, in-line\ninspector, adjacent host) that reaches the PROPERTIES_REQUEST\ncontrol-plane exchange can trigger this without authentication.\n\nThread a depth counter through tb_property_parse() and\n__tb_property_parse_dir(), and reject blocks that exceed\nTB_PROPERTY_MAX_DEPTH = 8.  That is comfortably larger than any\nobserved legitimate XDomain layout.\n\nOperators who do not need XDomain host-to-host discovery can disable\nthe path entirely with thunderbolt.xdomain=0 on the kernel command\nline.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179",
              "status": "affected",
              "versionType": "git",
              "lessThan": "2b5f47a710172c962ef42d1b732b04d2ad0dce21"
            },
            {
              "version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179",
              "status": "affected",
              "versionType": "git",
              "lessThan": "95839a67ea56ca35732aad7f711404a3127cfe2d"
            },
            {
              "version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179",
              "status": "affected",
              "versionType": "git",
              "lessThan": "0a84ab9271936c11e84e511bb52fc5682f8b6726"
            },
            {
              "version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179",
              "status": "affected",
              "versionType": "git",
              "lessThan": "b4621e5ef63405c317a84b711faf3bd75b3c6a94"
            },
            {
              "version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179",
              "status": "affected",
              "versionType": "git",
              "lessThan": "f31c6d220f455b5af63590302b30e1b932d14599"
            },
            {
              "version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179",
              "status": "affected",
              "versionType": "git",
              "lessThan": "830c8a9b467e7d3a158483d37fa7dc13892b293a"
            },
            {
              "version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179",
              "status": "affected",
              "versionType": "git",
              "lessThan": "ed9455ef4bd9babc90f92e526abe3fb68c1a8709"
            },
            {
              "version": "cdae7c07e3e3509eaabc18c1640a55dc5b99c179",
              "status": "affected",
              "versionType": "git",
              "lessThan": "928abe19fbf0127003abcb1ea69cabc1c897d0ab"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "4.15",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "4.15"
            },
            {
              "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": "*"
            }
          ]
        }
      ]
    }
  }
}