{
  "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-2026-63889",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-63889",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-07-19T14:55:01.515Z",
    "updatedAt": "2026-10-19T20:17:54.988Z",
    "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": "scsi: scsi_transport_fc: Widen FPIN pname walker counter to u32",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: scsi_transport_fc: Widen FPIN pname walker counter to u32\n\nAn adjacent Fibre Channel fabric actor that can deliver an FPIN ELS\nframe to an lpfc or qla2xxx Linux initiator can trigger a non-return in\nthe generic FC transport. This is not a local userspace or IP network\npath; the attacker must be able to inject fabric traffic, for example as\na compromised switch or fabric controller, or as a same-zone N_Port on a\nfabric that permits source spoofing.\n\nThe Link-Integrity and Peer-Congestion FPIN walkers used a u8 loop\ncounter against the 32-bit on-wire pname_count field, and did not bound\npname_count by the descriptor body already validated by the TLV walker.\nA pname_count of 256 therefore wraps the counter and keeps the loop\ncondition true indefinitely.\n\nFactor the shared pname_list[] walk into one helper, widen the counter\nto u32, and clamp pname_count against the entries that fit in the\ndescriptor body before iterating.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "3dcfe0de5a9752e646a61f4ce513ac059960c7c3",
              "status": "affected",
              "versionType": "git",
              "lessThan": "07776b7779c9426982c1ad74aad91bd531593790"
            },
            {
              "version": "3dcfe0de5a9752e646a61f4ce513ac059960c7c3",
              "status": "affected",
              "versionType": "git",
              "lessThan": "29f126f09e34a425b376b3646c89aa7cc18b142c"
            },
            {
              "version": "3dcfe0de5a9752e646a61f4ce513ac059960c7c3",
              "status": "affected",
              "versionType": "git",
              "lessThan": "163bd704d7515c3df6c2e03bcba93d1db79edbff"
            },
            {
              "version": "3dcfe0de5a9752e646a61f4ce513ac059960c7c3",
              "status": "affected",
              "versionType": "git",
              "lessThan": "ee57b89e5da9fffbe0d26647e4ff0750dacb9943"
            },
            {
              "version": "3dcfe0de5a9752e646a61f4ce513ac059960c7c3",
              "status": "affected",
              "versionType": "git",
              "lessThan": "35461d23744175a78b6280293892cca357c22793"
            },
            {
              "version": "3dcfe0de5a9752e646a61f4ce513ac059960c7c3",
              "status": "affected",
              "versionType": "git",
              "lessThan": "bdff76dff6ec23d6fe35812fa33e5c4ce2cdb770"
            },
            {
              "version": "3dcfe0de5a9752e646a61f4ce513ac059960c7c3",
              "status": "affected",
              "versionType": "git",
              "lessThan": "a9a39233ec1fc9f97ea1340a4d09bb7ec2be5153"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "5.11",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "5.11"
            },
            {
              "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": "*"
            }
          ]
        }
      ]
    }
  }
}