{
  "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-2026-80550",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-80550",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-08-26T14:37:19.956Z",
    "updatedAt": "2026-10-16T19:26:26.153Z",
    "importedAt": "2026-10-24T01:58:30.346Z",
    "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": "s390/vfio_ccw: Fix out of bounds check on CCW array",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/vfio_ccw: Fix out of bounds check on CCW array\n\nThe routine ccwchain_calc_length() counts the number of channel\ncommand words (CCWs) that are chained together in a single channel\nprogram, and rejects anything larger than CCWCHAIN_LEN_MAX (256) CCWs.\n\nThe loop itself is \"do..while (count < 257)\", and while the logic in\nis_cpa_within_range() correctly adjusts between the 0-index array of\nCCWs and the count of CCWs starting at 1, this means it would look\nat a possible 257th CCW before ending the loop and (correctly)\nreturning an error.\n\nFix this by restructuring the loop to break as soon as 256 CCWs\n(thus indexes 0-255) are examined, without looking at memory\noutside the range.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0a19e61e6d4c6192077ead760ba0a2d350987d4c",
              "status": "affected",
              "versionType": "git",
              "lessThan": "0282fb1c4b638eecfe2cc558092c460911d8f7e2"
            },
            {
              "version": "0a19e61e6d4c6192077ead760ba0a2d350987d4c",
              "status": "affected",
              "versionType": "git",
              "lessThan": "907adc667d902fafbdb2d740d57b55bd025dc4cd"
            },
            {
              "version": "0a19e61e6d4c6192077ead760ba0a2d350987d4c",
              "status": "affected",
              "versionType": "git",
              "lessThan": "f20be33d093ce7630c17ff7ed93caf7eaf8ac1a3"
            },
            {
              "version": "0a19e61e6d4c6192077ead760ba0a2d350987d4c",
              "status": "affected",
              "versionType": "git",
              "lessThan": "af3f80ca4c8b17f20f9e588def076288fdb49e65"
            },
            {
              "version": "0a19e61e6d4c6192077ead760ba0a2d350987d4c",
              "status": "affected",
              "versionType": "git",
              "lessThan": "499a8a66b1598bfab97182aed15e0f1646074a3d"
            },
            {
              "version": "0a19e61e6d4c6192077ead760ba0a2d350987d4c",
              "status": "affected",
              "versionType": "git",
              "lessThan": "4c2e1d359d7a2b82cdf3254e4e480af9417f99fb"
            },
            {
              "version": "0a19e61e6d4c6192077ead760ba0a2d350987d4c",
              "status": "affected",
              "versionType": "git",
              "lessThan": "d5d096cd9369e986d4e5153baa86b8b35c283e09"
            },
            {
              "version": "0a19e61e6d4c6192077ead760ba0a2d350987d4c",
              "status": "affected",
              "versionType": "git",
              "lessThan": "a005b7f1a491ffda61bff0fd0f6548f8986fb977"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "4.12",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "4.12"
            },
            {
              "version": "5.10.266",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.217",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.184",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.153",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.105",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.46",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "7.1.10",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "version": "7.2",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}