{
  "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-2026-31617",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-31617",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-04-24T14:42:36.191Z",
    "updatedAt": "2026-10-15T01:17:13.982Z",
    "importedAt": "2026-10-24T01:58:02.025Z",
    "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": "usb: gadget: f_ncm: validate minimum block_len in ncm_unwrap_ntb()",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_ncm: validate minimum block_len in ncm_unwrap_ntb()\n\nThe block_len read from the host-supplied NTB header is checked against\nntb_max but has no lower bound. When block_len is smaller than\nopts->ndp_size, the bounds check of:\n\tndp_index > (block_len - opts->ndp_size)\nwill underflow producing a huge unsigned value that ndp_index can never\nexceed, defeating the check entirely.\n\nThe same underflow occurs in the datagram index checks against block_len\n- opts->dpe_size.  With those checks neutered, a malicious USB host can\nchoose ndp_index and datagram offsets that point past the actual\ntransfer, and the skb_put_data() copies adjacent kernel memory into the\nnetwork skb.\n\nFix this by rejecting block lengths that cannot hold at least the NTB\nheader plus one NDP.  This will make block_len - opts->ndp_size and\nblock_len - opts->dpe_size both well-defined.\n\nCommit 8d2b1a1ec9f5 (\"CDC-NCM: avoid overflow in sanity checking\") fixed\na related class of issues on the host side of NCM.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "2b74b0a04d3e9f9f08ff026e5663dce88ff94e52",
              "status": "affected",
              "versionType": "git",
              "lessThan": "068a7f2749fff6462a0a908ec415b885fe430f50"
            },
            {
              "version": "2b74b0a04d3e9f9f08ff026e5663dce88ff94e52",
              "status": "affected",
              "versionType": "git",
              "lessThan": "1425655c2870054c3ab4712e2b6dbdd331597ada"
            },
            {
              "version": "2b74b0a04d3e9f9f08ff026e5663dce88ff94e52",
              "status": "affected",
              "versionType": "git",
              "lessThan": "8b3b7bd3c02f98634baaf36c7fc7ac915f6517ca"
            },
            {
              "version": "2b74b0a04d3e9f9f08ff026e5663dce88ff94e52",
              "status": "affected",
              "versionType": "git",
              "lessThan": "0f156bb5334e588034ca68ac2ee92b23f66e56e7"
            },
            {
              "version": "2b74b0a04d3e9f9f08ff026e5663dce88ff94e52",
              "status": "affected",
              "versionType": "git",
              "lessThan": "8757a2593631443648218244b9788e193ae0fdc1"
            },
            {
              "version": "2b74b0a04d3e9f9f08ff026e5663dce88ff94e52",
              "status": "affected",
              "versionType": "git",
              "lessThan": "6762f8a95772265dd0c2ffe7f400493f3115b135"
            },
            {
              "version": "2b74b0a04d3e9f9f08ff026e5663dce88ff94e52",
              "status": "affected",
              "versionType": "git",
              "lessThan": "d58ba8f6546232f8414f396c189297dbee03f1a7"
            },
            {
              "version": "2b74b0a04d3e9f9f08ff026e5663dce88ff94e52",
              "status": "affected",
              "versionType": "git",
              "lessThan": "74908b0318d1df1188457040b8714ff4d4b68126"
            },
            {
              "version": "2b74b0a04d3e9f9f08ff026e5663dce88ff94e52",
              "status": "affected",
              "versionType": "git",
              "lessThan": "8f993d30b95dc9557a8a96ceca11abed674c8acb"
            },
            {
              "version": "f7e0611e207d8908c4f2858e244370529a76dbf7",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "b88ad6e714284b33a47834f5f2a294c2b37c66aa",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "471b23586387a32857778c511be60ab31c98dcfd",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "4f529c4d1e436230d3af7c09a3239677a14d2b46",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "ae6a5394d9fbe118bc95cfe376d6a9d91d7547e8",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "4.9.235",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "4.10"
            },
            {
              "version": "4.14.196",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "4.15"
            },
            {
              "version": "4.19.143",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "4.20"
            },
            {
              "version": "5.4.62",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.5"
            },
            {
              "version": "5.8.6",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.9"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "5.9",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "5.9"
            },
            {
              "version": "5.10.258",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.209",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.175",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.136",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.83",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.24",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "6.19.14",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.19.*"
            },
            {
              "version": "7.0.1",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.0.*"
            },
            {
              "version": "7.1",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}