FKIE_CVE-2026-74679

Vulnerability from fkie_nvd - Published: 2026-08-22 16:16 - Updated: 2026-10-14 13:10
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_ncm: Use unsigned int for ndp_index The variable ndp_index is declared as a signed integer, but it stores the return value of get_ncm(), which is unsigned. A malicious host can supply a large offset that overflows the signed ndp_index, making it negative. Because ndp_index is compared against unsigned bounds, this negative value bypasses sanity checks and leads to an out-of-bounds read when calculating the address of the NDP block (ntb_ptr + ndp_index). Fix this by changing ndp_index to unsigned int to ensure consistent unsigned comparisons throughout the function.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/11413d7ed42174b8f5d8d0b6a25d10dc88239b21
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5b2b3a3229a3f4c493ffdee53aee2f173b6f13b3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6b1c8a9403a26cb0fed7a648916c74dc236da591
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9c8c6825a750fcd3efbe922847ca70ccd5a66857
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a1c0deeba4a46481543d6b09c665f758c54c3a1a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d13f650a3485b58c124b3cda45597e8002c9c833
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d328fdc607fa1bb668ad512e1c918a120f78f337
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fc9e54e22845c4da29588ca0986cb7c795b5a262
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/gadget/function/f_ncm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "9c8c6825a750fcd3efbe922847ca70ccd5a66857",
              "status": "affected",
              "version": "370af734dfaf8336b496b386e194648e097e248a",
              "versionType": "git"
            },
            {
              "lessThan": "a1c0deeba4a46481543d6b09c665f758c54c3a1a",
              "status": "affected",
              "version": "370af734dfaf8336b496b386e194648e097e248a",
              "versionType": "git"
            },
            {
              "lessThan": "d13f650a3485b58c124b3cda45597e8002c9c833",
              "status": "affected",
              "version": "370af734dfaf8336b496b386e194648e097e248a",
              "versionType": "git"
            },
            {
              "lessThan": "11413d7ed42174b8f5d8d0b6a25d10dc88239b21",
              "status": "affected",
              "version": "370af734dfaf8336b496b386e194648e097e248a",
              "versionType": "git"
            },
            {
              "lessThan": "5b2b3a3229a3f4c493ffdee53aee2f173b6f13b3",
              "status": "affected",
              "version": "370af734dfaf8336b496b386e194648e097e248a",
              "versionType": "git"
            },
            {
              "lessThan": "d328fdc607fa1bb668ad512e1c918a120f78f337",
              "status": "affected",
              "version": "370af734dfaf8336b496b386e194648e097e248a",
              "versionType": "git"
            },
            {
              "lessThan": "fc9e54e22845c4da29588ca0986cb7c795b5a262",
              "status": "affected",
              "version": "370af734dfaf8336b496b386e194648e097e248a",
              "versionType": "git"
            },
            {
              "lessThan": "6b1c8a9403a26cb0fed7a648916c74dc236da591",
              "status": "affected",
              "version": "370af734dfaf8336b496b386e194648e097e248a",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/gadget/function/f_ncm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.17"
            },
            {
              "lessThan": "3.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.152",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_ncm: Use unsigned int for ndp_index\n\nThe variable ndp_index is declared as a signed integer, but it stores\nthe return value of get_ncm(), which is unsigned.\n\nA malicious host can supply a large offset that overflows the signed\nndp_index, making it negative. Because ndp_index is compared against\nunsigned bounds, this negative value bypasses sanity checks and leads\nto an out-of-bounds read when calculating the address of the NDP\nblock (ntb_ptr + ndp_index).\n\nFix this by changing ndp_index to unsigned int to ensure consistent\nunsigned comparisons throughout the function."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nusb: gadget: f_ncm: Usar unsigned int para ndp_index\n\nLa variable ndp_index est\u00e1 declarada como un entero con signo, pero almacena el valor de retorno de get_ncm(), que es sin signo.\n\nUn host malicioso puede proporcionar un gran desplazamiento que desborda el ndp_index con signo, haci\u00e9ndolo negativo. Debido a que ndp_index se compara con l\u00edmites sin signo, este valor negativo elude las comprobaciones de cordura y conduce a una lectura fuera de l\u00edmites al calcular la direcci\u00f3n del bloque NDP (ntb_ptr + ndp_index).\n\nSolucione esto cambiando ndp_index a unsigned int para asegurar comparaciones sin signo consistentes a lo largo de la funci\u00f3n."
    }
  ],
  "id": "CVE-2026-74679",
  "lastModified": "2026-10-14T13:10:00.187",
  "metrics": {},
  "published": "2026-08-22T16:16:42.090",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/11413d7ed42174b8f5d8d0b6a25d10dc88239b21"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5b2b3a3229a3f4c493ffdee53aee2f173b6f13b3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6b1c8a9403a26cb0fed7a648916c74dc236da591"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9c8c6825a750fcd3efbe922847ca70ccd5a66857"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a1c0deeba4a46481543d6b09c665f758c54c3a1a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d13f650a3485b58c124b3cda45597e8002c9c833"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d328fdc607fa1bb668ad512e1c918a120f78f337"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fc9e54e22845c4da29588ca0986cb7c795b5a262"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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