CVE-2026-74679 (GCVE-0-2026-74679)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:32 – Updated: 2026-08-22 15:32
VLAI
Title
usb: gadget: f_ncm: Use unsigned int for ndp_index
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6667 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 370af734dfaf8336b496b386e194648e097e248a , < 9c8c6825a750fcd3efbe922847ca70ccd5a66857 (git)
Affected: 370af734dfaf8336b496b386e194648e097e248a , < a1c0deeba4a46481543d6b09c665f758c54c3a1a (git)
Affected: 370af734dfaf8336b496b386e194648e097e248a , < d13f650a3485b58c124b3cda45597e8002c9c833 (git)
Affected: 370af734dfaf8336b496b386e194648e097e248a , < 11413d7ed42174b8f5d8d0b6a25d10dc88239b21 (git)
Affected: 370af734dfaf8336b496b386e194648e097e248a , < 5b2b3a3229a3f4c493ffdee53aee2f173b6f13b3 (git)
Affected: 370af734dfaf8336b496b386e194648e097e248a , < d328fdc607fa1bb668ad512e1c918a120f78f337 (git)
Affected: 370af734dfaf8336b496b386e194648e097e248a , < fc9e54e22845c4da29588ca0986cb7c795b5a262 (git)
Affected: 370af734dfaf8336b496b386e194648e097e248a , < 6b1c8a9403a26cb0fed7a648916c74dc236da591 (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.17
Unaffected: 0 , < 3.17 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.152 , ≤ 6.6.* (semver)
Unaffected: 6.12.104 , ≤ 6.12.* (semver)
Unaffected: 6.18.45 , ≤ 6.18.* (semver)
Unaffected: 7.1.9 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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              "operator": "OR"
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      ],
      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-22T15:32:47.499Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/9c8c6825a750fcd3efbe922847ca70ccd5a66857"
        },
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          "url": "https://git.kernel.org/stable/c/a1c0deeba4a46481543d6b09c665f758c54c3a1a"
        },
        {
          "url": "https://git.kernel.org/stable/c/d13f650a3485b58c124b3cda45597e8002c9c833"
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        {
          "url": "https://git.kernel.org/stable/c/11413d7ed42174b8f5d8d0b6a25d10dc88239b21"
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        {
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      "title": "usb: gadget: f_ncm: Use unsigned int for ndp_index",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74679",
    "datePublished": "2026-08-22T15:32:47.499Z",
    "dateReserved": "2026-08-15T05:44:03.925Z",
    "dateUpdated": "2026-08-22T15:32:47.499Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
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      "date": "2026-10-15",
      "epss": "0.00185",
      "percentile": "0.07598"
    },
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      "cve": "CVE-2026-74679",
      "id": "msrc_CVE-2026-74679",
      "initial_release_date": "2026-08-24T01:06:42.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "usb: gadget: f_ncm: Use unsigned int for ndp_index",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74679.json",
      "version": "2"
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        "descriptions": [
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            "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": [
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          },
          {
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            "url": "https://git.kernel.org/stable/c/fc9e54e22845c4da29588ca0986cb7c795b5a262"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-01T10:37:46+00:00",
      "cve": "CVE-2026-74679",
      "id": "CVE-2026-74679",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: usb: gadget: f_ncm: Use unsigned int for ndp_index",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74679.json",
      "version": "3"
    }
  }
}



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