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
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)
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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)
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{
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              "status": "unaffected",
              "version": "5.15.216",
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              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
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        }
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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"
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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",
  "vulnerability-lookup:meta": {
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      "cve": "CVE-2026-74679",
      "date": "2026-08-29",
      "epss": "0.00185",
      "percentile": "0.08172"
    },
    "microsoft_vex": {
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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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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/usb/gadget/function/f_ncm.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"370af734dfaf8336b496b386e194648e097e248a\",\"lessThan\":\"9c8c6825a750fcd3efbe922847ca70ccd5a66857\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"370af734dfaf8336b496b386e194648e097e248a\",\"lessThan\":\"a1c0deeba4a46481543d6b09c665f758c54c3a1a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"370af734dfaf8336b496b386e194648e097e248a\",\"lessThan\":\"d13f650a3485b58c124b3cda45597e8002c9c833\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"370af734dfaf8336b496b386e194648e097e248a\",\"lessThan\":\"11413d7ed42174b8f5d8d0b6a25d10dc88239b21\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"370af734dfaf8336b496b386e194648e097e248a\",\"lessThan\":\"5b2b3a3229a3f4c493ffdee53aee2f173b6f13b3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"370af734dfaf8336b496b386e194648e097e248a\",\"lessThan\":\"d328fdc607fa1bb668ad512e1c918a120f78f337\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"370af734dfaf8336b496b386e194648e097e248a\",\"lessThan\":\"fc9e54e22845c4da29588ca0986cb7c795b5a262\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"370af734dfaf8336b496b386e194648e097e248a\",\"lessThan\":\"6b1c8a9403a26cb0fed7a648916c74dc236da591\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/usb/gadget/function/f_ncm.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.17\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.17\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.152\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.104\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.45\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.9\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "current_release_date": "2026-08-24T11:23:27+00:00",
      "cve": "CVE-2026-74679",
      "id": "CVE-2026-74679",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "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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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.