{"id":"CVE-2026-74679","state":"PUBLISHED","title":"usb: gadget: f_ncm: Use unsigned int for ndp_index","description":"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.","publishedAt":"2026-08-22T15:32:47.499Z","updatedAt":"2026-08-22T15:32:47.499Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"370af734dfaf8336b496b386e194648e097e248a","status":"affected","lessThan":"9c8c6825a750fcd3efbe922847ca70ccd5a66857","versionType":"git"},{"version":"370af734dfaf8336b496b386e194648e097e248a","status":"affected","lessThan":"a1c0deeba4a46481543d6b09c665f758c54c3a1a","versionType":"git"},{"version":"370af734dfaf8336b496b386e194648e097e248a","status":"affected","lessThan":"d13f650a3485b58c124b3cda45597e8002c9c833","versionType":"git"},{"version":"370af734dfaf8336b496b386e194648e097e248a","status":"affected","lessThan":"11413d7ed42174b8f5d8d0b6a25d10dc88239b21","versionType":"git"},{"version":"370af734dfaf8336b496b386e194648e097e248a","status":"affected","lessThan":"5b2b3a3229a3f4c493ffdee53aee2f173b6f13b3","versionType":"git"},{"version":"370af734dfaf8336b496b386e194648e097e248a","status":"affected","lessThan":"d328fdc607fa1bb668ad512e1c918a120f78f337","versionType":"git"},{"version":"370af734dfaf8336b496b386e194648e097e248a","status":"affected","lessThan":"fc9e54e22845c4da29588ca0986cb7c795b5a262","versionType":"git"},{"version":"370af734dfaf8336b496b386e194648e097e248a","status":"affected","lessThan":"6b1c8a9403a26cb0fed7a648916c74dc236da591","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/gadget/function/f_ncm.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.17","versionType":"semver"},{"version":"5.10.265","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.216","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.152","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.104","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.45","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.9","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/gadget/function/f_ncm.c"]}],"references":["https://git.kernel.org/stable/c/9c8c6825a750fcd3efbe922847ca70ccd5a66857","https://git.kernel.org/stable/c/a1c0deeba4a46481543d6b09c665f758c54c3a1a","https://git.kernel.org/stable/c/d13f650a3485b58c124b3cda45597e8002c9c833","https://git.kernel.org/stable/c/11413d7ed42174b8f5d8d0b6a25d10dc88239b21","https://git.kernel.org/stable/c/5b2b3a3229a3f4c493ffdee53aee2f173b6f13b3","https://git.kernel.org/stable/c/d328fdc607fa1bb668ad512e1c918a120f78f337","https://git.kernel.org/stable/c/fc9e54e22845c4da29588ca0986cb7c795b5a262","https://git.kernel.org/stable/c/6b1c8a9403a26cb0fed7a648916c74dc236da591"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/74xxx/CVE-2026-74679.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74679","state":"PUBLISHED","datePublished":"2026-08-22T15:32:47.499Z","dateUpdated":"2026-08-22T15:32:47.499Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-15T05:44:03.925Z"},"containers":{"cna":{"title":"usb: gadget: f_ncm: Use unsigned int for ndp_index","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"370af734dfaf8336b496b386e194648e097e248a","status":"affected","lessThan":"9c8c6825a750fcd3efbe922847ca70ccd5a66857","versionType":"git"},{"version":"370af734dfaf8336b496b386e194648e097e248a","status":"affected","lessThan":"a1c0deeba4a46481543d6b09c665f758c54c3a1a","versionType":"git"},{"version":"370af734dfaf8336b496b386e194648e097e248a","status":"affected","lessThan":"d13f650a3485b58c124b3cda45597e8002c9c833","versionType":"git"},{"version":"370af734dfaf8336b496b386e194648e097e248a","status":"affected","lessThan":"11413d7ed42174b8f5d8d0b6a25d10dc88239b21","versionType":"git"},{"version":"370af734dfaf8336b496b386e194648e097e248a","status":"affected","lessThan":"5b2b3a3229a3f4c493ffdee53aee2f173b6f13b3","versionType":"git"},{"version":"370af734dfaf8336b496b386e194648e097e248a","status":"affected","lessThan":"d328fdc607fa1bb668ad512e1c918a120f78f337","versionType":"git"},{"version":"370af734dfaf8336b496b386e194648e097e248a","status":"affected","lessThan":"fc9e54e22845c4da29588ca0986cb7c795b5a262","versionType":"git"},{"version":"370af734dfaf8336b496b386e194648e097e248a","status":"affected","lessThan":"6b1c8a9403a26cb0fed7a648916c74dc236da591","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/gadget/function/f_ncm.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.17","versionType":"semver"},{"version":"5.10.265","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.216","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.152","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.104","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.45","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.9","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/gadget/function/f_ncm.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/9c8c6825a750fcd3efbe922847ca70ccd5a66857"},{"url":"https://git.kernel.org/stable/c/a1c0deeba4a46481543d6b09c665f758c54c3a1a"},{"url":"https://git.kernel.org/stable/c/d13f650a3485b58c124b3cda45597e8002c9c833"},{"url":"https://git.kernel.org/stable/c/11413d7ed42174b8f5d8d0b6a25d10dc88239b21"},{"url":"https://git.kernel.org/stable/c/5b2b3a3229a3f4c493ffdee53aee2f173b6f13b3"},{"url":"https://git.kernel.org/stable/c/d328fdc607fa1bb668ad512e1c918a120f78f337"},{"url":"https://git.kernel.org/stable/c/fc9e54e22845c4da29588ca0986cb7c795b5a262"},{"url":"https://git.kernel.org/stable/c/6b1c8a9403a26cb0fed7a648916c74dc236da591"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-22T15:32:47.499Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"5.10.265"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"5.15.216"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"6.1.183"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"6.6.152"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"6.12.104"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"6.18.45"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"7.1.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.17","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}