{"id":"CVE-2026-98769","state":"PUBLISHED","title":"usb: gadget: f_uac1_legacy: validate bRequest index in generic_{set,get}_cmd","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_uac1_legacy: validate bRequest index in generic_{set,get}_cmd\n\ngeneric_set_cmd() and generic_get_cmd() use the low nibble of\nctrl->bRequest as an index into con->data[]:\n\n    u8 cmd = (ctrl->bRequest & 0x0F);  /* 0 .. 15 */\n    ...\n    con->data[cmd] = value;            /* OOB when cmd >= 5 */\n\nstruct usb_audio_control (include/linux/usb/audio.h) declares data as\na 5-element array, so indices 5 through 15 write (or read) up to 44\nbytes past the end of the array on the heap.\n\nA malicious USB host can craft a class-specific SET_CUR / GET_CUR\nrequest with an arbitrary bRequest value, triggering the out-of-bounds\naccess from an IRQ completion handler with no further preconditions.\n\nAdd an ARRAY_SIZE() guard to both functions.","publishedAt":"2026-10-18T15:48:04.800Z","updatedAt":"2026-10-30T12:39:38.690Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c47d7b09891abb4f8b222317c89c7469bed8db3a","status":"affected","lessThan":"3e655ebe0e45b7b026a4d3e6c10586b95164b3fd","versionType":"git"},{"version":"c47d7b09891abb4f8b222317c89c7469bed8db3a","status":"affected","lessThan":"f8a4ddc23056560dc3333839a4c6998f644db303","versionType":"git"},{"version":"c47d7b09891abb4f8b222317c89c7469bed8db3a","status":"affected","lessThan":"f0ff630d83c12c9a97637dded1dc27558bee3760","versionType":"git"},{"version":"c47d7b09891abb4f8b222317c89c7469bed8db3a","status":"affected","lessThan":"da841c1511a6160b8bc6bb7b7c6d4c9fb76fb51e","versionType":"git"},{"version":"c47d7b09891abb4f8b222317c89c7469bed8db3a","status":"affected","lessThan":"36f3f009049bc91e14dc856007932473318d12f8","versionType":"git"},{"version":"c47d7b09891abb4f8b222317c89c7469bed8db3a","status":"affected","lessThan":"8c611876c002d712ae5f246af5188432c708f79d","versionType":"git"},{"version":"c47d7b09891abb4f8b222317c89c7469bed8db3a","status":"affected","lessThan":"697cfe6e53b66cda196d6f8833b0ee97fefd0a8a","versionType":"git"},{"version":"c47d7b09891abb4f8b222317c89c7469bed8db3a","status":"affected","lessThan":"9062d50e75c24dc7911be05c9b1719b3b256af15","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/gadget/function/f_uac1_legacy.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.31","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.31","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.56","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.10","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","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_uac1_legacy.c"]}],"references":["https://git.kernel.org/stable/c/3e655ebe0e45b7b026a4d3e6c10586b95164b3fd","https://git.kernel.org/stable/c/f8a4ddc23056560dc3333839a4c6998f644db303","https://git.kernel.org/stable/c/f0ff630d83c12c9a97637dded1dc27558bee3760","https://git.kernel.org/stable/c/da841c1511a6160b8bc6bb7b7c6d4c9fb76fb51e","https://git.kernel.org/stable/c/36f3f009049bc91e14dc856007932473318d12f8","https://git.kernel.org/stable/c/8c611876c002d712ae5f246af5188432c708f79d","https://git.kernel.org/stable/c/697cfe6e53b66cda196d6f8833b0ee97fefd0a8a","https://git.kernel.org/stable/c/9062d50e75c24dc7911be05c9b1719b3b256af15"],"weaknesses":[],"ingestedAt":"2026-10-30T13:00:06.648Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/98xxx/CVE-2026-98769.json","commit":"cb14bf1b43b0c9f05f7f40eae2246263fd430780","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98769","state":"PUBLISHED","datePublished":"2026-10-18T15:48:04.800Z","dateUpdated":"2026-10-30T12:39:38.690Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.369Z"},"containers":{"cna":{"title":"usb: gadget: f_uac1_legacy: validate bRequest index in generic_{set,get}_cmd","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_uac1_legacy: validate bRequest index in generic_{set,get}_cmd\n\ngeneric_set_cmd() and generic_get_cmd() use the low nibble of\nctrl->bRequest as an index into con->data[]:\n\n    u8 cmd = (ctrl->bRequest & 0x0F);  /* 0 .. 15 */\n    ...\n    con->data[cmd] = value;            /* OOB when cmd >= 5 */\n\nstruct usb_audio_control (include/linux/usb/audio.h) declares data as\na 5-element array, so indices 5 through 15 write (or read) up to 44\nbytes past the end of the array on the heap.\n\nA malicious USB host can craft a class-specific SET_CUR / GET_CUR\nrequest with an arbitrary bRequest value, triggering the out-of-bounds\naccess from an IRQ completion handler with no further preconditions.\n\nAdd an ARRAY_SIZE() guard to both functions."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"c47d7b09891abb4f8b222317c89c7469bed8db3a","status":"affected","lessThan":"3e655ebe0e45b7b026a4d3e6c10586b95164b3fd","versionType":"git"},{"version":"c47d7b09891abb4f8b222317c89c7469bed8db3a","status":"affected","lessThan":"f8a4ddc23056560dc3333839a4c6998f644db303","versionType":"git"},{"version":"c47d7b09891abb4f8b222317c89c7469bed8db3a","status":"affected","lessThan":"f0ff630d83c12c9a97637dded1dc27558bee3760","versionType":"git"},{"version":"c47d7b09891abb4f8b222317c89c7469bed8db3a","status":"affected","lessThan":"da841c1511a6160b8bc6bb7b7c6d4c9fb76fb51e","versionType":"git"},{"version":"c47d7b09891abb4f8b222317c89c7469bed8db3a","status":"affected","lessThan":"36f3f009049bc91e14dc856007932473318d12f8","versionType":"git"},{"version":"c47d7b09891abb4f8b222317c89c7469bed8db3a","status":"affected","lessThan":"8c611876c002d712ae5f246af5188432c708f79d","versionType":"git"},{"version":"c47d7b09891abb4f8b222317c89c7469bed8db3a","status":"affected","lessThan":"697cfe6e53b66cda196d6f8833b0ee97fefd0a8a","versionType":"git"},{"version":"c47d7b09891abb4f8b222317c89c7469bed8db3a","status":"affected","lessThan":"9062d50e75c24dc7911be05c9b1719b3b256af15","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/gadget/function/f_uac1_legacy.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.31","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.31","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.56","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.10","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","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_uac1_legacy.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/3e655ebe0e45b7b026a4d3e6c10586b95164b3fd"},{"url":"https://git.kernel.org/stable/c/f8a4ddc23056560dc3333839a4c6998f644db303"},{"url":"https://git.kernel.org/stable/c/f0ff630d83c12c9a97637dded1dc27558bee3760"},{"url":"https://git.kernel.org/stable/c/da841c1511a6160b8bc6bb7b7c6d4c9fb76fb51e"},{"url":"https://git.kernel.org/stable/c/36f3f009049bc91e14dc856007932473318d12f8"},{"url":"https://git.kernel.org/stable/c/8c611876c002d712ae5f246af5188432c708f79d"},{"url":"https://git.kernel.org/stable/c/697cfe6e53b66cda196d6f8833b0ee97fefd0a8a"},{"url":"https://git.kernel.org/stable/c/9062d50e75c24dc7911be05c9b1719b3b256af15"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:39:38.690Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"5.10.273"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"5.15.224"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"6.12.113"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"6.18.56"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"7.2.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.31","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}