{"id":"CVE-2026-93808","state":"PUBLISHED","title":"ALSA: usb-audio: caiaq: validate EP1 reply lengths","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: caiaq: validate EP1 reply lengths\n\nusb_ep1_command_reply_dispatch() uses buf[0] as a command byte and then\nreads command-specific fixed items from the same URB buffer. Several\npaths use buf + 1, buf[1], buf[2], or buf + 3 without first proving that\nurb->actual_length contains those bytes.\n\nAdd per-command length checks, use a payload length derived from the\nbytes after the command byte for the control-state copy, and reject short\nanalog input payloads before the input helper reads fixed offsets from\nthe EP1 reply.","publishedAt":"2026-09-24T16:02:43.621Z","updatedAt":"2026-10-03T10:57:41.411Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"523f1dce37434a9a6623bf46e7893e2b4b10ac3c","status":"affected","lessThan":"91acd231f219452fa58285239f83945accad9513","versionType":"git"},{"version":"523f1dce37434a9a6623bf46e7893e2b4b10ac3c","status":"affected","lessThan":"7cc6b3745a0cea697c8d0684b3094f220281a08d","versionType":"git"},{"version":"523f1dce37434a9a6623bf46e7893e2b4b10ac3c","status":"affected","lessThan":"add9328c91c195c494cd68a21b19e5e47a20d784","versionType":"git"},{"version":"523f1dce37434a9a6623bf46e7893e2b4b10ac3c","status":"affected","lessThan":"319393151367e6626affedcdd4f7b7b0286f4246","versionType":"git"},{"version":"523f1dce37434a9a6623bf46e7893e2b4b10ac3c","status":"affected","lessThan":"af8a172c4f71ac30d625f2966d2389a7fa872819","versionType":"git"},{"version":"523f1dce37434a9a6623bf46e7893e2b4b10ac3c","status":"affected","lessThan":"74f3c639f64fa5da4e1613149798b5089bce2807","versionType":"git"},{"version":"523f1dce37434a9a6623bf46e7893e2b4b10ac3c","status":"affected","lessThan":"aba30af07d4fe499b50209801eba9da8a815522f","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/usb/caiaq/device.c","sound/usb/caiaq/input.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.22","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.22","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","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":["sound/usb/caiaq/device.c","sound/usb/caiaq/input.c"]}],"references":["https://git.kernel.org/stable/c/91acd231f219452fa58285239f83945accad9513","https://git.kernel.org/stable/c/7cc6b3745a0cea697c8d0684b3094f220281a08d","https://git.kernel.org/stable/c/add9328c91c195c494cd68a21b19e5e47a20d784","https://git.kernel.org/stable/c/319393151367e6626affedcdd4f7b7b0286f4246","https://git.kernel.org/stable/c/af8a172c4f71ac30d625f2966d2389a7fa872819","https://git.kernel.org/stable/c/74f3c639f64fa5da4e1613149798b5089bce2807","https://git.kernel.org/stable/c/aba30af07d4fe499b50209801eba9da8a815522f"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/93xxx/CVE-2026-93808.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-93808","state":"PUBLISHED","datePublished":"2026-09-24T16:02:43.621Z","dateUpdated":"2026-10-03T10:57:41.411Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-18T17:59:28.790Z"},"containers":{"cna":{"title":"ALSA: usb-audio: caiaq: validate EP1 reply lengths","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: caiaq: validate EP1 reply lengths\n\nusb_ep1_command_reply_dispatch() uses buf[0] as a command byte and then\nreads command-specific fixed items from the same URB buffer. Several\npaths use buf + 1, buf[1], buf[2], or buf + 3 without first proving that\nurb->actual_length contains those bytes.\n\nAdd per-command length checks, use a payload length derived from the\nbytes after the command byte for the control-state copy, and reject short\nanalog input payloads before the input helper reads fixed offsets from\nthe EP1 reply."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"523f1dce37434a9a6623bf46e7893e2b4b10ac3c","status":"affected","lessThan":"91acd231f219452fa58285239f83945accad9513","versionType":"git"},{"version":"523f1dce37434a9a6623bf46e7893e2b4b10ac3c","status":"affected","lessThan":"7cc6b3745a0cea697c8d0684b3094f220281a08d","versionType":"git"},{"version":"523f1dce37434a9a6623bf46e7893e2b4b10ac3c","status":"affected","lessThan":"add9328c91c195c494cd68a21b19e5e47a20d784","versionType":"git"},{"version":"523f1dce37434a9a6623bf46e7893e2b4b10ac3c","status":"affected","lessThan":"319393151367e6626affedcdd4f7b7b0286f4246","versionType":"git"},{"version":"523f1dce37434a9a6623bf46e7893e2b4b10ac3c","status":"affected","lessThan":"af8a172c4f71ac30d625f2966d2389a7fa872819","versionType":"git"},{"version":"523f1dce37434a9a6623bf46e7893e2b4b10ac3c","status":"affected","lessThan":"74f3c639f64fa5da4e1613149798b5089bce2807","versionType":"git"},{"version":"523f1dce37434a9a6623bf46e7893e2b4b10ac3c","status":"affected","lessThan":"aba30af07d4fe499b50209801eba9da8a815522f","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/usb/caiaq/device.c","sound/usb/caiaq/input.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.22","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.22","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","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":["sound/usb/caiaq/device.c","sound/usb/caiaq/input.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/91acd231f219452fa58285239f83945accad9513"},{"url":"https://git.kernel.org/stable/c/7cc6b3745a0cea697c8d0684b3094f220281a08d"},{"url":"https://git.kernel.org/stable/c/add9328c91c195c494cd68a21b19e5e47a20d784"},{"url":"https://git.kernel.org/stable/c/319393151367e6626affedcdd4f7b7b0286f4246"},{"url":"https://git.kernel.org/stable/c/af8a172c4f71ac30d625f2966d2389a7fa872819"},{"url":"https://git.kernel.org/stable/c/74f3c639f64fa5da4e1613149798b5089bce2807"},{"url":"https://git.kernel.org/stable/c/aba30af07d4fe499b50209801eba9da8a815522f"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-03T10:57:41.411Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.22","versionEndExcluding":"5.10.271"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.22","versionEndExcluding":"5.15.222"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.22","versionEndExcluding":"6.1.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.22","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.22","versionEndExcluding":"6.12.111"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.22","versionEndExcluding":"6.18.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.22","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}