{"id":"CVE-2026-93808","summary":"ALSA: usb-audio: caiaq: validate EP1 reply lengths","details":"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-\u003eactual_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.","modified":"2026-10-22T10:36:06.919229680Z","published":"2026-09-24T16:02:43.621Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93808.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/319393151367e6626affedcdd4f7b7b0286f4246"},{"type":"WEB","url":"https://git.kernel.org/stable/c/74f3c639f64fa5da4e1613149798b5089bce2807"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7cc6b3745a0cea697c8d0684b3094f220281a08d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/91acd231f219452fa58285239f83945accad9513"},{"type":"WEB","url":"https://git.kernel.org/stable/c/aba30af07d4fe499b50209801eba9da8a815522f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/add9328c91c195c494cd68a21b19e5e47a20d784"},{"type":"WEB","url":"https://git.kernel.org/stable/c/af8a172c4f71ac30d625f2966d2389a7fa872819"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93808.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93808"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"523f1dce37434a9a6623bf46e7893e2b4b10ac3c"},{"fixed":"91acd231f219452fa58285239f83945accad9513"},{"fixed":"7cc6b3745a0cea697c8d0684b3094f220281a08d"},{"fixed":"add9328c91c195c494cd68a21b19e5e47a20d784"},{"fixed":"319393151367e6626affedcdd4f7b7b0286f4246"},{"fixed":"af8a172c4f71ac30d625f2966d2389a7fa872819"},{"fixed":"74f3c639f64fa5da4e1613149798b5089bce2807"},{"fixed":"aba30af07d4fe499b50209801eba9da8a815522f"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-93808.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.22"},{"fixed":"5.10.271"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.222"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.189"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.158"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.111"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.53"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-93808.json"}}],"schema_version":"1.9.2"}