{"id":"CVE-2026-80816","summary":"ALSA: FCP: Use a private URB for the notification endpoint","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: FCP: Use a private URB for the notification endpoint\n\nfcp_init_notify() used mixer-\u003eurb, which snd_usb_mixer_status_create()\nallocates for the optional UAC2 status interrupt endpoint and mixer.c\nkills, resubmits and frees. On a device with that endpoint,\nfcp_init_notify()'s \"already set up\" early return fires on the status\nURB and returns success without doing anything. No FCP notification\nURB is submitted, and cmd_done is left zeroed because it is\ninitialised past that early return and nowhere else. fcp_init() then\nissues init1_opcode and wait_for_completion_timeout() would crash\nadding to the zeroed wait.head. fcp_cleanup_urb() would also kill and\nfree mixer.c's status URB.\n\nUse a separate URB in fcp_data, and initialise cmd_done in\nfcp_init_private() where fcp_data is allocated. fcp_init_notify() is\nreached again after suspend via fcp_reinit(), and the URB kill path in\nfcp_notify() completes cmd_done, leaving a stale count that would\nsatisfy the next command's wait before the device ACKs. Use\nreinit_completion() to clear it.","modified":"2026-09-06T03:46:51.267952313Z","published":"2026-09-04T15:13:37.310Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80816.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/5da21a434171e8ecf1d992c6f1d84c0c706fd395"},{"type":"WEB","url":"https://git.kernel.org/stable/c/65aceb45ca91ddb7f7ed178821f481b34da35543"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6db3c1d7e2872c9904e05ca8e0515920776a3c9c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/918b8d231c571c50a00efe92ffc8404a537a0490"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80816.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80816"},{"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":"46757a3e7d50dac923888e7fbe68377736f13c70"},{"fixed":"65aceb45ca91ddb7f7ed178821f481b34da35543"},{"fixed":"5da21a434171e8ecf1d992c6f1d84c0c706fd395"},{"fixed":"6db3c1d7e2872c9904e05ca8e0515920776a3c9c"},{"fixed":"918b8d231c571c50a00efe92ffc8404a537a0490"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80816.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.14.0"},{"fixed":"6.18.47"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.11"}]},{"type":"ECOSYSTEM","events":[{"introduced":"7.2.0"},{"fixed":"7.2.1"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80816.json"}}],"schema_version":"1.9.0"}