{"id":"CVE-2026-80971","revision":"fc582fbc42c44f718e1dedd18baa5580","records":[{"revision":"fc582fbc42c44f718e1dedd18baa5580","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-80971","aliases":[],"title":"ALSA: bcd2000: clear the URB pointers on disconnect","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: bcd2000: clear the URB pointers on disconnect\n\nbcd2000_free_usb_related_resources() frees both URBs and leaves the\npointers behind:\n\n\tusb_kill_urb(bcd2k->midi_out_urb);\n\tusb_kill_urb(bcd2k->midi_in_urb);\n\n\tusb_free_urb(bcd2k->midi_out_urb);\n\tusb_free_urb(bcd2k->midi_in_urb);\n\nThe rawmidi device outlives that call. A substream that is still open\nwhen the device is unplugged reaches bcd2000_midi_send() from the\ntrigger path on close. That function writes to the freed URB and then\nhands it to the USB core:\n\n\tbcd2k->midi_out_urb->transfer_buffer_length = BUFSIZE;\n\t...\n\tret = usb_submit_urb(bcd2k->midi_out_urb, GFP_ATOMIC);\n\nusb_kill_urb() does not stop a later submission either, so a submit that\nraces the disconnect can requeue the URB after it has been reaped.\nmidi_in_urb is exposed the same way: bcd2000_input_complete() resubmits\nit from the completion handler.\n\nKASAN on 7.2.0-rc5 (arm64):\n\n BUG: KASAN: slab-use-after-free in bcd2000_midi_send [snd_bcd2000]\n Write of size 4 at addr ffff00001827d388 by task bpoc/168\n __asan_store4\n bcd2000_midi_send [snd_bcd2000]\n bcd2000_midi_output_trigger [snd_bcd2000]\n snd_rawmidi_kernel_write1\n close_substream.part.0\n Freed by task 168:\n usb_free_urb\n bcd2000_disconnect [snd_bcd2000]\n\n BUG: KASAN: slab-use-after-free in usb_submit_urb\n Read of size 8 at addr ffff00001827d3b8 by task bpoc/168\n\nClear both pointers after freeing and test them on the paths that can\nstill run. Poison the URBs before freeing them: usb_poison_urb() waits\nfor a running completion handler and rejects any later submission, so\nafter it returns the input path is quiesced and only the rawmidi trigger\npath can still reach bcd2000_midi_send(). No unpoison is needed; the\nURBs are freed on the next line.\n\nDiscovered by XBOW, triaged by Baul Lee ","state":0,"publishedAt":"2026-09-11T19:42:34.441+00:00","modifiedAt":"2026-10-19T08:45:55.974+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"sound/usb/bcd2000/bcd2000.c\"\n ],\n \"versions\": [\n {\n \"version\": \"b47a22290d581277be70e8a597824a4985d39e83\",\n \"lessThan\": \"9af08677aa57debaca5b57c8045c52a83d3dd376\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b47a22290d581277be70e8a597824a4985d39e83\",\n \"lessThan\": \"5a77febac6faf6da40fbb4555f703eeb91b58130\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b47a22290d581277be70e8a597824a4985d39e83\",\n \"lessThan\": \"3c00004f134fc819f9d9e202c6a64acde0a1f8d0\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b47a22290d581277be70e8a597824a4985d39e83\",\n \"lessThan\": \"6c07aad8a7c9ef8ebc4d03a964b882123a349a2e\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b47a22290d581277be70e8a597824a4985d39e83\",\n \"lessThan\": \"eb482a06791d6168beb8c78cc904ac5a5ed96a55\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b47a22290d581277be70e8a597824a4985d39e83\",\n \"lessThan\": \"7df3194bdb7479cad9199889655a566a2c0c1d1b\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b47a22290d581277be70e8a597824a4985d39e83\",\n \"lessThan\": \"b06ebc7fe25a6af4a9f6e4a3d4236a4178ad4b01\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"b47a22290d581277be70e8a597824a4985d39e83\",\n \"lessThan\": \"459d3a64766f5ca2f1886daeaf24582831a5f5ab\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"sound/usb/bcd2000/bcd2000.c\"\n ],\n \"versions\": [\n {\n \"version\": \"3.16\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"3.16\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.270\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.221\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.188\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.157\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.109\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.50\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2.4\",\n \"lessThanOrEqual\": \"7.2.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.3\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/9af08677aa57debaca5b57c8045c52a83d3dd376","https://git.kernel.org/stable/c/5a77febac6faf6da40fbb4555f703eeb91b58130","https://git.kernel.org/stable/c/3c00004f134fc819f9d9e202c6a64acde0a1f8d0","https://git.kernel.org/stable/c/6c07aad8a7c9ef8ebc4d03a964b882123a349a2e","https://git.kernel.org/stable/c/eb482a06791d6168beb8c78cc904ac5a5ed96a55","https://git.kernel.org/stable/c/7df3194bdb7479cad9199889655a566a2c0c1d1b","https://git.kernel.org/stable/c/b06ebc7fe25a6af4a9f6e4a3d4236a4178ad4b01","https://git.kernel.org/stable/c/459d3a64766f5ca2f1886daeaf24582831a5f5ab"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80971","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-80971","identifiers":["CVE-2026-80971"]},"retained":false,"historicalAffected":[]}],"coverage":[]}