{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-80971", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-80971", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-09-11T19:42:34.441Z", "updatedAt": "2026-10-19T08:45:55.974Z", "importedAt": "2026-10-24T01:58:30.346Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "ALSA: bcd2000: clear the URB pointers on disconnect", "summary": "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 ", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "b47a22290d581277be70e8a597824a4985d39e83", "status": "affected", "versionType": "git", "lessThan": "9af08677aa57debaca5b57c8045c52a83d3dd376" }, { "version": "b47a22290d581277be70e8a597824a4985d39e83", "status": "affected", "versionType": "git", "lessThan": "5a77febac6faf6da40fbb4555f703eeb91b58130" }, { "version": "b47a22290d581277be70e8a597824a4985d39e83", "status": "affected", "versionType": "git", "lessThan": "3c00004f134fc819f9d9e202c6a64acde0a1f8d0" }, { "version": "b47a22290d581277be70e8a597824a4985d39e83", "status": "affected", "versionType": "git", "lessThan": "6c07aad8a7c9ef8ebc4d03a964b882123a349a2e" }, { "version": "b47a22290d581277be70e8a597824a4985d39e83", "status": "affected", "versionType": "git", "lessThan": "eb482a06791d6168beb8c78cc904ac5a5ed96a55" }, { "version": "b47a22290d581277be70e8a597824a4985d39e83", "status": "affected", "versionType": "git", "lessThan": "7df3194bdb7479cad9199889655a566a2c0c1d1b" }, { "version": "b47a22290d581277be70e8a597824a4985d39e83", "status": "affected", "versionType": "git", "lessThan": "b06ebc7fe25a6af4a9f6e4a3d4236a4178ad4b01" }, { "version": "b47a22290d581277be70e8a597824a4985d39e83", "status": "affected", "versionType": "git", "lessThan": "459d3a64766f5ca2f1886daeaf24582831a5f5ab" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "3.16", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "3.16" }, { "version": "5.10.270", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.221", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.188", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.157", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.109", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.50", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "7.2.4", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.2.*" }, { "version": "7.3", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }