{"id":"CVE-2026-80967","state":"PUBLISHED","title":"ALSA: pcxhr: initialize mutexes before requesting threaded IRQ","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: pcxhr: initialize mutexes before requesting threaded IRQ\n\npcxhr_probe() requests pcxhr_threaded_irq() before initializing\nmgr->lock, even though the threaded handler takes that mutex.\n\nInitialize the manager locks before request_threaded_irq() so an\nearly interrupt cannot run against uninitialized mutex state during\nprobe.","publishedAt":"2026-09-11T19:42:31.811Z","updatedAt":"2026-10-30T12:31:30.940Z","severity":{"score":8.4,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"9bef72bdb26e291d6dffb04768741a0e49582666","status":"affected","lessThan":"20a0f80f67a1495a57e5a3ba0fa172a0f919691d","versionType":"git"},{"version":"9bef72bdb26e291d6dffb04768741a0e49582666","status":"affected","lessThan":"039602d6ddb1febbb0561b30dab04461f78a1319","versionType":"git"},{"version":"9bef72bdb26e291d6dffb04768741a0e49582666","status":"affected","lessThan":"a5f405adb0229c9cf64eb3d695c333c92e3d3d4f","versionType":"git"},{"version":"9bef72bdb26e291d6dffb04768741a0e49582666","status":"affected","lessThan":"ede25b7fea0d7487ee8528bf35dc7b9a1cbcd814","versionType":"git"},{"version":"9bef72bdb26e291d6dffb04768741a0e49582666","status":"affected","lessThan":"c069b3cfd753d6688ea0271c43553631ab38ce10","versionType":"git"},{"version":"9bef72bdb26e291d6dffb04768741a0e49582666","status":"affected","lessThan":"7ef9ad82d95dd3c74570d80a689a0570fbc7539e","versionType":"git"},{"version":"9bef72bdb26e291d6dffb04768741a0e49582666","status":"affected","lessThan":"7cf280fbef5db6310e1b32074c8c34d1ba459796","versionType":"git"},{"version":"9bef72bdb26e291d6dffb04768741a0e49582666","status":"affected","lessThan":"6c97817e20598e5473094e0e38d1f51f1cf4dfff","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/pci/pcxhr/pcxhr.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.18","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.109","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/pci/pcxhr/pcxhr.c"]}],"references":["https://git.kernel.org/stable/c/20a0f80f67a1495a57e5a3ba0fa172a0f919691d","https://git.kernel.org/stable/c/039602d6ddb1febbb0561b30dab04461f78a1319","https://git.kernel.org/stable/c/a5f405adb0229c9cf64eb3d695c333c92e3d3d4f","https://git.kernel.org/stable/c/ede25b7fea0d7487ee8528bf35dc7b9a1cbcd814","https://git.kernel.org/stable/c/c069b3cfd753d6688ea0271c43553631ab38ce10","https://git.kernel.org/stable/c/7ef9ad82d95dd3c74570d80a689a0570fbc7539e","https://git.kernel.org/stable/c/7cf280fbef5db6310e1b32074c8c34d1ba459796","https://git.kernel.org/stable/c/6c97817e20598e5473094e0e38d1f51f1cf4dfff"],"weaknesses":[],"ingestedAt":"2026-10-30T12:50:04.827Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/80xxx/CVE-2026-80967.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-80967","state":"PUBLISHED","datePublished":"2026-09-11T19:42:31.811Z","dateUpdated":"2026-10-30T12:31:30.940Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-26T14:34:25.810Z"},"containers":{"cna":{"title":"ALSA: pcxhr: initialize mutexes before requesting threaded IRQ","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: pcxhr: initialize mutexes before requesting threaded IRQ\n\npcxhr_probe() requests pcxhr_threaded_irq() before initializing\nmgr->lock, even though the threaded handler takes that mutex.\n\nInitialize the manager locks before request_threaded_irq() so an\nearly interrupt cannot run against uninitialized mutex state during\nprobe."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"9bef72bdb26e291d6dffb04768741a0e49582666","status":"affected","lessThan":"20a0f80f67a1495a57e5a3ba0fa172a0f919691d","versionType":"git"},{"version":"9bef72bdb26e291d6dffb04768741a0e49582666","status":"affected","lessThan":"039602d6ddb1febbb0561b30dab04461f78a1319","versionType":"git"},{"version":"9bef72bdb26e291d6dffb04768741a0e49582666","status":"affected","lessThan":"a5f405adb0229c9cf64eb3d695c333c92e3d3d4f","versionType":"git"},{"version":"9bef72bdb26e291d6dffb04768741a0e49582666","status":"affected","lessThan":"ede25b7fea0d7487ee8528bf35dc7b9a1cbcd814","versionType":"git"},{"version":"9bef72bdb26e291d6dffb04768741a0e49582666","status":"affected","lessThan":"c069b3cfd753d6688ea0271c43553631ab38ce10","versionType":"git"},{"version":"9bef72bdb26e291d6dffb04768741a0e49582666","status":"affected","lessThan":"7ef9ad82d95dd3c74570d80a689a0570fbc7539e","versionType":"git"},{"version":"9bef72bdb26e291d6dffb04768741a0e49582666","status":"affected","lessThan":"7cf280fbef5db6310e1b32074c8c34d1ba459796","versionType":"git"},{"version":"9bef72bdb26e291d6dffb04768741a0e49582666","status":"affected","lessThan":"6c97817e20598e5473094e0e38d1f51f1cf4dfff","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/pci/pcxhr/pcxhr.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.18","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.109","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/pci/pcxhr/pcxhr.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/20a0f80f67a1495a57e5a3ba0fa172a0f919691d"},{"url":"https://git.kernel.org/stable/c/039602d6ddb1febbb0561b30dab04461f78a1319"},{"url":"https://git.kernel.org/stable/c/a5f405adb0229c9cf64eb3d695c333c92e3d3d4f"},{"url":"https://git.kernel.org/stable/c/ede25b7fea0d7487ee8528bf35dc7b9a1cbcd814"},{"url":"https://git.kernel.org/stable/c/c069b3cfd753d6688ea0271c43553631ab38ce10"},{"url":"https://git.kernel.org/stable/c/7ef9ad82d95dd3c74570d80a689a0570fbc7539e"},{"url":"https://git.kernel.org/stable/c/7cf280fbef5db6310e1b32074c8c34d1ba459796"},{"url":"https://git.kernel.org/stable/c/6c97817e20598e5473094e0e38d1f51f1cf4dfff"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.4,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The flaw is reached only from snd-pcxhr PCI probe (pcxhr_probe() -> request_threaded_irq() -> pcxhr_threaded_irq()) on a locally attached Digigram PCXHR board; studio, broadcast, and embedded audio systems enumerate that card at boot or udev bind, which is a local PCI probe path, not a network or USB protocol path.\nAC:L - pcxhr_probe() never masks PLX doorbell IRQs before request_threaded_irq(), so leftover or device-asserted PCXHR_IRQCS_ACTIVE_PCIDB plus TIMER/MASK bits wake pcxhr_threaded_irq() immediately; on preemptible kernels that handler preempts probe before mutex_init(), so the attacker does not depend on an uncontrollable race.\nPR:N - pcxhr_probe() performs no capability or authentication checks; when matching PCI hardware is present, kernel enumeration/udev runs the vulnerable request_threaded_irq() sequence automatically without an OS account or user-namespace privilege.\nUI:N - The uninitialized mutex is taken in the threaded IRQ during automatic PCI probe; no victim must open ALSA device nodes, load firmware, or otherwise interact.\nS:U - Uninitialized-mutex use and the follow-on NULL mgr->prmh dereference occur inside the host kernel pcxhr driver and do not cross a VM, container, or IOMMU security boundary.\nC:H - pcxhr_threaded_irq() takes uninitialized mgr->lock (and pcxhr_msg_thread() may take uninitialized mgr->msg_lock) with a zeroed wait_list, then reads through NULL mgr->prmh; that uninitialized-lock/IRQ-thread memory-safety failure can disclose kernel memory rather than a small bounded leak.\nI:H - Probe can mutex_init() mgr->lock while the IRQ thread still holds the zeroed mutex, and pcxhr_init_rmh() writes through NULL prmh; that lock-state corruption and invalid kernel write are exploitable memory-corruption/control-flow primitives, not a pure crash.\nA:H - Locking an uninitialized mutex, DEBUG_MUTEXES checks, and NULL dereference of mgr->prmh in pcxhr_msg_thread() cause a kernel oops or panic during probe, fully denying availability."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:31:30.940Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.18","versionEndExcluding":"5.10.273"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.18","versionEndExcluding":"5.15.221"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.18","versionEndExcluding":"6.1.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.18","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.18","versionEndExcluding":"6.12.109"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.18","versionEndExcluding":"6.18.50"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.18","versionEndExcluding":"7.2.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.18","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-80967","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T19:21:30.969232Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-16T19:26:36.758Z"}}]}}}