CVE-2026-80967 (GCVE-0-2026-80967)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:42 – Updated: 2026-10-30 12:31
VLAI
Title
ALSA: pcxhr: initialize mutexes before requesting threaded IRQ
Summary
In the Linux kernel, the following vulnerability has been resolved: ALSA: pcxhr: initialize mutexes before requesting threaded IRQ pcxhr_probe() requests pcxhr_threaded_irq() before initializing mgr->lock, even though the threaded handler takes that mutex. Initialize the manager locks before request_threaded_irq() so an early interrupt cannot run against uninitialized mutex state during probe.
Severity
8.4 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 19:21 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 9bef72bdb26e291d6dffb04768741a0e49582666 , < 20a0f80f67a1495a57e5a3ba0fa172a0f919691d (git)
Affected: 9bef72bdb26e291d6dffb04768741a0e49582666 , < 039602d6ddb1febbb0561b30dab04461f78a1319 (git)
Affected: 9bef72bdb26e291d6dffb04768741a0e49582666 , < a5f405adb0229c9cf64eb3d695c333c92e3d3d4f (git)
Affected: 9bef72bdb26e291d6dffb04768741a0e49582666 , < ede25b7fea0d7487ee8528bf35dc7b9a1cbcd814 (git)
Affected: 9bef72bdb26e291d6dffb04768741a0e49582666 , < c069b3cfd753d6688ea0271c43553631ab38ce10 (git)
Affected: 9bef72bdb26e291d6dffb04768741a0e49582666 , < 7ef9ad82d95dd3c74570d80a689a0570fbc7539e (git)
Affected: 9bef72bdb26e291d6dffb04768741a0e49582666 , < 7cf280fbef5db6310e1b32074c8c34d1ba459796 (git)
Affected: 9bef72bdb26e291d6dffb04768741a0e49582666 , < 6c97817e20598e5473094e0e38d1f51f1cf4dfff (git)
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Linux Linux Affected: 3.18
Unaffected: 0 , < 3.18 (semver)
Unaffected: 5.10.273 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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              "value": "AV:L - The flaw is reached only from snd-pcxhr PCI probe (pcxhr_probe() -\u003e request_threaded_irq() -\u003e 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-\u003eprmh 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-\u003elock (and pcxhr_msg_thread() may take uninitialized mgr-\u003emsg_lock) with a zeroed wait_list, then reads through NULL mgr-\u003eprmh; 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-\u003elock 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-\u003eprmh in pcxhr_msg_thread() cause a kernel oops or panic during probe, fully denying availability."
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      "cve": "CVE-2026-80967",
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      "title": "ALSA: pcxhr: initialize mutexes before requesting threaded IRQ",
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            "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-\u003elock, 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."
          }
        ],
        "id": "CVE-2026-80967",
        "lastModified": "2026-10-30T13:20:14.423",
        "metrics": {
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                "baseScore": 8.4,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
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              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
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              "ssvcData": {
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                "options": [
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                    "exploitation": "none"
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                  },
                  {
                    "technicalImpact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-16T19:21:30.969232Z",
                "version": "2.0.3"
              }
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        "published": "2026-09-11T20:19:02.720",
        "references": [
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            "url": "https://git.kernel.org/stable/c/7ef9ad82d95dd3c74570d80a689a0570fbc7539e"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/a5f405adb0229c9cf64eb3d695c333c92e3d3d4f"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c069b3cfd753d6688ea0271c43553631ab38ce10"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/ede25b7fea0d7487ee8528bf35dc7b9a1cbcd814"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-11-07T04:53:39+00:00",
      "cve": "CVE-2026-80967",
      "id": "CVE-2026-80967",
      "initial_release_date": "2026-09-11T00:00:00+00:00",
      "product_status:known_affected": "203",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ALSA: pcxhr: initialize mutexes before requesting threaded IRQ",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80967.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-80967",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-10-16T19:21:30.969232Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-10-16T19:21:31.785Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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              "versions": [
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              "programFiles": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
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                  "status": "affected",
                  "version": "3.18"
                },
                {
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                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
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                  "status": "unaffected",
                  "version": "5.15.221",
                  "versionType": "semver"
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                  "lessThanOrEqual": "6.1.*",
                  "status": "unaffected",
                  "version": "6.1.188",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.157",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.12.*",
                  "status": "unaffected",
                  "version": "6.12.109",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.18.*",
                  "status": "unaffected",
                  "version": "6.18.50",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "7.2.*",
                  "status": "unaffected",
                  "version": "7.2.4",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "7.3",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
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                {
                  "cpeMatch": [
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                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.221",
                      "versionStartIncluding": "3.18",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1.188",
                      "versionStartIncluding": "3.18",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6.157",
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                    {
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                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "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-\u003elock, 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."
            }
          ],
          "metrics": [
            {
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                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:L - The flaw is reached only from snd-pcxhr PCI probe (pcxhr_probe() -\u003e request_threaded_irq() -\u003e 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-\u003eprmh 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-\u003elock (and pcxhr_msg_thread() may take uninitialized mgr-\u003emsg_lock) with a zeroed wait_list, then reads through NULL mgr-\u003eprmh; 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-\u003elock 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-\u003eprmh in pcxhr_msg_thread() cause a kernel oops or panic during probe, fully denying availability."
                }
              ]
            }
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            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
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          "references": [
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              "url": "https://git.kernel.org/stable/c/039602d6ddb1febbb0561b30dab04461f78a1319"
            },
            {
              "url": "https://git.kernel.org/stable/c/a5f405adb0229c9cf64eb3d695c333c92e3d3d4f"
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            },
            {
              "url": "https://git.kernel.org/stable/c/6c97817e20598e5473094e0e38d1f51f1cf4dfff"
            }
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          "title": "ALSA: pcxhr: initialize mutexes before requesting threaded IRQ",
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            "engine": "bippy-1.2.0"
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      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2026-80967",
        "datePublished": "2026-09-11T19:42:31.811Z",
        "dateReserved": "2026-08-26T14:34:25.810Z",
        "dateUpdated": "2026-10-19T08:45:52.076Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
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    }
  }
}



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