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

Vulnerability from cvelistv5 – Published: 2026-09-11 19:42 – Updated: 2026-09-14 11:59
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
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux 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: 5.15.221 , ≤ 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-rc1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
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          "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."
        }
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            "baseSeverity": "HIGH",
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            "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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-14T11:59:13.926Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "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"
        },
        {
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80967",
    "datePublished": "2026-09-11T19:42:31.811Z",
    "dateReserved": "2026-08-26T14:34:25.810Z",
    "dateUpdated": "2026-09-14T11:59:13.926Z",
    "state": "PUBLISHED"
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      "percentile": "0.08084"
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      "cve": "CVE-2026-80967",
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      "product_status:known_not_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "ALSA: pcxhr: initialize mutexes before requesting threaded IRQ",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-80967.json",
      "version": "3"
    },
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                "versions": [
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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": "2026-09-14T13:18:51.370",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "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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              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-09-11T20:19:02.720",
        "references": [
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            "url": "https://git.kernel.org/stable/c/039602d6ddb1febbb0561b30dab04461f78a1319"
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          }
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-09-14T18:27:18+00:00",
      "cve": "CVE-2026-80967",
      "id": "CVE-2026-80967",
      "initial_release_date": "2026-09-11T00:00:00+00:00",
      "product_status:known_affected": "276",
      "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"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:05:10Z",
      "cve": "CVE-2026-80967",
      "id": "CVE-2026-80967",
      "initial_release_date": "2026-09-12T16:36:44Z",
      "product_status:known_affected": "265",
      "product_status:known_not_affected": "88",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80967",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80967.json",
      "version": "4"
    }
  }
}



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