EUVD-2026-76290
GHSA-gf23-mfwg-9j7j
Severity by source
AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Race condition during kernel probe requires precise interrupt timing (AC:H) and hardware installation or module-reload privileges (PR:H); kernel memory corruption preserves C:H/I:H/A:H.
Primary rating from Vendor (Linux).
CVSS VectorVendor: Linux
Lifecycle Timeline
6DescriptionCVE.org
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.
AnalysisAI
Uninitialized mutex use-before-initialization in the Linux kernel's ALSA pcxhr driver exposes systems with Digigram PCXHR audio hardware to a race condition during driver probe. The pcxhr_probe() function calls request_threaded_irq() before mgr->lock is initialized; if an interrupt fires during the probe window, the threaded IRQ handler attempts to acquire an uninitialized mutex, resulting in undefined kernel behavior ranging from panic to memory corruption. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires: (1) physical presence of a Digigram PCXHR professional audio card (PCI) in the target system - this eliminates the overwhelming majority of Linux deployments; (2) a vulnerable kernel version (before the fixes in 7.2.4, 6.18.50, 6.12.109, or 7.3-rc1); (3) a race window during driver probe, which is timing-dependent and may vary across hardware/SMP configurations. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Real-world risk is significantly lower than the input CVSS 8.4 (AV:L/AC:L/PR:N/UI:N/C:H/I:H/A:H) suggests. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Update to a patched kernel version: Linux 7.2.4, 6.18.50, or 6.12.109 as appropriate for the deployed stable branch; upstream fix is also present in 7.3-rc1. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit inventory systems to identify any deployed Digigram PCXHR audio hardware-the most effective control is excluding this legacy hardware from production environments. …
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External POC / Exploit Code
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