EUVD-2026-73134
GHSA-9864-wj6c-pqw7
Severity by source
AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Physical USB device access required (AV:P); no prior auth needed (PR:N); UI:R for device enumeration; full kernel compromise on success (C:H/I:H/A:H).
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Integer overflow or wraparound in Windows USB Audio Class driver (usbaudio.sys) allows an unauthorized attacker to elevate privileges with a physical attack.
AnalysisAI
Privilege escalation to SYSTEM in the Windows USB Audio Class driver (usbaudio.sys) is achievable by an attacker with physical device access who connects a specially crafted USB audio device. The integer overflow in the driver's input-handling logic produces an undersized heap allocation, enabling a subsequent heap-based buffer overflow (CWE-122) that corrupts kernel memory and permits arbitrary code execution at elevated privilege. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Physical access to the target machine is mandatory (CVSS AV:P); this cannot be exploited remotely under any configuration. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H yields a score of 6.6, which accurately reflects the mandatory physical access constraint - the most significant limiting factor. … 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 | Apply the Microsoft Patch Tuesday security update that fixes usbaudio.sys across all affected Windows versions: the patched build targets are 10.0.17763.9245 (Win10 1809/Server 2019), 10.0.19044.7725 and 10.0.19045.7725 (Win10 21H2/22H2), 10.0.20348.5622 (Server 2022), 10.0.22631.7582 (Win11 23H2), 10.0.26100.9445 or 10.0.26100.33438 (Win11 24H2/Server 2025), 10.0.26200.9445 (Win11 25H2), and 10.0.28000.2954 (Win11 26H1). … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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