EUVD-2026-73576
GHSA-xrff-5qhc-2wvh
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Local kernel driver exploitation by low-privilege account with no interaction; full C/I/A impact on vulnerable system after kernel code execution; scope unchanged.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
5DescriptionCVE.org
Integer underflow (wrap or wraparound) in Windows USB Audio Class driver (usbaudio.sys) allows an authorized attacker to elevate privileges locally.
AnalysisAI
Privilege escalation via integer underflow in Windows USB Audio Class driver (usbaudio.sys) allows a local low-privileged user to gain SYSTEM-level access across virtually the entire Windows ecosystem. The flaw spans Windows Server 2012 through Windows 11 26H1 and Server 2025, making it a broad-surface local elevation-of-privilege issue. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a local user account with at least standard (low) privileges - confirmed by PR:L in the CVSS vector. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.8 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) reflects a straightforward local privilege escalation: low-privilege account access is the only prerequisite, no interaction is required, and exploitation complexity is low. … 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 security update via Windows Update, WSUS, or Microsoft Update Catalog. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all affected systems running Windows Server 2012-2025 and Windows 11 versions 26H1 or earlier, and prioritize assets in sensitive network zones such as domain controllers, file servers, and security infrastructure. …
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Same weakness CWE-191 – Integer Underflow
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External POC / Exploit Code
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