EUVD-2026-44065
GHSA-64gj-f6wv-47qm
Severity by source
AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Physical device connection required (AV:P); no OS credentials needed to trigger driver load (PR:N); impact is read-only kernel memory disclosure with no integrity or availability consequence.
Primary rating from Vendor (microsoft).
CVSS VectorNVD
Lifecycle Timeline
4DescriptionNVD
Out-of-bounds read in Windows USB Audio Class driver (usbaudio.sys) allows an unauthorized attacker to disclose information with a physical attack.
AnalysisAI
Out-of-bounds read in usbaudio.sys (Windows USB Audio Class driver) exposes kernel memory contents to attackers with physical device access across Windows 10, Windows 11, and Windows Server 2012 through 2025. An attacker who can physically connect a crafted USB audio device causes the driver to read beyond an allocated buffer, potentially leaking sensitive kernel memory to the attacker. No public exploit exists and no active exploitation has been identified; SSVC rates this as non-automatable with partial technical impact, placing it firmly in the lower-urgency tier despite its wide platform coverage.
Technical ContextAI
The vulnerability resides in usbaudio.sys, the Windows USB Audio Class driver responsible for handling USB audio devices conforming to the USB Audio Class 1.0 and 2.0 specifications. CWE-125 (Out-of-Bounds Read) indicates the driver reads memory beyond the boundary of an allocated buffer when processing data from a connected USB audio device - most likely when parsing USB device descriptors, audio format blocks, or stream control data supplied by the device itself, without adequate bounds validation. This class of flaw typically arises when a kernel driver trusts device-supplied length or offset fields without clamping them against the allocated buffer size. CPE data from NVD confirms the vulnerable component spans Windows 10 versions 1607 through 22H2, Windows 11 versions 24H2, 25H2, and 26H1, and Windows Server editions from 2012 through 2025, indicating the flaw is present across a long-standing, broadly distributed driver codebase.
RemediationAI
The primary fix is applying the Microsoft security update for CVE-2026-50453 via Windows Update or WSUS, with the full update guide at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50453. Target build versions confirmed by EUVD include: Windows 10 22H2 to 10.0.19045.7548, Windows 10 21H2 to 10.0.19044.7548, Windows 10 1809 or Server 2019 to 10.0.17763.9020, Windows 10 1607 or Server 2016 to 10.0.14393.9339, Windows 11 24H2 or Server 2025 to 10.0.26100.8875 or 10.0.26100.33158 respectively, Windows 11 25H2 to 10.0.26200.8875, Windows 11 26H1 to 10.0.28000.2269, Server 2022 to 10.0.20348.5386, Server 2012 to 6.2.9200.26226, and Server 2012 R2 to 6.3.9600.23291. For systems that cannot be immediately patched, enforce USB device installation restrictions via Windows Group Policy under Computer Configuration > Administrative Templates > System > Device Installation > Device Installation Restrictions, setting 'Prevent installation of devices using drivers that match these device setup classes' to block USB audio class devices (setup class GUID {4d36e96c-e325-11ce-bfc1-08002be10318}); this eliminates the attack surface at the cost of blocking legitimate USB audio hardware on those endpoints.
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Same weakness CWE-125 – Out-of-bounds Read
View allSame technique Buffer Overflow
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External POC / Exploit Code
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