EUVD-2026-44284
GHSA-m76h-mm96-3jh3
Severity by source
AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Physical USB connection required to trigger driver enumeration (AV:P); no OS-level authentication needed before driver loads (PR:N); impact limited to kernel memory read with no write or denial-of-service capability (C:H/I:N/A:N).
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 the Windows USB Audio Class driver (usbaudio.sys) exposes kernel memory contents to an attacker who physically connects a crafted USB audio device to an unpatched system. Affected systems span Windows 10 (1809 through 22H2), Windows 11 (24H2 through 26H1), and Windows Server 2019/2022/2025, as confirmed by EUVD-2026-44284 and the MSRC advisory. No public exploit code has been identified at time of analysis, and EPSS at 0.42% (34th percentile) reflects low automated exploitation probability consistent with the mandatory physical access requirement.
Technical ContextAI
The vulnerability resides in usbaudio.sys, the Windows kernel-mode USB Audio Class driver responsible for enumerating and communicating with USB audio peripherals such as headsets, microphones, and DACs. CWE-125 (Out-of-Bounds Read) indicates the driver fails to validate buffer boundaries when processing device descriptors or audio class-specific control responses from a connected USB device. A malicious USB device can supply crafted descriptor or control data that causes the driver to read beyond a valid buffer during enumeration, leaking kernel memory to the device or a co-located attacker. The physical attack vector (AV:P in the CVSS vector) reflects the hardware-layer trigger - the flaw activates before any OS authentication context is established. Affected CPE strings span cpe:2.3:a:microsoft:windows_10_version_1809 through cpe:2.3:a:microsoft:windows_server_2025 across both standard and Server Core installation variants.
RemediationAI
Apply the Microsoft security update for CVE-2026-58528 via Windows Update, WSUS, or the Microsoft Update Catalog. Target build thresholds are: Windows 10 1809 and Server 2019 to 10.0.17763.9020; Windows 10 21H2 to 10.0.19044.7548; Windows 10 22H2 to 10.0.19045.7548; Windows 11 24H2 and 25H2 to 10.0.26100.8875; Windows 11 26H1 to 10.0.28000.2525; Windows Server 2022 to 10.0.20348.5386; Windows Server 2025 to 10.0.26100.33158. Full advisory details are at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58528. Where immediate patching is not feasible, enforce USB device class restrictions via Group Policy (Device Installation Restrictions) or endpoint security tools to block unauthorized USB Audio Class devices - this prevents the driver from loading for untrusted hardware and eliminates the attack surface. Be aware that this compensating control will also block legitimate USB headsets and speakerphones, so assess business impact before deployment. Physical port lockdown (port blockers, chassis locks) is an additional physical-layer control for high-sensitivity systems.
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Same weakness CWE-125 – Out-of-bounds Read
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External POC / Exploit Code
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