EUVD-2026-43809
GHSA-2hx5-jhg7-4j46
Severity by source
AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Physical device plug-in is the sole trigger (AV:P, PR:N, UI:N); kernel read overflow yields confidentiality impact only with no write or availability consequence.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.org
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) enables physical attackers to disclose kernel memory contents across a broad range of Windows 10, Windows 11, and Windows Server releases. Exploitation requires plugging a crafted USB audio device into the target machine, making remote attack impossible by design. No public exploit exists and SSVC exploitation status is confirmed as none, though the High confidentiality impact rating reflects that kernel memory disclosure can expose sensitive in-memory data if triggered.
Technical ContextAI
The vulnerability resides in usbaudio.sys, the Windows kernel-mode driver responsible for enumerating and communicating with USB Audio Class devices. CWE-125 (Out-of-bounds Read) identifies the root cause as the driver reading memory beyond the intended buffer boundary - most likely when parsing malformed USB device descriptors or control-transfer payloads supplied by a rogue USB device. Because device enumeration is handled automatically by the kernel at plug-in time, the flaw is reachable before any user interaction or authentication. Affected CPEs span Windows 10 versions 1607 through 22H2, Windows 11 versions 24H2 through 26H1, and Windows Server 2012 through 2025 (including Server Core installations), as confirmed by EUVD-2026-43809 and Microsoft MSRC.
RemediationAI
Apply the Microsoft security update available via Windows Update or WSUS, detailed at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-49794. Exact fix builds confirmed by EUVD: Windows Server 2025 ≥ 10.0.26100.33158, Windows Server 2022 ≥ 10.0.20348.5386, Windows Server 2019 ≥ 10.0.17763.9020, Windows Server 2016 ≥ 10.0.14393.9339, Windows Server 2012 R2 ≥ 6.3.9600.23291, Windows Server 2012 ≥ 6.2.9200.26226, Windows 11 24H2/25H2 ≥ 10.0.26100.8875, Windows 11 26H1 ≥ 10.0.28000.2269, Windows 10 21H2 ≥ 10.0.19044.7548, Windows 10 22H2 ≥ 10.0.19045.7548, Windows 10 1809 ≥ 10.0.17763.9020, Windows 10 1607 ≥ 10.0.14393.9339. Where patching is immediately infeasible on high-value physically exposed machines (kiosks, shared workstations, conference room PCs), a compensating control is to disable the USB Audio Class device class via Group Policy (Device Installation Restrictions by device setup class GUID {4d36e96c-e325-11ce-bfc1-08002be10318}) or through Device Manager. This prevents usbaudio.sys from loading for untrusted devices but will also block legitimate USB audio peripherals - trade that off against physical risk in the specific environment.
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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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