EUVD-2026-43819
GHSA-g4jf-6563-q525
Severity by source
AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Physical USB connection required (AV:P); no authentication needed (PR:N); kernel heap overflow yields full SYSTEM-level CIA impact (C:H/I:H/A:H) within unchanged scope.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.org
Heap-based buffer overflow in Windows USB Video Driver allows an unauthorized attacker to elevate privileges with a physical attack.
AnalysisAI
Privilege escalation to SYSTEM level is achievable in the Windows USB Video Class (UVC) driver across a broad swath of Windows 10, 11, and Server editions via physical connection of a malicious USB device. The heap-based buffer overflow (CWE-122) is triggered when the driver processes attacker-controlled UVC descriptors from a crafted device, corrupting kernel heap memory. No active exploitation is confirmed (absent from CISA KEV, SSVC exploitation=none), and EPSS sits at 0.37% (29th percentile), consistent with the physical access barrier that makes mass exploitation impractical.
Technical ContextAI
The vulnerability resides in the Windows USB Video Class driver (usbvideo.sys), which implements the USB Device Class Definition for Video Devices (UVC) - a standardized protocol for webcams, capture cards, and video input peripherals. CWE-122 (Heap-based Buffer Overflow) indicates the driver writes beyond the bounds of a heap-allocated buffer when parsing attacker-supplied UVC descriptor or stream data from a connected USB device. This class of bug in a kernel-mode driver is directly exploitable for privilege escalation because heap memory corruption in kernel space can overwrite function pointers, security tokens, or other control structures. CPE strings confirm the affected component spans Microsoft Windows 10 (versions 1607 through 22H2), Windows 11 (24H2 and 25H2), and Windows Server 2012 through 2025 - essentially every supported and several extended-support Windows releases.
RemediationAI
Apply the Microsoft security update for the affected Windows version, available via Windows Update or directly through the MSRC advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-49804. Specific target build numbers per EUVD: Windows 11 24H2 → 10.0.26100.8875 or later; Windows Server 2025 → 10.0.26100.33158 or later; Windows 10 22H2/21H2 → 10.0.19045.7548/10.0.19044.7548 or later; Windows Server 2022 → 10.0.20348.5386 or later; Windows Server 2019/1809 → 10.0.17763.9020 or later; Windows Server 2016/1607 → 10.0.14393.9339 or later; Windows Server 2012 R2 → 6.3.9600.23291 or later; Windows Server 2012 → 6.2.9200.26226 or later. If immediate patching is not possible, the most effective compensating control is physically blocking or disabling USB ports on sensitive systems - this can be enforced via Group Policy (Device Installation Restrictions), endpoint DLP tools, or physical port locks. Alternatively, disable the USB Video Class driver via Device Manager or a GPO software restriction; note this will break all USB webcams and video capture devices on the affected host. For server environments with exposed USB ports, ensure physical security controls (locked server rooms, restricted datacenter access) are in place.
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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