CVE-2026-69584: Windows USB Video Driver Privilege Escalation

CVE-2026-69584 Overview

CVE-2026-69584 is an integer overflow vulnerability [CWE-190] in the Windows USB Video Class (UVC) driver. An authorized local attacker can trigger the overflow to elevate privileges on the affected system. The flaw resides in kernel-mode driver code that handles USB video device data, making successful exploitation a path to SYSTEM-level access.

Microsoft published the advisory on 2026-09-08. The vulnerability requires local access and low-level privileges, with no user interaction needed. Because the driver runs in kernel space, successful exploitation compromises the confidentiality, integrity, and availability of the entire host.

Critical Impact
Local privilege escalation to SYSTEM through a kernel-mode driver, enabling full compromise of the affected Windows host.

Affected Products

Windows USB Video Class (UVC) driver
Microsoft Windows (versions listed in the Microsoft Security Update Guide)
Systems with USB video devices enabled through the in-box driver

Discovery Timeline

2026-09-08 - CVE CVE-2026-69584 published to NVD
2026-09-10 - Last updated in NVD database

Technical Details for CVE-2026-69584

Vulnerability Analysis

The vulnerability is an integer overflow or wraparound [CWE-190] in the Windows USB Video Driver. The driver processes descriptors and control data supplied by USB video devices in kernel mode. An arithmetic operation on attacker-influenced values wraps past the maximum representable integer, producing a smaller-than-expected result. Subsequent memory allocations or bounds checks rely on this truncated value, leading to out-of-bounds memory access in kernel space.

Because the driver executes with kernel privileges, memory corruption within its context can be steered to overwrite kernel structures or dispatch pointers. An attacker who already holds a local low-privileged account can leverage this to run arbitrary code as SYSTEM. The attack does not require user interaction and completes within the local security scope.

Root Cause

The defect is a missing or insufficient check on the result of an arithmetic computation before it is used to size a buffer or index into memory. When the operation overflows, the driver operates on undersized buffers while treating attacker-supplied lengths as valid. This mismatch produces the kernel memory corruption primitive used for privilege escalation.

Attack Vector

Exploitation requires local access and an authenticated context on the target host. An attacker interacts with the USB Video driver through device I/O paths reachable from user mode, or by presenting a crafted USB video device to a system that automatically binds the in-box driver. The overflow trigger, buffer corruption, and control-flow hijack occur inside kernel context, yielding SYSTEM privileges without any user interaction.

No public proof-of-concept code is available. See the Microsoft Security Update Guide for vendor technical details.

Detection Methods for CVE-2026-69584

Indicators of Compromise

Unexpected kernel-mode crashes or bugchecks referencing usbvideo.sys or related USB stack components.
New SYSTEM-owned processes spawned from user-context parents shortly after USB device enumeration events.
Unusual USB device attach events on servers or workstations without a business need for video peripherals.

Detection Strategies

Monitor Windows kernel telemetry for anomalous privilege transitions originating from processes that interact with USB device I/O control codes.
Correlate PnP device installation events (Event ID 20001, 20003) with subsequent process integrity level changes to SYSTEM.
Alert on driver load or reload events for USB video components outside of scheduled maintenance windows.

Monitoring Recommendations

Enable kernel driver auditing and forward usbvideo.sys load, unload, and crash events to a centralized log platform.
Track USB device enumeration on high-value hosts and flag unknown vendor or product IDs.
Baseline expected USB peripheral inventory and alert on deviations, particularly on servers and administrative workstations.

How to Mitigate CVE-2026-69584

Immediate Actions Required

Apply the Microsoft security update referenced in the Microsoft Security Update Guide as soon as it is available for your Windows build.
Inventory hosts that expose USB ports and prioritize patching for multi-user systems, kiosks, and shared workstations.
Restrict local logon rights and remove standard users from systems that do not require interactive access.

Patch Information

Microsoft has issued a security update addressed via the Security Update Guide entry for CVE-2026-69584. Administrators should identify the applicable Knowledge Base article for each Windows version and deploy through Windows Update, WSUS, or an equivalent patch management workflow. Validate installation by confirming the updated usbvideo.sys file version on affected endpoints.

Workarounds

Use Group Policy or device installation restrictions to block installation of USB video class devices where they are not required.
Disable unused USB ports through firmware settings or endpoint device control policies.
Limit local account privileges so that untrusted users cannot invoke the vulnerable driver paths.

bash

# Configuration example: block USB video class device installation via Group Policy
# Computer Configuration > Administrative Templates > System > Device Installation >
#   Device Installation Restrictions > Prevent installation of devices that match any of these device IDs
# Add the USB Video Class compatible ID:
USB\Class_0E