CVE-2026-85935

Analyzed Analyzed - Analysis Complete

Buffer Over-Read in Windows USB Driver

Publication date: 2026-10-13

Last updated on: 2026-10-28

Assigner: Microsoft Corporation

Description

Buffer over-read in Windows USB Driver allows an authorized attacker to disclose information locally.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-10-13

Last Modified

2026-10-28

Generated

2026-11-08

AI Q&A

2026-10-14

EPSS Evaluated

2026-11-07

NVD

CVE-2026-85935

EUVD

EUVD-2026-99632

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_server_2012	r2
microsoft	windows_server_2012	*
microsoft	windows_10_1607	to 10.0.14393.9612 (exc)
microsoft	windows_10_1607	to 10.0.14393.9612 (exc)
microsoft	windows_10_1809	to 10.0.17763.9376 (exc)
microsoft	windows_10_1809	to 10.0.17763.9376 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7807 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7807 (exc)
microsoft	windows_10_21h2	to 10.0.19044.7807 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7652 (exc)
microsoft	windows_11_23h2	to 10.0.22631.7652 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9711 (exc)
microsoft	windows_11_24h2	to 10.0.26100.9711 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9711 (exc)
microsoft	windows_11_25h2	to 10.0.26200.9711 (exc)
microsoft	windows_11_26h1	to 10.0.28000.3231 (exc)
microsoft	windows_11_26h1	to 10.0.28000.3231 (exc)
microsoft	windows_11_26h2	to 10.0.26300.9711 (exc)
microsoft	windows_11_26h2	to 10.0.26300.9711 (exc)
microsoft	windows_server_2025	to 10.0.26100.33650 (exc)
microsoft	windows_server_2022	to 10.0.20348.5761 (exc)
microsoft	windows_server_2016	to 10.0.14393.9612 (exc)
microsoft	windows_server_2019	to 10.0.17763.9376 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7807 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7807 (exc)
microsoft	windows_10_22h2	to 10.0.19045.7807 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-126	The product reads from a buffer using buffer access mechanisms such as indexes or pointers that reference memory locations after the targeted buffer.

Attack-Flow Graph

Executive Summary

This is a buffer over-read vulnerability in the Windows USB Driver. It allows an authorized attacker with local access to read beyond the intended memory buffer, potentially exposing sensitive information.

Detection Guidance

Detection typically involves monitoring for unusual USB driver behavior or memory access patterns. Use Windows Event Viewer to check for driver-related errors or warnings. Microsoft Defender for Endpoint can also detect anomalous activity. No specific commands are provided in the given context.

Impact Analysis

An attacker could exploit this to access confidential data stored in memory, such as passwords or encryption keys, if they have local system access. This could lead to further compromise of the system or data breaches.

Compliance Impact

This vulnerability allows unauthorized local information disclosure due to a buffer over-read in the Windows USB Driver. Such information exposure could potentially violate data protection requirements under GDPR (e.g., unauthorized access to personal data) and HIPAA (e.g., exposure of protected health information). Organizations must assess whether affected systems process regulated data and apply mitigations to maintain compliance.

Mitigation Strategies

Apply the latest Windows security updates from Microsoft Update. Disable unnecessary USB drivers if not required. Restrict local user permissions to reduce attack surface. Monitor for unusual activity via security tools.

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EPSS Chart

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