CVE-2026-69490
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Out-of-bounds Read in Windows USB Mass Storage Class Driver

Vulnerability report for CVE-2026-69490, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.

Publication date: 2026-09-08

Last updated on: 2026-09-24

Assigner: Microsoft Corporation

Description

Out-of-bounds read in Windows USB Mass Storage Class Driver allows an unauthorized attacker to elevate privileges with a physical attack.

CVSS Scores

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Meta Information

Published
2026-09-08
Last Modified
2026-09-24
Generated
2026-09-29
AI Q&A
2026-09-09
EPSS Evaluated
2026-09-27
NVD

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
microsoft windows_usb_mass_storage_class_driver *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-125 The product reads data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

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Executive Summary

This is an out-of-bounds read vulnerability in the Windows USB Mass Storage Class Driver. It allows an unauthorized attacker to elevate their privileges by exploiting a physical attack vector. The vulnerability could enable reading memory outside intended boundaries, potentially leading to unauthorized access or control.

Impact Analysis

An attacker with physical access could exploit this to gain elevated privileges on your system. This might allow them to install malware, steal data, or take control of your device. The impact includes potential data breaches, system compromise, and unauthorized access to sensitive information.

Compliance Impact

This vulnerability could lead to unauthorized access to personal or sensitive data, violating GDPR and HIPAA requirements. Organizations may face legal penalties, fines, or reputational damage due to non-compliance with data protection regulations if this flaw is exploited.

Mitigation Strategies

Disable or restrict physical access to USB ports to prevent unauthorized physical attacks. Ensure Windows is updated with the latest security patches to address the out-of-bounds read vulnerability in the USB Mass Storage Class Driver.

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