CVE-2026-68839

Analyzed Analyzed - Analysis Complete

Heap-based Buffer Overflow in Windows USB Mass Storage Class Driver

Publication date: 2026-09-08

Last updated on: 2026-09-24

Assigner: Microsoft Corporation

Description

Heap-based buffer overflow in Windows USB Mass Storage Class Driver allows an unauthorized attacker to execute code over a network.

CVSS Scores

EPSS Scores

Probability:
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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

CVE-2026-68839

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_usb_mass_storage_class_driver	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-20	The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
CWE-122	A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

Attack-Flow Graph

Executive Summary

This is a heap-based buffer overflow vulnerability in the Windows USB Mass Storage Class Driver. It allows an unauthorized attacker to execute arbitrary code over a network by exploiting a flaw in memory handling.

Impact Analysis

An attacker could exploit this to run malicious code on your system remotely, potentially gaining control over your device. This could lead to data theft, installation of malware, or disruption of services.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR and HIPAA requirements for data protection and confidentiality. Organizations may face compliance penalties if exploited.

Mitigation Strategies

Apply the latest security updates from Microsoft for the Windows USB Mass Storage Class Driver. Disable unnecessary USB mass storage devices if not required. Monitor network traffic for unusual activity related to USB drivers.

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