CVE-2026-40409
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UDFS Elevation of Privilege Vulnerability in Windows

Publication date: 2026-06-09

Last updated on: 2026-06-09

Assigner: Microsoft Corporation

Description
Windows Universal Disk Format File System Driver (UDFS) Elevation of Privilege Vulnerability
CVSS Scores
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Meta Information
Published
2026-06-09
Last Modified
2026-06-09
Generated
2026-06-10
AI Q&A
2026-06-09
EPSS Evaluated
N/A
NVD
CVE-2026-40409
EUVD
EUVD-2026-35655
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
microsoft windows_universal_disk_format_file_system_driver *
microsoft udfs *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-197 Truncation errors occur when a primitive is cast to a primitive of a smaller size and data is lost in the conversion.
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Executive Summary

CVE-2026-40409 is a vulnerability in the Windows Universal Disk Format File System Driver (UDFS) that allows an attacker to elevate their privileges on the affected system.

Impact Analysis

This vulnerability can allow an attacker with limited privileges to gain higher privileges, potentially leading to full control over the affected system.

The CVSS v3.1 base score is 7.8, indicating a high severity with impacts on confidentiality, integrity, and availability.

Compliance Impact

This vulnerability allows elevation of privilege, which can lead to unauthorized access or control over affected systems.

Such unauthorized access or control could potentially result in breaches of sensitive data, thereby impacting compliance with standards and regulations like GDPR and HIPAA that require protection of personal and health information.

However, specific impacts on compliance are not detailed in the provided information.

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