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

Publication date: 2026-06-09

Last updated on: 2026-06-11

Assigner: Microsoft Corporation

Description
Windows Universal Disk Format File System Driver (UDFS) Elevation of Privilege Vulnerability

CVSS Scores

EPSS Scores

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Meta Information

Published
2026-06-09
Last Modified
2026-06-11
Generated
2026-06-30
AI Q&A
2026-06-10
EPSS Evaluated
2026-06-28
NVD
CVE-2026-40409
EUVD
EUVD-2026-35655

Affected Vendors & Products

Showing 24 associated CPEs
Vendor Product Version / Range
microsoft windows_server_2012 r2
microsoft windows_server_2012 *
microsoft windows_10_1607 to 10.0.14393.9234 (exc)
microsoft windows_10_1607 to 10.0.14393.9234 (exc)
microsoft windows_10_1809 to 10.0.17763.8880 (exc)
microsoft windows_10_1809 to 10.0.17763.8880 (exc)
microsoft windows_10_21h2 to 10.0.19044.7417 (exc)
microsoft windows_10_21h2 to 10.0.19044.7417 (exc)
microsoft windows_10_21h2 to 10.0.19044.7417 (exc)
microsoft windows_10_22h2 to 10.0.19045.7417 (exc)
microsoft windows_10_22h2 to 10.0.19045.7417 (exc)
microsoft windows_10_22h2 to 10.0.19045.7417 (exc)
microsoft windows_11_23h2 to 10.0.22631.7219 (exc)
microsoft windows_11_23h2 to 10.0.22631.7219 (exc)
microsoft windows_11_24h2 to 10.0.26100.8655 (exc)
microsoft windows_11_24h2 to 10.0.26100.8655 (exc)
microsoft windows_11_25h2 to 10.0.26200.8655 (exc)
microsoft windows_11_25h2 to 10.0.26200.8655 (exc)
microsoft windows_11_26h1 to 10.0.28000.2269 (exc)
microsoft windows_11_26h1 to 10.0.28000.2269 (exc)
microsoft windows_server_2016 to 10.0.14393.9234 (exc)
microsoft windows_server_2019 to 10.0.17763.8880 (exc)
microsoft windows_server_2022 to 10.0.20348.5256 (exc)
microsoft windows_server_2025 to 10.0.26100.32995 (exc)

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.

Attack-Flow Graph

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Mitigation Strategies

To mitigate the Windows Universal Disk Format File System Driver (UDFS) Elevation of Privilege Vulnerability (CVE-2026-40409), it is recommended to apply the security updates provided by Microsoft as soon as possible.

Ensure that your Windows systems are updated with the latest patches from the Microsoft Update Guide.

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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