CVE-2026-27929
Received Received - Intake
TOCTOU Race Condition in Windows LUAFV Enables Local Privilege Escalation

Publication date: 2026-04-14

Last updated on: 2026-04-22

Assigner: Microsoft Corporation

Description
Time-of-check time-of-use (toctou) race condition in Windows LUAFV allows an authorized attacker to elevate privileges locally.
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Meta Information
Published
2026-04-14
Last Modified
2026-04-22
Generated
2026-06-16
AI Q&A
2026-04-14
EPSS Evaluated
2026-06-14
NVD
CVE-2026-27929
EUVD
EUVD-2026-22483
Affected Vendors & Products
Showing 25 associated CPEs
Vendor Product Version / Range
microsoft windows_server_2012 r2
microsoft windows_server_2012 *
microsoft windows_10_1607 to 10.0.14393.9060 (exc)
microsoft windows_10_1607 to 10.0.14393.9060 (exc)
microsoft windows_10_1809 to 10.0.17763.8644 (exc)
microsoft windows_10_1809 to 10.0.17763.8644 (exc)
microsoft windows_10_21h2 to 10.0.19044.7184 (exc)
microsoft windows_10_21h2 to 10.0.19044.7184 (exc)
microsoft windows_10_21h2 to 10.0.19044.7184 (exc)
microsoft windows_10_22h2 to 10.0.19045.7184 (exc)
microsoft windows_10_22h2 to 10.0.19045.7184 (exc)
microsoft windows_10_22h2 to 10.0.19045.7184 (exc)
microsoft windows_11_23h2 to 10.0.22631.6936 (exc)
microsoft windows_11_23h2 to 10.0.22631.6936 (exc)
microsoft windows_11_24h2 to 10.0.26100.8246 (exc)
microsoft windows_11_24h2 to 10.0.26100.8246 (exc)
microsoft windows_11_25h2 to 10.0.26200.8246 (exc)
microsoft windows_11_25h2 to 10.0.26200.8246 (exc)
microsoft windows_11_26h1 to 10.0.28000.1836 (exc)
microsoft windows_11_26h1 to 10.0.28000.1836 (exc)
microsoft windows_server_2016 to 10.0.14393.9060 (exc)
microsoft windows_server_2019 to 10.0.17763.8644 (exc)
microsoft windows_server_2022 to 10.0.20348.5020 (exc)
microsoft windows_server_2022_23h2 to 10.0.25398.2274 (exc)
microsoft windows_server_2025 to 10.0.26100.32690 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-367 The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check.
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Impact Analysis

An attacker who is already authorized on the system can exploit this vulnerability to gain higher privileges than intended. This elevation of privilege can lead to unauthorized access to sensitive system functions and data.

Executive Summary

This vulnerability is a time-of-check time-of-use (toctou) race condition found in Windows LUAFV. It allows an authorized attacker to elevate their privileges locally on the affected system.

Mitigation Strategies

This vulnerability allows an authorized attacker to elevate privileges locally due to a time-of-check time-of-use (toctou) race condition in Windows LUAFV.

To mitigate this vulnerability, it is recommended to apply the security updates provided by Microsoft as soon as possible.

Compliance Impact

This vulnerability allows an authorized attacker to elevate privileges locally on Windows systems due to a time-of-check time-of-use (toctou) race condition in Windows LUAFV.

Elevation of privilege vulnerabilities can potentially impact compliance with standards and regulations such as GDPR and HIPAA by increasing the risk of unauthorized access to sensitive data or systems.

However, the provided information does not specify direct effects or assessments related to compliance with these standards.

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