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CVE-2026-27929: CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition in Microsoft Windows 10 Version 1607

0
High
VulnerabilityCVE-2026-27929cvecve-2026-27929cwe-367
Published: 04/14/2026 (04/14/2026, 16:57:16 UTC)
Source: CVE Database V5
Vendor/Project: Microsoft
Product: Windows 10 Version 1607

Description

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

CVSS v3.1

Score 7.0high

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Affected software

Microsoft

Windows 10 Version 1607

Affected versions
>=10.0.14393.0 <10.0.14393.9060

Microsoft

Windows 10 Version 1809

Affected versions
>=10.0.17763.0 <10.0.17763.8644

Microsoft

Windows 10 Version 21H2

Affected versions
>=10.0.19044.0 <10.0.19044.7184

Microsoft

Windows 10 Version 22H2

Affected versions
>=10.0.19045.0 <10.0.19045.7184

Microsoft

Windows 11 version 22H3

Affected versions
>=10.0.22631.0 <10.0.22631.6936

Microsoft

Windows 11 Version 23H2

Affected versions
>=10.0.22631.0 <10.0.22631.6936

Microsoft

Windows 11 Version 24H2

Affected versions
>=10.0.26100.0 <10.0.26100.8246

Microsoft

Windows 11 Version 25H2

Affected versions
>=10.0.26200.0 <10.0.26200.8246

Microsoft

Windows 11 version 26H1

Affected versions
>=10.0.28000.0 <10.0.28000.1836

Microsoft

Windows Server 2012

Affected versions
>=6.2.9200.0 <6.2.9200.26026

Microsoft

Windows Server 2012 (Server Core installation)

Affected versions
>=6.2.9200.0 <6.2.9200.26026

Microsoft

Windows Server 2012 R2

Affected versions
>=6.3.9600.0 <6.3.9600.23132

Microsoft

Windows Server 2012 R2 (Server Core installation)

Affected versions
>=6.3.9600.0 <6.3.9600.23132

Microsoft

Windows Server 2016

Affected versions
>=10.0.14393.0 <10.0.14393.9060

Microsoft

Windows Server 2016 (Server Core installation)

Affected versions
>=10.0.14393.0 <10.0.14393.9060

Microsoft

Windows Server 2019

Affected versions
>=10.0.17763.0 <10.0.17763.8644

Microsoft

Windows Server 2019 (Server Core installation)

Affected versions
>=10.0.17763.0 <10.0.17763.8644

Microsoft

Windows Server 2022

Affected versions
>=10.0.20348.0 <10.0.20348.5020

Microsoft

Windows Server 2022, 23H2 Edition (Server Core installation)

Affected versions
>=10.0.25398.0 <10.0.25398.2274

Microsoft

Windows Server 2025

Affected versions
>=10.0.26100.0 <10.0.26100.32690

Microsoft

Windows Server 2025 (Server Core installation)

Affected versions
>=10.0.26100.0 <10.0.26100.32690

AI-Powered Analysis

Machine-generated threat intelligence

AILast updated: 08/15/2026, 13:59:23 UTC

Technical Analysis

This vulnerability is a TOCTOU race condition in the Windows LUAFV component of Windows 10 Version 1607 (build 10.0.14393.0). It allows an authorized local attacker to elevate their privileges by exploiting the timing between checking a condition and using the resource. The issue is tracked as CVE-2026-27929 and is classified under CWE-367. Microsoft has published an official fix for this vulnerability.

Potential Impact

An authorized local attacker can exploit this race condition to elevate privileges, potentially gaining higher-level access on the affected system. This could lead to full system compromise depending on the privileges gained.

Mitigation Recommendations

An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-27929 to remediate this vulnerability.

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Technical Details

Data Version
5.2
Assigner Short Name
microsoft
Date Reserved
2026-02-24T21:35:49.688Z
Cvss Version
3.1
State
PUBLISHED
Remediation Level
official-fix
Vendor Advisory Urls
[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-27929","vendor":"Microsoft"}]

Threat ID: 69de7a2482d89c981fd6ba08

Added to database: 04/14/2026, 17:32:20 UTC

Last enriched: 08/15/2026, 13:59:23 UTC

Last updated: 09/14/2026, 10:01:30 UTC

Views: 192

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