CVE-2026-27929: CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition in Microsoft Windows 10 Version 1607
Time-of-check time-of-use (toctou) race condition in Windows LUAFV allows an authorized attacker to elevate privileges locally.
AI Analysis
Technical Summary
This vulnerability involves a TOCTOU race condition in the Windows LUAFV component on Windows 10 Version 1607 (build 10.0.14393.0). An authorized local attacker could exploit this flaw to elevate their privileges, potentially gaining higher-level access than intended. The issue is tracked as CVE-2026-27929 and classified under CWE-367. Microsoft has published an official fix to remediate the vulnerability.
Potential Impact
Successful exploitation of this vulnerability allows an authorized local attacker to elevate privileges on the affected Windows 10 Version 1607 system. This could lead to unauthorized actions being performed with elevated rights, impacting confidentiality, integrity, and availability of the system. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft for this vulnerability. It is recommended to apply the security update provided by Microsoft as detailed in their advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-27929. Applying this patch will remediate the TOCTOU race condition and prevent privilege escalation via this vector.
CVE-2026-27929: CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition in Microsoft 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
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves a TOCTOU race condition in the Windows LUAFV component on Windows 10 Version 1607 (build 10.0.14393.0). An authorized local attacker could exploit this flaw to elevate their privileges, potentially gaining higher-level access than intended. The issue is tracked as CVE-2026-27929 and classified under CWE-367. Microsoft has published an official fix to remediate the vulnerability.
Potential Impact
Successful exploitation of this vulnerability allows an authorized local attacker to elevate privileges on the affected Windows 10 Version 1607 system. This could lead to unauthorized actions being performed with elevated rights, impacting confidentiality, integrity, and availability of the system. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft for this vulnerability. It is recommended to apply the security update provided by Microsoft as detailed in their advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-27929. Applying this patch will remediate the TOCTOU race condition and prevent privilege escalation via this vector.
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: 4/14/2026, 5:32:20 PM
Last enriched: 5/19/2026, 10:39:35 AM
Last updated: 5/30/2026, 10:03:09 AM
Views: 111
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