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CVE-2026-27929 Microsoft CVE debrief

A time-of-check time-of-use (toctou) race condition in Windows LUAFV allows an authorized attacker to elevate privileges locally. Multiple Windows versions are affected, including Windows 10, Windows 11, and Windows Server. This vulnerability requires verification of local privilege escalation risk and inventory of Windows versions for exposure. Defenders and administrators of Windows systems should assess exposure and apply patches immediately to prevent potential unauthorized access and local privilege escalation. The CVE Program and NVD provide official records of the vulnerability. Microsoft provides a patch for the vulnerability.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-14
Original CVE updated
2026-10-15
Advisory published
2026-04-14
Advisory updated
2026-10-15

Who should care

Defenders and administrators of Windows systems should assess exposure and apply patches immediately. This vulnerability requires verification of local privilege escalation risk and inventory of Windows versions for exposure.

Why it matters

CVE-2026-27929 is a high-severity vulnerability in Windows LUAFV that allows authorized attackers to elevate privileges locally. Defenders and administrators of Windows systems should assess exposure and apply patches immediately to prevent potential unauthorized access and local privilege escalation.

  • Local privilege escalation risk
  • Potential for unauthorized access
  • Need for immediate patching of affected Windows versions

Technical summary

The Windows LUA File Virtualization Filter Driver Elevation of Privilege Vulnerability (CVE-2026-27929) is a toctou race condition that allows authorized attackers to elevate privileges locally. Multiple Windows versions are affected, including Windows 10, Windows 11, and Windows Server. Microsoft provides patches for this vulnerability.

Defensive priority

Apply patches immediately for Windows LUAFV Elevation of Privilege Vulnerability

Recommended defensive actions

  • Apply patches for Windows LUAFV Elevation of Privilege Vulnerability
  • Inventory Windows versions for exposure
  • Verify local privilege escalation risk

Evidence notes

The CVE Program and NVD provide official records of the vulnerability. Microsoft provides a patch for the vulnerability. The vulnerability affects multiple Windows versions, including Windows 10, Windows 11, and Windows Server. Defenders and administrators of Windows systems should assess exposure and apply patches immediately to prevent potential unauthorized access and local privilege escalation. The official CVE Program record and NVD detail page provide source-provided CVE metadata

Sources and references

Verified primary and authoritative sources

  • CVE-2026-27929 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-27929

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-27929 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-27929

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.