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Microsoft Security Response CenterCVE-2026-85921

Windows Secure Kernel Mode Elevation of Privilege Vulnerability

Double free in Windows Secure Kernel Mode allows an authorized attacker to elevate privileges locally.

Read the vendor bulletin Get alerts for Windows
8.2CVSS out of 10Critical severity
Scope

What the vendor says is affected

  • Windows 11 version 26H1 for x64-based Systems
  • Windows 11 Version 26H1 for ARM64-based Systems

Versions the vendor lists as fixed

  • 10.0.28000.2956
Next step

What the vendor recommends

Install KB5129194.

Review the complete instructions on the vendor's site
Timeline

When this advisory changed

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Updated by Microsoft Security Response Center

    The vendor changed the advisory after it was first published.

  3. Added to SecurityAlert

    We collected the advisory from the official source.

Vulnerabilities

CVEs named in this advisory

CVE-2026-85921View CVSS, KEV, EPSS, and threat context
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