Microsoft Windows 11 25H2 Update Version OS Builds 26200.8655 and 26100.8655
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Update Summary
KB5094126 updates Windows 11 version 25H2 and 24H2 to OS Builds 26200.8655 and 26100.8655. It includes June 2026 security fixes, Secure Boot certificate rollout improvements, and a virtualization fix for stop errors after KB5089573. Reference IDs: KB5089549.
Update Details
Security
- Includes the latest security fixes and improvements from the June 2026 Security Updates guide.
- Secure Boot: adds higher-confidence device targeting data to expand phased delivery of new Secure Boot certificates.
Bug Fixes
- Fixed a virtualization issue that could cause
HYPERVISOR_ERROR (0x20001)andKMODE_EXCEPTION_NOT_HANDLED (0x1E)after installing KB5089573 during restarts, virtual machine operations, or some gaming applications.
Hints
- This cumulative update includes non-security updates from the May 12, 2026 KB5089549 and May 26, 2026 KB5089573 preview releases.
- Devices receive new Secure Boot certificates only after sufficient successful update signals, as part of a controlled phased rollout.
- Windows 11 version 24H2 Home and Pro editions reach end of updates on 2026-10-13; Enterprise and Education remain supported until 2027-10-12.
Product Information
Vendor: Microsoft
Product: Windows 11
Product type: Software
Application category: Utilities
Platform: Windows
Variant: 25H2
Version: OS Builds 26200.8655 and 26100.8655
Vendor release date: Jun 9, 2026
Original release notes: View on vendor site
Published on updatealert.io: Jun 10, 2026
Description: Client operating system for modern desktop and enterprise environments.