Microsoft Windows 11 25H2 Update Version OS Builds 26200.8655 and 26100.8655

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.

• 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.

• Fixed a virtualization issue that could cause HYPERVISOR_ERROR (0x20001) and KMODE_EXCEPTION_NOT_HANDLED (0x1E) after installing KB5089573 during restarts, virtual machine operations, or some gaming applications.

• 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: Other

Application category: Utilities

Platform: Windows

Variant: 25H2

Version: OS Builds 26200.8655 and 26100.8655

Vendor release date: Jun 9, 2026

Published on updatealert.io: Jun 10, 2026

Description: Client operating system for modern desktop and enterprise environments.