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) and KMODE_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

Version: OS Builds 26200.8655 and 26100.8655

Release date: Jun 9, 2026

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