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Microsoft Windows 11 25H2 Update Version OS Builds 26200.9445 and 26100.9445

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Update Summary

KB5124008 updates Windows 11 25H2 with security improvements, Secure Boot certificate deployment, and quality fixes for mouse, personalization, Teams and Outlook on Arm64, Remote Desktop audio redirection, and OMA-DM logging. Reference IDs: KB5120998, KB5124007.

Update Details

Security

  • Security updates provide protections for resolved vulnerabilities.
  • Secure Boot certificate deployment is expanded to increase coverage on eligible devices.

Bug Fixes

  • Fixed customized mouse cursor settings, including pointer style and color, not displaying correctly.
  • Fixed desktop background and other personalization settings sometimes not loading correctly, which could leave the background black.
  • Fixed Microsoft Teams and Microsoft Outlook unexpectedly closing on Arm64-based PCs.
  • Fixed Remote Desktop audio redirection issues that could prevent remote audio from playing locally in some configurations.
  • Improved OMA-DM client diagnostic logging to help troubleshoot device management server connection issues.

New Features

  • Updates AI components to version 1.2608.951.0 for Image Search, Content Extraction, Semantic Analysis, and Settings Model.

Hints

  • Includes servicing stack update KB5124007 (Build 26100.9441) to improve Windows Update installation reliability.
  • If previous updates are already installed, only the new updates in this package will be downloaded and installed.
  • Microsoft says Secure Boot certificates used by most Windows devices started expiring in June 2026 and will continue to be deployed through Windows Update.
  • Windows 11 version 24H2 Home and Pro editions reach end of updates on October 13, 2026; Enterprise and Education editions remain supported until October 12, 2027.

Product Information

Vendor: Microsoft

Product: Windows 11

Product type: Software

Application category: Utilities

Platform: Windows

Variant: 25H2

Version: OS Builds 26200.9445 and 26100.9445

Vendor release date: Sep 8, 2026

Original release notes: View on vendor site

Published on updatealert.io: Sep 9, 2026

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

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