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Microsoft Windows 11 23H2 Update Version OS Build 22631.6649

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Update Summary

KB5075941 updates Windows 11 version 23H2 to OS Build 22631.6649 with security fixes, quality improvements, and non-security changes from recent preview releases. It also includes Secure Boot rollout updates and fixes for DWM, File Explorer, graphics, SmartScreen logging, and VSM shutdown/hibernation behavior. Reference IDs: KB5077457, KB5027397.

Update Details

Security

  • Addresses security issues for the Windows operating system.
  • Updates Secure Boot boot manager components on devices with the Windows UEFI CA 2023 certificate and introduces phased delivery of new Secure Boot certificates.
  • Fixes an issue affecting Microsoft Defender SmartScreen Application Reputation (AppRep) event logging used for threat investigations.

Bug Fixes

  • Fixes a Desktop Window Manager (DWM) process restart issue.
  • Fixes File Explorer folder renaming with desktop.ini files so LocalizedResourceName is honored.
  • Fixes a graphics-related dxgmms2.sys system error that could cause KERNEL_SECURITY_CHECK_FAILURE on some GPU configurations.
  • Fixes an issue where some VSM devices could not shut down or hibernate and instead restarted.

New Features

  • Updates Chinese fonts to support the GB18030-2022A character coverage and display standard.

Hints

  • Use EKB KB5027397 to update to Windows 11, version 23H2.
  • Resetting the Secure Boot DB or toggling Secure Boot on/off can trigger a Secure Boot violation; recovery media may be required in rare cases.
  • Windows quality updates now include targeting data to phase Secure Boot certificate delivery based on successful update signals.
  • Windows Update does not include Microsoft Store app updates.

Product Information

Vendor: Microsoft

Product: Windows 11

Product type: Software

Application category: Utilities

Platform: Windows

Variant: 23H2

Version: OS Build 22631.6649

Vendor information published: Feb 10, 2026

Original release notes: View on vendor site

Published on updatealert.io: Jun 3, 2026

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

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