May 27, 2025—KB5061977 (OS Build 26100.4066) Out-of-band
Applies To
Windows 11 version 24H2, all editionsRelease Date:
27/05/2025
Version:
OS Build 26100.4066
For information about Windows update terminology, see types of Windows updates and the monthly quality update types. To find an overview, see the update history page for Windows 11, version24H2.
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Improvements
This non-security update includes quality improvements. When you install this update:
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[Hyper-V Platform] Fixed: An issue in the direct send path for a guest physical address (GPA) where confidential virtual machines running on Hyper-V with Windows Server 2025 might intermittently stop responding or restart unexpectedly, affecting service availability and requiring manual intervention. This issue primarily affects Azure confidential VMs.
Windows 11 servicing stack update (KB5058523)- 26100.4060
This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. Servicing stack updates (SSU) ensure that you have a robust and reliable servicing stack so that your devices can receive and install Microsoft updates. To learn more about SSUs, see Simplifying on-premises deployment of servicing stack updates.
Known issues in this update
Microsoft is not currently aware of any issues with this update.
How to get this update
Before you install this update
Microsoft combines the latest servicing stack update (SSU) for your operating system with the latest cumulative update (LCU). For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.
Install this update
To install this update, use one of the following Windows and Microsoft release channels.
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Before you install this update To get the standalone package(s) for this update, go to the Microsoft Update Catalog website. This KB contains one or more MSU files that must be installed in order. Install this update Method 1: Install all MSU files together Download all MSU files for KB5055523 from Microsoft Update Catalog and place them in the same folder (for example, C:/Packages). Use Deployment Image Servicing and Management (DISM.exe) to install the target update. DISM will use the folder specified in PackagePath to discover and install one or more prerequisite MSU files as needed. Updating Windows PC To apply this update to a running Windows PC, run the following command from an elevated Command Prompt:
Or, run the following command from an elevated Windows PowerShell prompt:
Updating Windows Installation media To apply this update to Windows Installation media, see Update Windows installation media with Dynamic Update. To add this update to a mounted image, run the following command from an elevated Command Prompt:
Or, run the following command from an elevated Windows PowerShell prompt:
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1 This latest cumulative update includes update for AI components. Even though the AI component updates are included in the update, the AI components are only applicable to Windows Copilot+ PCs and will not install on Windows PC or Windows Server.
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If you want to remove the LCU
To remove the LCU after installing the combined SSU and LCU package, use the DISM/Remove-Package command line option with the LCU package name as the argument. You can find the package name by using this command: DISM /online /get-packages.
Running Windows Update Standalone Installer (wusa.exe) with the /uninstall switch on the combined package will not work because the combined package contains the SSU. You cannot remove the SSU from the system after installation.
File information
For a list of the files in this update, download the file information for cumulative update 5061977.
For a list of the files in the servicing stack update, download the file information for the SSU (KB5058523) - version 26100.4060.
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