May 27, 2025—KB5061979 (OS Builds 19044.5859 and 19045.5859) Out-of-band - Microsoft Support
This article lists the fixed issues and quality improvements included in this out-of-band update.
Windows 10, version 21H2
Applies to: Windows 10 Enterprise LTSC 2021 and Windows 10 IoT Enterprise LTSC 2021
Important: Use EKB KB5003791 to update to Windows 10, version 21H2 on supported editions.
This update includes security and quality improvements that were a part of updates KB5058379 (released May 13, 2025) and KB5061768 (released May 19, 2025). The following is a summary of the fixed issues and quality improvements included in this out-of-band update. If there are new features, it lists them as well. The bold text within the brackets indicates the item or area of the change we are documenting.
[Hyper-V Platform] Fixed: An issue in the direct send path for a guest physical address (GPA). This issue caused confidential virtual machines running on Hyper-V with Windows Server 2022 to intermittently stop responding or restart unexpectedly. As a result, service availability was affected, and manual intervention was required. This problem primarily impacted Azure confidential VMs
If you installed earlier updates, only the new updates contained in this package will be downloaded and installed on your device.
For information about security vulnerabilities, please refer to the new Security Update Guide website and the May 2025 Security Updates.
Windows 10, version 22H2
Important: Use EKB KB5015684 to update to Windows 10, version 22H2.
This update includes security and quality improvements that were a part of updates KB5058379 (released May 13, 2025) and KB5061768 (released May 19, 2025). The following is a summary of the fixed issues and quality improvements included in this out-of-band update. If there are new features, it lists them as well. The bold text within the brackets indicates the item or area of the change we are documenting.
This build includes all the improvements from the supported Windows 10, version 21H2 editions.
[Hyper-V Platform] Fixed: An issue in the direct send path for a guest physical address (GPA). This issue caused confidential virtual machines running on Hyper-V with Windows Server 2022 to intermittently stop responding or restart unexpectedly. As a result, service availability was affected, and manual intervention was required. This problem primarily impacted Azure confidential VMs
If you installed earlier updates, only the new updates contained in this package will be downloaded and installed on your device.
For information about security vulnerabilities, please refer to the new Security Update Guide website and the May 2025 Security Updates.
Windows 10 servicing stack update (KB5058526) - 19044.5853 and 19045.5853
Microsoft now combines the latest servicing stack update (SSU) for your operating system with the latest cumulative update (LCU). SSUs improve the reliability of the update process to mitigate potential issues while installing updates.
This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. To learn more about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.
May 27, 2025—KB5061979 (OS Builds 19044.5859 and 19045.5859) Out-of-band - Microsoft Support
Microsoft has issued two out-of-band updates for Windows 10 Enterprise LTSC 2021 and Windows 10 IoT Enterprise LTSC 2021. The initial update resolves a problem in the direct send path for a guest physical address (GPA), which led to confidential virtual machines operating on Hyper-V with Windows Server 2022 intermittently becoming unresponsive or restarting unexpectedly. The second update encompasses enhancements in security and quality that were included in updates KB5058379 and KB5061768. The revised edition encompasses all enhancements from the supported Windows 10 version 21H2 editions. The third update integrates the most recent servicing stack update (SSU) for your operating system with the latest cumulative update (LCU). This enhancement boosts the reliability of the update process and introduces quality improvements to the servicing stack responsible for installing Windows updates. The update is now accessible for download and installation on compatible editions.
