The Update BureauKB5061979: Cumulative update for Windows 10, versions 21H2 and 22H2, May 2025. Hyper-V fix stops confidential VMs from hanging or restarting
Fixes an issue that could make confidential virtual machines on Hyper-V stop responding or restart unexpectedly, affecting service availability. CJK text can still look blurry in some browsers at 96 DPI.
Does it affect you? Applies to: This update applies to Windows 10, version 21H2 Enterprise LTSC 2021 and IoT Enterprise LTSC 2021, and Windows 10, version 22H2.
What changes
Improvements 2 changes
Windows 10, version 22H2
For: Devices running Windows 10, version 22H2
- This version includes the improvements listed for supported Windows 10, version 21H2 editions.1
Servicing stack
-
The component that installs Windows updates receives quality improvements.2
The latest servicing stack update is combined with the latest cumulative update.
Fixes 2 changes
Hyper-V Platform
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Confidential virtual machines could stop responding or restart unexpectedly, disrupting service and requiring manual intervention. Azure confidential VMs were primarily affected.3
Fixes an issue in the direct send path for a guest physical address (GPA) on confidential virtual machines running on Hyper-V with Windows Server 2022.
-
Confidential virtual machines could stop responding or restart unexpectedly, disrupting service and requiring manual intervention. Azure confidential VMs were primarily affected.3
Fixes an issue in the direct send path for a guest physical address (GPA) on confidential virtual machines running on Hyper-V with Windows Server 2022.
Known issues
Technical details
Data sheet · Security · Downloads · Components Click to collapse or expand
Data sheet
- Released
- 2025-05-27
- Classification
- Updates
- Type
- Cumulative update
- Restart
- Required
- Replaces
- KB5061768, KB5055612, KB5053643, KB5052077
- Replaced by
- KB5063159
| Version | Build | Channel |
|---|---|---|
| 21H2 | 19044.5859 | General availability |
| 22H2 | 19045.5859 | General availability |
Security
No vulnerabilities are listed for this update.
Downloads (Microsoft Update Catalog)
Updated components
15 files changed since the previous update for the same versions.
Sources
Cited passages from Microsoft's official notes (4)
-
1.
This build includes all the improvements from the supported Windows 10, version 21H2 editions.
support.microsoft.com -
2.
This update makes quality improvements to the servicing stack, which is the component that installs Windows updates.
support.microsoft.com -
3.
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.
support.microsoft.com -
4.
Increasing the display scaling improves clarity by enhancing text rendering.
support.microsoft.com
Checked automatically: 8 of 8 checks passed, 4 quoted passages · compared with Microsoft's page on Oct 20, 2026
- Quotes found in the official pages: passed
- Numbers found in the sources: passed
- Vulnerabilities from the dossier only: passed
- Links to allowed domains only: passed
- Every official change covered: passed
- Readable plain text: passed
- Changes confirmed by the file list: passed
- Sources agree: passed
A second AI read the text against the sources: correctness 5/5, clarity 4/5, completeness 5/5. How we work
Published by The Update Bureau. Written with AI from Microsoft's own documents, checked by rules and a second AI. How we work · Report a mistake