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Windows Server 2019 Windows Server 2019 Out-of-band update
Out-of-band

KB5061978

KB5061978: Cumulative update for Windows Server, version 2019, May 2025. Confidential VM hangs and unexpected restarts fixed

In short

The update fixes intermittent stops and unexpected restarts for confidential virtual machines on Hyper-V with Windows Server 2022, primarily Azure confidential VMs. It is available only from the Update Catalog.

Does it affect you? Applies to: Windows Server 2019 x64 devices. The Hyper-V fix concerns confidential virtual machines running on Hyper-V with Windows Server 2022, primarily Azure confidential VMs.

Build
17763.7322
Restart
Required

Microsoft publishes separate notes for this KB for Windows 10.

What changes

Fix 1 change

Hyper-V Platform

  • The intermittent stops and unexpected restarts affecting confidential virtual machines on Hyper-V with Windows Server 2022 are fixed. Azure confidential VMs were primarily affected.1
    Fixes an issue in the direct send path for a guest physical address (GPA).

Improvement 1 change

Servicing stack

  • The component that installs Windows updates receives quality improvements.2

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
KB5058392, KB5059091, KB5058922, KB5050008, KB5037425
Replaced by
KB5060531
VersionBuildChannel
2019 17763.7322 General availability

Security

No vulnerabilities are listed for this update.

Downloads (Microsoft Update Catalog)

x64 2019
695.4 MB
windows10.0-kb5061978-x64.msu Main update · KB5061978 SHA-1: 8a545c5e…11c057

Updated components

24 files changed since the previous update for the same versions.

Top changed componentsFiles
Kernel2
Graphics and display1
Networking1
Security and sign-in1

Sources

Updated
Cited passages from Microsoft's official notes (2)
  1. 1. 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
  2. 2. This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. support.microsoft.com
Checked automatically: 8 of 8 checks passed, 2 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 4/5. 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