Microsoft releases emergency update to address Windows Server Hyper-V virtual machine issue

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Ngày cập nhật gần nhất: 15/4/2026

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Microsoft adds an urgent fix for Windows Server Hyper-V virtual machines

Microsoft has just rolled out out-of-band (OOB) emergency updates for Windows Server to fix issues with Windows virtual machines. It is reported that the virtual machine (VM) creation process on Hyper-V servers broke after applying this month's Patch Tuesday update.

This issue specifically impacts virtual machines managed by System Center Virtual Machine Manager (SCVMM) and utilizing Software Defined Networking (SDN).

Microsoft adds an urgent fix for Windows Server Hyper-V virtual machines

On affected systems, Windows Server administrators will receive direct alerts during the virtual machine migration process, SLB Load Balancer, or SDN RAS Gateway failures. Additionally, they may encounter errors when creating new virtual machines with attached Virtual Network Interface Cards (VNICs).

However, only Windows Server 2019 and Windows Server 2022 are impacted after applying the December 2022 Patch Tuesday updates (KB5021237 and KB5021249).

If you're not familiar with Windows Server, and want to understand the differences between regular Windows operating systems and Windows Server, detailed information is available in the article below.

Learn about: Windows Server

To resolve this issue, administrators must install the out-of-band updates released today for their systems on all affected Hyper-V servers. Additionally, Microsoft emphasizes that users do not need to install any updates or make any changes to other servers or client devices to address this problem.

Today's out-of-band updates are not distributed through Windows Updates and won't install automatically on affected servers. To download individual updates, users need to search by KB number in the Microsoft Update Catalog, then manually download and install them.

Users can manually upload these updates to Windows Server Update Services (WSUS) and Microsoft Endpoint Configuration Manager. Additionally, the tech giant provides guidance on how to download updates into WSUS and Configuration Manager from the Microsoft Update Catalog.

The list of emergency updates for Windows Server released today includes:

- Windows Server 2022: KB5022553
- Windows Server 2019: KB5022554

In addition, Microsoft states that users can directly install these two updates to fix the issue without uninstalling previously problematic updates. A temporary fix is also released for admins who cannot immediately install today's patches on affected SCVMM-based SDN deployments.

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