Microsoft December Updates Break the Creation of Virtual Machines in Hyper-V

Microsoft December Updates
Written by Emma Davis

Microsoft developers have warned that updates for Windows Server released as part of the December “Update Tuesday” may cause errors when creating new virtual machines on some Hyper-V hosts.

Let me remind you that we also reported that In December, Microsoft Fixed 49 Vulnerabilities and Two 0-Day Attacks, and also that Microsoft Developers Fixed a Critical Bug in Azure Cosmos DB.

The issue is reported to only affect Windows Server/AzStack HCI hosts in SDN-enabled environments managed by System Center Virtual Machine Manager (SCVMM).

You may see an error message while performing tasks related to creating a new Network Adapter (Network Interface Card or NIC) attached to a network of virtual machines, or a new virtual machine with a Network Adapter attached to a network of virtual machines.explains Microsoft.

Microsoft experts stressed that the bug does not affect existing virtual machines and network adapters, and only applies to those created after installing the problematic update.

The company also believes that the problem only affected Windows Server 2019 and Windows Server 2022 with packages KB5021237 and KB5021249 installed.

VMM VersionHyper-V patched KB5021249/KB5021237SDN enabledAffected
VMM 20192012 R2, 2016, 2019, HCI 21H2NoNo
VMM 20192012 R2, 2016YesNo
VMM 20192019, HCI 21H2YesYes
VMM 20222016, 2019, 2022, HCI 22H2NoNo
VMM 20222016YesNo
VMM 20222019, 2022, HCI 22H2YesYes

Microsoft developers assure that they are already working on fixing the bug, but in the meantime, administrators are invited to use the workaround to solve the problem, detailed in the support team.

Also the media wrote, 0-Day Bug Was Found in Microsoft Exchange, and LockBit Ransomware Operators Are Exploiting It.

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About the author

Emma Davis

I'm writer and content manager (a short time ago completed a bachelor degree in Marketing from the Gustavus Adolphus College). For now, I have a deep drive to study cyber security.

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