As a result of this month’s Patch Tuesday updates, Microsoft has released emergency out-of-band (OOB) Windows Server updates to address a known issue that affects the creation of virtual machines (VMs) on Hyper-V hosts.
Only VMs managed by System Center Virtual Machine Manager (SCVMM) and using Software Defined Networking (SDN) are affected by the issue.
Administrators on affected systems receive warnings during live migration, SLB Load Balancer or SDN RAS Gateway failures, and problems creating new VMs and attaching Virtual Network Interface Cards (VNICs).
After installing December 2022 Patch Tuesday updates (KB5021237 and KB5021249), only Windows Server 2019 and Windows Server 2022 should be affected.
In order to resolve this issue, administrators must install the OOB cumulative updates released today for their systems on all affected Hyper-V hosts.
In order to resolve this issue, Microsoft said on Tuesday that you do not need to install any updates or make any changes to other servers or clients in your environment.
Windows Update does not deliver OOB updates
Updates delivered today will not be installed automatically on impacted servers through Windows Updates.
You will need to search for the KB number in the Microsoft Update Catalog, download, and install the standalone package.
Windows Server Update Services (WSUS) and Microsoft Endpoint Configuration Manager can also import them manually.
From the Microsoft Update Catalog, updates can also be imported into WSUS and Configuration Manager.
Windows Server cumulative updates released today include:
KB5022553 for Windows Server 2022
KB5022554 for Windows Server 2019
