Security News > 2023 > November > Microsoft fixes Windows Server VMs broken by October updates
Microsoft fixed a known issue causing blue screens and boot failures in Windows Server 2022 virtual machines deployed on VMware ESXi hosts.
The company confirmed the issue days later, saying it only affects guest VMs on VMware ESXi hosts with an AMD Epyc physical processor, the "Expose IOMMU to guest OS" VMware option toggled on, and Virtualization Based Security and System Guard Secure Launch enabled in Windows Server 2022.
As Microsoft revealed during this month's Patch Tuesday, the root cause has now been addressed with the release of the KB5032198 Windows Server 2022 cumulative update.
In January and December 2022, Microsoft released out-of-band Windows Server updates to resolve issues blocking Hyper-V VMs from booting and causing problems when creating new VMs on specific hosts.
Earlier this year, Microsoft acknowledged a similar issue impacting VMware ESXi VMs with Secure Boot enabled after the installation of February 2023 cumulative updates.
Microsoft shares temp fix for broken Windows Server 2022 VMs. October Windows Server updates cause Hyper-V VM boot issues.
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