Security News > 2023 > October > October Windows Server updates cause Hyper-V VM boot issues
According to complaints from Windows admins, the issue is triggered after installing KB5031361 and KB5031364 on Windows Server 2019 and Windows Server 2022 systems.
When it released the buggy cumulative updates, the company revised the support document for KB5031364, including and removing a known issue related to VMware ESXi, describing boot issues encountered by guest VMs operating Windows Server 2022 with Secure Boot enabled.
"After installing this update on guest virtual machines running Windows Server 2022 on some versions of VMware ESXi, Windows Server 2022 might not start up," the now-removed known issue said.
"Only Windows Server 2022 VMs with Secure Boot enabled are affected by this issue. Affected versions of VMware ESXi are versions vSphere ESXi 7.0.x and below."
Redmond also released emergency out-of-band Windows Server updates in January and December 2022 to fix known issues that caused Hyper-V VMs to no longer start and problems creating new VMs on some Hyper-V hosts.
VMware issued emergency vSphere ESXi updates that fixed a bug causing boot issues after failing to locate a bootable operating system.
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