KB5021249

Earlier this month, Microsoft released the KB5021237 and KB5021249 updates which it later confirmed were causing Hyper-V issues for some users.

Now the company has now released a pair of out-of-band patches to address the virtual machine problems. The KB5022553 and KB5022554 updates have been issued as emergency fixes for affected systems.

There are few Patch Tuesdays that are not swiftly followed by the discovery of problems caused by the updates that have been released. This December is no different.

Microsoft has confirmed that after installing the KB5021249 update, some users may experience a range of problems with virtual machines on some Hyper-V hosts.