Windows Server has addressed critical Hyper-V issues through an emergency update aimed at resolving unexpected shutdowns of virtual machines. Administrators faced significant disruptions with Windows Server 2022 after a recent patch caused Azure VMs to shut down and restart unpredictably.
The underlying problem originated from a bug in the direct broadcast path for the physical guest address (GPA). This glitch often caused confidential virtual machines under Hyper-V to become unresponsive or to restart unexpectedly, significantly hampering availability and requiring manual intervention. Microsoft acknowledged the seriousness of the issue, noting its potential to disrupt entire networks.
In response, Microsoft released a cumulative out-of-band update named KB5061906. This update replaces all previous updates for Windows Server 2022 and aims to fix the aforementioned problems. However, it is crucial to note that this update will not install automatically via Windows Update. Administrators are required to manually download the update from the Microsoft Update Catalog.
Microsoft also recommends installing the KB5061906 update, especially for environments using Windows Server 2022 devices with Hyper-V that have not yet integrated the May 2025 security update (KB5058385).
Key elements of the KB5061906 release include the resolution of the aforementioned Hyper-V issue and improvements to the maintenance stack for Windows Server 2022. It’s advisable for users operating Hyper-V on Windows Server 2022 to check their systems and apply the update accordingly to avoid further disruptions.
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