Microsoft has released an out-of-band (OOB) cumulative update KB5061906 for Windows Server 2022. This update specifically addresses critical issues impacting Hyper-V virtual machines, especially Azure Confidential VMs, which were experiencing unexpected freezes, reboots, and VM startup failures. The problems could lead to VM instability and service disruptions.

Key points about KB5061906 update:

  • It resolves Hyper-V VM freezing and reboot issues on Windows Server 2022.
  • It targets Azure Confidential VMs that require strong data privacy and security.
  • It addresses a flaw in the direct send path in the network stack which could cause VM crashes.
  • It is an emergency fix released outside the regular update cycle and must be manually installed.
  • Microsoft recommends immediate deployment on affected servers to restore VM stability.
  • The update improves virtualization security and system stability for Hyper-V and VMs.

Administrators running Windows Server 2022 with Hyper-V are advised to prioritize installing KB5061906 to mitigate the freezing and rebooting problems affecting their virtual machines.

For manual installation, the update can be downloaded from the Microsoft Update Catalog and applied through normal deployment tools.

This patch highlights Microsoft's proactive response to critical virtualization bugs that impact enterprise server environments relying on Hyper-V to run virtual workloads securely and reliably.

If you are managing Windows Server 2022 Hyper-V environments, applying KB5061906 should be an immediate priority to restore stable VM operations.

Let me know if you want detailed instructions on downloading or installing this update.