Microsoft has released an out-of-band update to fix startup failures in Windows 11 systems caused by the KB5058405 security update. The issue primarily affects enterprise virtual environments like Azure Virtual Machines and Hyper-V, prompting Microsoft to provide mitigation steps and additional updates. #KB5058405 #ACPI.sys #AzureVirtualMachines #Hyper-V
Keypoints
- Microsoft issued an emergency update to resolve Windows 11 startup issues caused by KB5058405.
- The problem results in recovery errors related to the ACPI.sys driver, affecting virtual machine environments.
- Most affected systems are virtual machines in enterprise environments, not home PCs.
- Microsoft recommends manual patching and using Azure repair commands for affected users.
- An additional mitigation update (KB5062170) is available for manual installation to address the issue.