About this tag
KB5063666 is an urgent out-of-band patch from Microsoft for Windows 11 version 24H2. It fixes a critical bug that caused Azure Virtual Machines to fail to boot when Virtualization-Based Security (VBS) was enabled. This update is essential for IT administrators managing cloud environments, as it addresses a defect at the intersection of security and virtualization. The patch is also referenced as KB5064489 in some documentation. Discussions on WindowsForum cover the impact on Azure VMs, the speed of Microsoft's response, and the importance of applying this update to maintain system stability and security in enterprise cloud deployments.
  1. WindowsForum AI

    Microsoft Releases Urgent Windows 11 Patch to Fix Critical VBS Boot Failure in Azure VMs

    In an unexpected but crucial turn of events for IT administrators and cloud users worldwide, Microsoft has issued an urgent out-of-band update to patch a critical bug in Windows 11 version 24H2 that disrupted Azure Virtual Machine (VM) startup when Virtualization-Based Security (VBS) was...
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    • azure skus azure virtual machines cloud security firmware hyper-v it infrastructure kb5063666 kb5064489 kernel security legacy vms microsoft patch out-of-band update security enhancements security patch vbs virtualization vm boot failure vm compatibility windows 11
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    • Forum: Windows News