In a crucial move addressing a specific yet significant problem, Microsoft has released an out-of-band update, identified as KB5064489, for Windows 11, version 24##. This emergency patch addresses a critical boot issue affecting certain Azure Virtual Machines, specifically those with Virtualization-Based Security activated. The issue was particularly problematic for non-Trusted Launch General Enterprise VMs running on older SKUs, where a secure kernel initialization error prevented these systems from booting properly. The new update, once applied, ensures that these systems update to OS Build 26100.4656, thus resolving the boot issue and restoring operational functionality. The urgency of this release signals Microsoft’s commitment to maintaining the seamless performance of enterprise systems, which depend heavily on virtual machines for various critical operations.
Importance of the Out-of-Band Update
Microsoft’s decision to deploy this update outside the regular Patch Tuesday schedule underscores the dire need to rectify the situation promptly. Despite the critical nature of the issue, its impact is somewhat contained, affecting a niche subset of users utilizing version 8.0 of Virtualization-Based Security, which is not the default setting for most configurations. As a result, the update is anticipated to influence a relatively limited group but remains vital for those whose operations are impacted. The release of this patch highlights Microsoft’s proactive stance in ensuring minimal disruption to businesses whose configurations rely on these specific setups. It serves as a reminder of the importance for enterprises to monitor and maintain system integrity by applying necessary updates that secure crucial functionalities and enhance overall system stability.
Ensuring Reliable Updates and Community Feedback
Accompanying the main update is a servicing stack update, KB5063666, which brings the build to OS 26100.4651. This component plays a crucial role in ensuring that Windows systems can consistently receive and install future updates, thereby maintaining operational reliability. Microsoft has reported no known issues with this update, yet users are advised to take precautionary measures, such as backing up data before installation. This advice comes in response to community feedback regarding past patch installations that have caused unforeseen complications. For systems that cannot access Windows Update directly, Microsoft provides the option to download the update as an offline package from its Update Catalog. This method ensures all users, regardless of their system constraints, can secure the necessary updates. The initiative stresses the significance of staying informed and prepared to deploy updates, especially within environments relying on virtual machines for critical functions.
