Windows 10 KB5061979 (OS Builds 19044.5859 and 19045.5859) Out-of-band released

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Microsoft has released an out-of-band update, KB5061979, for Windows 10 versions 21H2, specifically targeting the Enterprise LTSC 2021 and IoT Enterprise LTSC 2021 editions. This update addresses a critical issue related to the direct send path for guest physical addresses (GPA), which caused confidential virtual machines operating on Hyper-V with Windows Server 2022 to become unresponsive or restart unexpectedly. This issue particularly affected Azure confidential VMs, leading to disruptions in service and necessitating manual intervention.

The update also includes security and quality enhancements from previous updates, KB5058379 and KB5061768, further improving the overall system performance and reliability. Notably, it integrates the latest servicing stack update (SSU) to enhance the update process and improve the servicing stack, which is responsible for installing Windows updates.

For users running Windows 10 version 22H2, a similar update process applies, ensuring all improvements from version 21H2 are also available. Both updates are accessible for download and installation on compatible systems.

To ensure systems remain secure, users are encouraged to refer to the Microsoft Security Update Guide and the May 2025 Security Updates for further details on vulnerabilities.

In summary, KB5061979 and its associated updates provide essential fixes and enhancements that bolster the stability and security of Windows 10 systems, particularly those running critical workloads on Hyper-V. Users should regularly check for updates to maintain optimal system performance and security.

Furthermore, Microsoft emphasizes the importance of keeping the servicing stack updated as it plays a crucial role in facilitating smooth updates and minimizing potential installation issues. As technology continues to evolve, ongoing updates and improvements like these are vital for maintaining system integrity and performance in enterprise environments

Windows 10 KB5061979 (OS Builds 19044.5859 and 19045.5859) Out-of-band released

Microsoft has issued two out-of-band updates for Windows 10 Enterprise LTSC 2021 and Windows 10 IoT Enterprise LTSC 2021. The initial update resolves a problem in the direct send path for a guest physical address (GPA), which led to confidential virtual machines operating on Hyper-V with Windows Server 2022 intermittently becoming unresponsive or restarting unexpectedly. The second update encompasses enhancements in security and quality that were included in updates KB5058379 and KB5061768. The revised edition encompasses all enhancements from the supported Windows 10 version 21H2 editions. The third update integrates the most recent servicing stack update (SSU) for your operating system with the latest cumulative update (LCU). This enhancement boosts the reliability of the update process and introduces quality improvements to the servicing stack responsible for installing Windows updates. The update is now accessible for download and installation on compatible editions.

Windows 10 KB5061979 (OS Builds 19044.5859 and 19045.5859) Out-of-band released @ NT Compatible