Caution: Windows 11 Update Corrupts Critical ACPI.sys Driver!

According to an update from Microsoft on the Windows 11 Health Dashboard, the installation of this month’s cumulative update (KB5058405) on Windows 11 versions 22H2 and 23H2 has been found to corrupt the Windows NT core driver, ACPI.sys.

ACPI, or Advanced Configuration and Power Interface, is a critical component for managing processor power states. It governs power efficiency modes such as P-states and C-states, ensuring optimal processor performance within the Windows NT architecture.

Microsoft has confirmed that the latest update for Windows 11 22H2 and 23H2 causes malfunctions in the ACPI driver, thereby disrupting the system recovery process.

Impacted users may encounter error code 0xc00000098 during an automatic Windows recovery attempt following a failed update. The screen will display a message indicating that the system requires repair, with the issue traced to the ACPI.sys driver:

Your PC/Device needs to be repaired
The operating system couldn't be loaded because a required file is missing or contains errors.
File: ACPI.sys
Error code: 0xc0000098

At present, there is no temporary workaround, and Microsoft is actively investigating the issue and developing a fix. Fortunately, the problem is unlikely to affect personal or home users. According to Microsoft, the bug primarily impacts systems operating in virtualized environments, such as Microsoft Azure virtual machines, Azure Virtual Desktop instances, or local VMs hosted on platforms like Citrix and Hyper-V.

Users running Windows 11 in a virtualized setup and considering the latest update are advised to delay installation until Microsoft releases a resolution.

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