Here’s a current summary of the KB5058405 issue and Microsoft’s emergency response as confirmed by both Forbes and discussions in technical forums:
What happened?
- The Windows 11 May 13, 2025, security update (KB5058405) has failed for some users, causing unbootable systems and recovery errors — especially with the message that “your PC/Device needs to be repaired,” typically accompanied by error code 0xc0000098.
- This is linked to the ACPI.sys driver (responsible for hardware resource and power management). In some cases, other file errors appear as well.
- The problem is most severe in virtual environments—Azure Virtual Machines, Azure Virtual Desktop, on-premises systems with Citrix or Hyper-V—though some physical devices are also impacted.
- Microsoft has acknowledged the severity of the issue. They state that they “plan to release an out-of-band update in the coming days” to fix the boot failure and installation problems.
- The company is currently guiding affected users (especially enterprises using virtual environments) toward VM repair and recovery options, pending release of the emergency fix.
- This follows a similar pattern to this month’s earlier issue, where a BitLocker loop affected Windows 10 users and was resolved with an out-of-band patch .
- If you see the ACPI.sys error (or boot failure with code 0xc0000098) immediately after applying KB5058405, and particularly if running on virtualized hardware, your best course is to avoid further update or restore actions until the out-of-band patch is available.
- For enterprise/VM users: Microsoft support and platform-specific documentation (Azure, Citrix) offer short-term recovery steps—such as using management consoles to repair the VM startup environment.
- Microsoft’s forthcoming emergency patch aims to resolve the ACPI.sys and related update/boot errors for the affected machines.
- Monitor Microsoft’s official channels (Windows Release Health, Azure Status, and Windows Update pages) for the update release and further instructions.
- For now, avoid attempting manual workarounds unless guided by official support—especially on critical or virtualized systems.
Sources:
- Forbes coverage
- Windows Forum posts: Reports and analysis of the KB5058405 failure, ACPI.sys errors, and ongoing enterprise/VM impact .
Source: Forbes Microsoft Warns Windows Users—Emergency Update Within Days
