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Problem with KB5089573 in Win 11 Hosta and Vmware

Bo Nilsson 20 Reputation points
2026-06-03T12:13:03.4666667+00:00

When kb5089573 is installed in Win 11 host we get problem with Vmware installation, could not update to latest version, and Win 10 machine in Vmware was not working. after un-install of kb, all works at should.

Windows for home | Windows 11 | Install and upgrade

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AI answer

2026-06-03T12:13:23.42+00:00

KB5089573 is a Windows 11 update that also carries a fix for a known issue with update installation on Windows 11 24H2/25H2 devices. The available information in the context does not document any specific incompatibility between KB5089573 and VMware or guest Windows 10 VMs.

However, KB5089573 (or later updates) is explicitly recommended to avoid having to use workarounds related to update/boot issues on Windows 11 24H2/25H2 and 25H2:

  • Installing KB5089573 or any later update removes the need to modify the ESP-related registry setting (EspPaddingPercent) or to rely on Known Issue Rollback (KIR) for that particular issue.
  • If using an update released before KB5089573 and hitting that issue, the documented workarounds are:
    1. Modify the registry to allow update installation:
      • Open Command Prompt as Administrator.
      • Run: 
               reg add "HKLM\SYSTEM\CurrentControlSet\Control\Bfsvc" /v EspPaddingPercent /t REG_DWORD /d 0 /f
      • Restart the device and retry the update.
    2. Use Known Issue Rollback (KIR):
      • For consumer and non-managed devices, the mitigation is delivered automatically; a restart can help apply it.
      • For enterprise-managed devices, IT admins can deploy the KIR Group Policy package (KB5089549) and configure it under Computer Configuration > Administrative Templates.

Given that uninstalling KB5089573 restores VMware functionality in this scenario, the practical options based on the provided documentation are:

  1. Keep KB5089573 uninstalled temporarily if VMware functionality is critical and there is no immediate requirement to apply that specific update.
  2. Monitor for a newer cumulative update (later than KB5089573) that supersedes it and may resolve any side effects.
  3. If managing many devices, consider using KIR/Group Policy (KB5089549) where applicable, as documented, while testing VMware compatibility in a controlled environment before broad deployment.

Any deeper VMware-specific troubleshooting or confirmed incompatibility details are not covered in the provided material.

References:

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  1. Bo Nilsson 20 Reputation points
    2026-06-03T12:23:47.1033333+00:00

    Have uninstalled kb5089593 for the moment so work can continue, have to look in to the problem more.

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