Hyper-V VMs using pass-through disks do not boot after installing VirusScan Enterprise 8.8 Patch 5

Technical Articles ID: KB84987
Last Modified: 1/24/2020

McAfee VirusScan Enterprise (VSE) 8.8 Patch 5

Microsoft Hyper-V

VM systems that use the Hyper-V platform with pass-through disks might not boot after VSE 8.8 Patch 5 is installed.

You installed VSE 8.8 Patch 5.

This issue is resolved in VSE 8.8 Patch 6.

Patches are cumulative; Technical Support recommends that you install the latest one.

Updates are available when you log on to the ServicePortal at: https://support.mcafee.com/downloads.

Disable the mfedisk.sys driver in the registry:

CAUTION: This article contains information about opening or modifying the registry.

The following information is intended for System Administrators. Registry modifications are irreversible and could cause system failure if done incorrectly.
Before proceeding, Technical Support strongly recommends that you back up your registry and understand the restore process. For more information, see: http://support.microsoft.com/kb/256986.
Do not run a REG file that is not confirmed to be a genuine registry import file.

Back up your registry.
Navigate to the following key, and modify the UpperFilters value by removing ONLY mfedisk in the string:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4d36e967-e325-11ce-bfc1-08002be10318}
Reboot the system.

Known Issue/Product Defect
VirusScan Enterprise 8.8

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