Alternate operating systems must not be permitted on the same system.

From Windows 10 Security Technical Implementation Guide

Associated with: CCI-000366

SV-77845r1_rule Alternate operating systems must not be permitted on the same system.

Vulnerability discussion

Allowing other operating systems to run on a secure system may allow security to be circumvented.

Check content

Verify the system does not include other operating system installations. Run "Advanced System Settings". Select the "Advanced" tab. Click the "Settings" button in the "Startup and Recovery" section. If the drop-down list box "Default operating system:" shows any operating system other than Windows 10, this is a finding.

Fix text

Ensure Windows 10 is the only operating system on a device. Remove alternate operating systems.

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