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


Finding ID Version Rule ID IA Controls Severity
V-220709 WN10-00-000055 SV-220709r569187_rule Medium
Allowing other operating systems to run on a secure system may allow security to be circumvented.
Microsoft Windows 10 Security Technical Implementation Guide 2023-09-29


Check Text ( C-22424r554612_chk )
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 (F-22413r554613_fix)
Ensure Windows 10 is the only operating system on a device. Remove alternate operating systems.