Microsoft Windows 11 Security Technical Implementation Guide

The Microsoft Windows 11 Security Technical Implementation Guide (V2 R11) has 257 STIG checks. New to STIG checklists? Read What is a STIG checklist?, CKL vs CKLB, and STIG vs SCAP benchmark.

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Severity

Version

V2 · R11

CurrentPublished Wed Sep 30 2026

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

Microsoft Windows 11 Security Technical Implementation Guide

Assessment Title

Rule Text

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

Description

Discussion Text

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

New to STIG checklists? Read What is a STIG checklist? and CKL vs CKLB.

Objective

V-253266

Rule

SV-253266r1268251_rule

Severity

medium

Rule Version

WN11-00-000055

Documentable

false

IA Controls

NIST SP 800-53

Rev 5

Assessment Procedure

Check Text

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 11, this is a finding.

Implementation Procedure

Fix Text

Ensure Windows 11 is the only operating system on a device. Remove alternate operating systems.

STIG check 12 of 257 in the Microsoft Windows 11 STIG checklist

← Previous · V-253265Local volumes must be formatted using NTFS.Next · V-253267 →Non-system-created file shares on a system must limit access to groups that require it.