Windows 11, introduced by Microsoft, comes packed with advanced security features designed to protect the operating system and the data stored within it. Among these features are Hypervisor-Protected Code Integrity (HVCI) and Kernel Mode Code Integrity (KMCI). While these technologies provide enhanced security by isolating certain processes and enforcing strict rules on code that can run in kernel mode, there may be scenarios where a user needs to disable them. This article will explore both HVCI and KMCI, provide detailed instructions on how to disable them, and discuss the implications and potential alternatives.
Understanding HVCI and KMCI
What is HVCI?
Hypervisor-Protected Code Integrity (HVCI) uses virtualization-based security to prevent code injection and restrict the execution of untrusted code at the kernel level. By running memory in a secure environment, HVCI ensures that only trusted code is executed in kernel mode, enhancing the overall integrity of the Windows operating system. This feature becomes crucial in defending against sophisticated malware that tries to exploit the kernel.
What is KMCI?
Kernel Mode Code Integrity (KMCI) is a component that ensures that only kernel-mode code that is properly signed and trusted by Microsoft is loaded into the system memory. This prevents unsigned drivers and code from executing, significantly minimizing the attack surface that malicious actors can exploit.
When to Disable HVCI and KMCI?
Although HVCI and KMCI substantially improve security, there are certain cases where users may want or need to disable them, such as:
Compatibility Issues
: Some older software or drivers that have not been updated may not be compatible with these features, resulting in crashes or system instability.
Performance Concerns
: In certain environments, especially those relying on virtualization or gaming, users may experience performance bottlenecks due to the overhead introduced by HVCI.
Development and Testing Needs
: Developers working on drivers, software, or systems that interact closely with kernel-level processes may require the ability to load unsigned code for testing purposes.
It’s essential to be aware that disabling these security features can expose your system to vulnerabilities, so weigh the benefits against the risks before proceeding.
How to Disable HVCI and KMCI in Windows 11
Disabling HVCI and KMCI in Windows 11 can be accomplished in several ways. Below are the detailed steps for disabling them through Windows Security, Group Policy Editor, and Registry Editor. Please ensure that you have administrative privileges before beginning the process.
Method 1: Disabling HVCI and KMCI via Windows Security
Open Windows Security
:
-
Click on the
Start
menu and select
Settings
. -
Navigate to
Privacy & Security
. -
Click on
Windows Security
.
Access Device Security
:
-
In the Windows Security app, click on
Device Security
on the left menu. -
Click on
Core Isolation details
.
Disable Memory Integrity
:
-
Toggle the switch for
Memory Integrity
to the Off position. - A prompt may appear warning you of the potential risks. Confirm your decision.
Restart Your Computer
:
- You will need to restart your computer for the changes to take effect.
This method effectively disables HVCI. KMCI will also be disabled as it operates in conjunction with HVCI through the integrity checks enforced by Memory Integrity.
Method 2: Disabling HVCI and KMCI via Group Policy Editor
If you’re using Windows 11 Pro, Enterprise, or Education editions, the Group Policy Editor provides an alternative way to manage these settings.
Open Group Policy Editor
:
-
Press
Win + R
to open the Run dialog. -
Type
gpedit.msc
and press Enter.
Navigate to the Appropriate Policy
:
-
In the Group Policy Editor, navigate to:
Computer Configuration -> Administrative Templates -> System -> Device Guard
Configuration Options
:
-
Find the setting titled
“Turn On Virtualization Based Security”
and double-click it. -
Set it to
Disabled
.
Disable Code Integrity
:
-
Navigate to:
Computer Configuration -> Administrative Templates -> System -> Device Guard -> Code integrity -
Double-click the setting titled
“Deploy Code Integrity policies”
and set it to
Disabled
.
Apply Changes and Restart
:
-
Click
OK
to apply your changes and exit the Group Policy Editor. - Restart your computer for the changes to take effect.
Method 3: Disabling HVCI and KMCI via Registry Editor
For users who are comfortable editing the Windows Registry, this method can also disable HVCI and KMCI. However, proceed with caution, as incorrect changes to the Registry can lead to system instability.
Open Registry Editor
:
-
Press
Win + R
to open the Run dialog. -
Type
regedit
and press Enter.
Navigate to the Required Keys
:
-
Go to the following path:
HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlDeviceGuard -
Find the value named
“EnableVirtualizationBasedSecurity”
and set it to
0
.
Disable Code Integrity
:
-
Now, navigate to:
HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlDeviceGuardScenariosCredentialGuard -
Look for and set the value
“Enabled”
to
0
.
Close the Registry Editor and Restart
:
- Exit the Registry Editor.
- Restart your computer to apply the changes.
Important Considerations
Security Risks
Disabling HVCI and KMCI compromises the security posture of your operating system. With these features turned off, the system becomes more vulnerable to attacks that exploit kernel vulnerabilities. Consider implementing alternative security measures, like reliable antivirus software and ensuring your system is regularly updated, to mitigate some risks.
Performance Impact After Disabling
Users may notice improved performance after disabling these features, especially in scenarios involving graphics-heavy applications or legacy software. However, the observed benefits will depend on your hardware configuration and the software in use.
Re-enabling HVCI and KMCI
Should you choose to re-enable HVCI and KMCI, you can follow the same steps as above, toggling the features back on in Windows Security, Group Policy Editor, or the Registry Editor. Remember that re-enabling these features will require a system restart.
Additional Alternatives
If you experience issues after disabling HVCI or KMCI, or you still need compatibility for certain applications, consider the following alternatives:
Driver Updates
: Many software and drivers that are incompatible with HVCI and KMCI often receive updates. Regularly check for updates from hardware manufacturers.
Virtualization Solutions
: If your primary concern is running incompatible applications, consider using virtualization software such as Hyper-V or VMware, allowing you to run older operating systems inside a virtual machine while keeping your main OS secure.
Security Configuration Options
: Explore other security configurations that don’t involve disabling HVCI and KMCI. For example, adjusting your antivirus settings or using software designed to run alongside these features.
Conclusion
Disabling HVCI and KMCI in Windows 11 can be a necessary step for users needing to run legacy applications, troubleshoot compatibility issues, or seek performance gains. However, such actions should be taken with a clear understanding of the associated risks. Cyber threats are constantly evolving, and the protective measures offered by HVCI and KMCI, among others, play crucial roles in safeguarding your system.
Before proceeding to disable these features, consider the implications carefully, keep your software updated, and explore alternative options that maintain security without sacrificing compatibility. Remember, in the world of cybersecurity, informed decisions lead to safer computing experiences.