Memory Integrity in Windows 11: Enabled by Default, But Not Always
Memory Integrity—also known as Core Isolation—is one of the key security features built into Windows 11. It helps protect the operating system from malicious attacks by isolating critical processes in memory. Starting with newer versions of Windows 11, Microsoft is making this feature enabled by default—but depending on your hardware, BIOS settings, and drivers, that may not always be the case.
What Is Memory Integrity?
Memory Integrity (part of Core Isolation) uses virtualization-based security (VBS) to prevent attackers from injecting malicious code into high-security processes. When it’s on, it adds a strong layer of protection against sophisticated malware and exploits targeting the kernel.
Microsoft’s Default Behavior
- In Windows 11 version 24H2, memory integrity is enabled by default if virtualization (SVM mode) is turned on in BIOS.
- In Windows 11 version 25H2, the same behavior continues: on many systems with proper firmware support, it will be on by default after installation.
This means users don’t always need to manually enable it—Windows takes care of it, provided the system meets requirements.
Why Memory Integrity Might Be Disabled
Even though it’s “default,” some systems still show memory integrity as disabled in Windows Security. The main reasons are:
- BIOS Settings – If SVM mode (virtualization) is turned off in BIOS, memory integrity can’t run.
- Driver Incompatibility – Windows may automatically disable it if certain drivers aren’t compatible. Outdated or unsigned drivers are the most common culprits.
- Manual Changes – Users (or admins) may turn it off for performance reasons, though this reduces security.
How to Enable It
- Open Windows Security from the Start menu.
- Go to Device Security > Core Isolation details.
- Toggle Memory Integrity to On.
- Restart your PC to apply the change.
If the option is greyed out or missing:
- Check BIOS and ensure virtualization is enabled.
- Update or replace incompatible drivers.
Enterprise Considerations
For IT admins using Microsoft Intune or Group Policy, relying on “default” settings may not be enough. To guarantee protection:
- Use Endpoint Security policies to enforce Core Isolation and Memory Integrity.
- Regularly audit compliance reports for devices with incompatible drivers.
- Communicate with users about possible driver updates or hardware upgrades.
Final Thoughts
Memory Integrity in Windows 11 is one of those features that quietly raises the security baseline. While Microsoft is moving toward enabling it automatically, the reality is that BIOS configurations and legacy drivers still get in the way. If you’re managing devices in an enterprise, don’t assume it’s always on—verify, enforce, and monitor.
