Windows 11 Starts Expanding Memory Integrity Protection in October

Microsoft says Windows quality updates beginning in October 2026 will start enabling Memory Integrity on more eligible Windows devices. On some systems, the change will also enable the underlying Virtualization-based Security (VBS) platform.

The rollout is gradual rather than a single universal switch. Microsoft says Windows evaluates device readiness before enablement using hardware capabilities, compatibility, performance considerations, Windows 11 requirements and recommended built-in protections.

Memory Integrity is also known as Hypervisor-protected Code Integrity, or HVCI. It uses VBS and the Windows hypervisor to place kernel-mode code-integrity enforcement inside an isolated environment, making it harder for malware that compromises the normal Windows kernel to tamper with those checks.

Microsoft's documentation says the feature also restricts kernel memory allocations and only allows trusted kernel-mode code and drivers to run. That is why expanding it to existing eligible PCs is a meaningful security change rather than simply another Windows Security notification.

The main compatibility boundary is kernel-mode software. Microsoft warns that some applications and hardware drivers remain incompatible with Memory Integrity and can malfunction after it is enabled; rare cases can result in a boot failure or blue screen.

Microsoft specifically lists gaming anti-cheat software, third-party input methods and third-party banking password protection among areas where incompatibilities have been observed. For a boot-critical incompatible driver, Windows can silently turn off Memory Integrity when it had been auto-enabled rather than leave the machine unable to boot.

Microsoft says Memory Integrity works better with Intel Kaby Lake and newer processors using Mode-Based Execution Control and with AMD Zen 2 and newer processors using Guest Mode Execute Trap. Older processors can fall back to Restricted User Mode emulation, which Microsoft says has a larger performance impact.

That does not establish a fixed gaming-performance penalty for every PC. The actual effect depends on the processor, workload, virtualization path and software stack, and Microsoft's October rollout includes performance considerations in its readiness assessment.

Users can check the current state under Windows Security > Device security > Core isolation details > Memory integrity. If a previously working peripheral or low-level application stops behaving normally after the setting becomes enabled, Microsoft's supported first step is to look for a compatible driver or application update rather than immediately disabling the protection.

The useful boundary for October is therefore narrow: Microsoft is broadening default protection across eligible existing devices, but it is doing so gradually, checking readiness first and respecting deliberate prior configuration. Microsoft has not said that every eligible Windows 11 PC will switch on at the same time.