Virtualization-Based Security (VBS) is a Windows architecture that uses the hypervisor to create an isolated trust area for sensitive security functions. Instead of keeping everything in the normal operating system kernel, VBS moves selected protections into a more hardened environment that is harder for malware or an attacker-controlled process to tamper with.
VBS matters because many modern defenses depend on it. Features such as Hypervisor-Protected Code Integrity and other protected security services rely on this isolation to help block kernel modification, credential theft, and tampering with security tools. In real attacks, adversaries often try to weaken VBS, bypass its checks, or abuse bugs in related components so they can operate with less detection and more control. For defenders, strong VBS configuration, patching, and verification that memory integrity remains enabled are important parts of hardening Windows endpoints.