The Escalation Beyond Ring 0 (Kernel-Level)
For years, the battle between anti-cheat developers and cheat makers took place in Ring 0 (Windows Kernel Mode). However, as advanced cheaters began utilizing custom hypervisors (Type-2 virtualization rootkits that hook CPU control registers), security engineers realized that whoever boots first controls the operating system.
Understanding the CPU Privilege Rings: From Ring 3 to Ring -1
| Privilege Layer | Operating Environment | Access Authority |
|---|---|---|
| Ring 3 (User Mode) | Standard desktop applications & games | Restricted application memory space |
| Ring 0 (Kernel Mode) | Windows NT Kernel, graphics drivers, Vanguard/EAC | Full access to OS memory & hardware IOCTLs |
| Ring -1 (Hypervisor Mode) | Intel VT-x VMX Root / AMD-V SVM Root | Can trap and intercept every kernel instruction and page fault |
How Virtual Machine Introspection (VMI) Neutralizes Rootkits
A Type-1 hypervisor anti-cheat boots before Windows itself, placing the entire Windows OS inside a secured guest virtual container. Whenever a cheat driver attempts to manipulate page table entries (CR3 register) or disable driver signature enforcement, the CPU triggers a VM-Exit event, immediately freezing the cheating process.
Read our comparative study on FACEIT AC vs Riot Vanguard kernel architecture.
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