This report examines Hypervisor-Protected Code Integrity (HVCI)
Analyzing real-world examples highlights how the security industry and malware authors approach HVCI bypasses. 1. BlackLotus UEFI Bootkit
Because an attacker in VTL 0 cannot simply write and execute memory, they must rely on architectural loopholes, code reuse, or hardware flaws to achieve an HVCI bypass.
While ZeroHVCI was explicitly designed for educational and security research purposes, its existence proves that HVCI is not an absolute barrier—it can be defeated by chaining together properly engineered exploits. Hvci Bypass
An attacker drops an old, validly signed driver (such as an outdated anti-cheat driver, hardware monitoring utility, or graphics driver) that features arbitrary physical or virtual memory read/write primitives.
Hypervisor-Protected Code Integrity (), often referred to as Memory Integrity in Windows settings, has become the cornerstone of modern Windows security. By leveraging Virtualization-Based Security (VBS) , it creates a secure, hardware-isolated environment that assumes the main kernel may be compromised. What is HVCI?
An is any technique that allows an attacker to execute unapproved or arbitrary logic within the kernel despite these SLAT protections. Broadly, these bypasses do not actually "disable" HVCI; instead, they abuse architectural oversights, logic flaws, or pre-signed code to achieve the same end goal as arbitrary code execution. 3. Prominent Attack Surfaces and Bypass Vectors While ZeroHVCI was explicitly designed for educational and
Security updates frequently harden kernel structures, moving sensitive arrays and function pointers into read-only sections (such as MmProtectDriverSection ) to prevent data-only attacks.
Hypervisor-Protected Code Integrity (HVCI) represents a significant advancement in the Windows security architecture. By leveraging hardware virtualization to isolate the kernel-mode code integrity policy, HVCI creates a formidable barrier against kernel-level threats. However, the complex nature of this technology and its constant cat-and-mouse game with security researchers have led to a continuous stream of bypass techniques and vulnerability disclosures. This article explores the technical landscape of HVCI bypass from 2024 to 2026, examining public research, open-source tools, and real-world attack vectors.
By stitching these gadgets together by manipulating the stack, the attacker can execute complex operations entirely using pre-existing, hypervisor-approved kernel code. 4. Exploiting VTL 0 to VTL 1 Communication Channels examining public research
HVCI is a critical component of Windows security, designed to protect against sophisticated attacks. While bypass techniques have been discovered and reported, Microsoft and the security community continually work to address these vulnerabilities and improve system protections.
Researchers often chain multiple vulnerabilities to achieve kernel access. For example, the