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4. Exploiting Hypervisor Flaws and Page Table Desynchronization

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HVCI Bypass: Understanding and Bypassing Hypervisor-Protected Code Integrity (2026 Update) Under HVCI: Memory pages can be writable

HVCI strictly enforces the paradigm across all kernel memory. Under HVCI: Memory pages can be writable. Memory pages can be executable. No page can be both writable and executable simultaneously. This article summarizes how HVCI works at a

This article summarizes how HVCI works at a high level, the categories of bypass approaches researchers have explored, key real‑world research findings, practical implications, and defensive guidance.

CVE-2025-59033, a vulnerability in Microsoft's driver blocklist implementation, can be exploited on systems without HVCI enabled. Microsoft explicitly recommends enabling HVCI on all Windows systems as a primary mitigation. On systems without HVCI support, granular App Control should be implemented.

HVCI stops this by separating the operating system into Virtual Trust Levels (VTLs) using a hypervisor (Hyper-V):