Hvci Bypass ((top)) Jun 2026

DOG operates by leveraging existing kernel read/write primitives obtained through driver exploits. Instead of loading an unsigned driver (which triggers PatchGuard), DOG chains data-oriented gadgets from signed kernel code. This technique allows arbitrary kernel-level operations without executing new code, making it invisible to code integrity checks.

To counter BYOVD, Microsoft enforces the Windows Vulnerable Driver Blocklist. Managed via Windows Update, this blocklist is checked directly by HVCI. Even if a driver is legitimately signed, if it is known to have vulnerabilities that allow arbitrary read/write, HVCI will refuse to let it map into kernel memory. Kernel Control Flow Guard (kCFG) and Intel CET

When a driver attempts to allocate memory or modify code, the request is intercepted by the hypervisor. The hypervisor consults VTL 1 ( CI.dll ) to verify the digital signature of the page before granting execution permissions (changing the page from Writable to Executable). 2. Evolution of HVCI Bypass Methodologies Hvci Bypass

As Microsoft continues to patch CVEs like CVE-2025-48813 (Key Expiration in VSM) and refines the secure kernel, the research community will continue to probe the edge of the hypervisor. In this game, the only certainty is that the "bypass" narrative will persist alongside the evolution of the Windows security stack.

Where the standard user-mode applications and the Windows kernel ( ntoskrnl.exe ) reside. To counter BYOVD, Microsoft enforces the Windows Vulnerable

Understanding HVCI Bypasses: The Battle for Kernel Integrity

The most direct—and rarest—bypass involves attacking the hypervisor itself. If a vulnerability exists in how the hypervisor manages Extended Page Tables (EPT) or Second Level Address Translation (SLAT), an attacker could theoretically remap memory pages to bypass the "Secure Kernel" checks entirely. 4. Mapper Techniques (KDU and Others) Kernel Control Flow Guard (kCFG) and Intel CET

: A newly revealed open-source project exploits a legitimate but vulnerable driver, wsftprm.sys, which is not on Microsoft's blocklist, to terminate critical antivirus (AV) and endpoint detection and response (EDR) processes. This BYOVD attack works even on fully patched Windows 11 systems with HVCI and Secure Boot enabled, bypassing some of Microsoft's strongest kernel protections.