Microsoft Advancing Windows Driver Security: Ending Cross-Signed Kernel Driver Trust
Microsoft is preparing a major change to Windows that could quietly reshape how security and compatibility are balanced across the entire ecosystem. Starting April 2026, Windows will begin blocking kernel drivers signed through the legacy cross-signed root program by default, replacing a decades-old trust model with a stricter, policy-driven approach centred on the Windows Hardware Compatibility Program (WHCP). This is more than a routine update.