Windows BSOD CRITICAL_STRUCTURE_CORRUPTION (0x00000109) — Kernel Integrity Failure

CRITICAL_STRUCTURE_CORRUPTION BSOD occurs when the kernel detects tampering with critical data structures, caused by faulty drivers, hardware, or rootkits. This guide covers everything you need to know about this topic, including common causes, step-by-step solutions, and answers to frequently asked questions.

Here are the key things to understand: Stop code 0x00000109 — kernel data structure integrity check failed. Windows Kernel Patch Protection (PatchGuard) detected unexpected modification. Can indicate rootkit or malware tampering with kernel memory. Also caused by faulty RAM modifying kernel memory randomly. Drivers that hook kernel functions inappropriately trigger this. Understanding these fundamentals will help you diagnose and resolve this issue more effectively.

The most common reasons this occurs include: Faulty RAM randomly corrupting kernel data structures. Malicious software (rootkit) modifying kernel code or tables. Poorly written drivers patching kernel functions illegally. Incompatible virtualization or anti-cheat software hooking the kernel. Hardware failure in CPU or motherboard affecting memory integrity. Identifying the root cause is the first step toward finding the right solution.

To resolve this, follow these recommended steps: Run full antivirus and anti-rootkit scan (Malwarebytes, ESET Online Scanner). Run Windows Memory Diagnostic and MemTest86 for comprehensive RAM testing. Uninstall recently installed drivers or software that hook the kernel (anti-cheat, VPN). Run sfc /scannow and DISM /Online /Cleanup-Image /RestoreHealth. If RAM tests pass, test with minimal drivers by booting into Safe Mode. If these steps do not resolve the issue, consider consulting additional resources or a qualified professional.

This article is part of our Windows Error Codes collection on Error Codes Wiki. We provide comprehensive, up-to-date information to help you find solutions quickly.