CRITICAL_STRUCTURE_CORRUPTION (0x109)
What is this error?
The kernel detected critical system data structure corruption. Often caused by a driver or hardware corrupting kernel memory.
Common causes
- rootkit or malware
- buggy kernel driver
- failing hardware
- RAM corruption
- kernel patch protection violation
How to fix it
- Scan for rootkits
- update all drivers
- test RAM
- check for hardware issues
Too many steps? Crashless can diagnose this automatically — checks your drivers, temps, VRAM, and 400+ known error patterns.
Get free AI diagnosis Detailed analysis
Bug check 0x00000109 (CRITICAL_STRUCTURE_CORRUPTION) means the kernel detected that critical data structures (GDT, IDT, processor state) have been corrupted. This is a serious integrity violation. The most concerning cause is a rootkit modifying kernel structures — Windows Kernel Patch Protection (PatchGuard) detects this. Other causes: a buggy driver writing to wrong memory addresses, RAM hardware errors, or a failing CPU. Fixes:
- Run Windows Defender offline scan (full rootkit scan),
- Run Malwarebytes and consider specialized rootkit scanners (GMER, TDSSKiller),
- If malware scans are clean: run memtest86 for RAM,
- Check the minidump for any suspicious drivers,
- Boot into Safe Mode — if stable, a third-party driver is the cause,
- If persistent with clean scans: consider clean Windows install to eliminate any hidden rootkit.
When to seek help
If this error keeps happening after trying the fixes above, it may point to a deeper hardware or system issue. Consider professional help if:
- The crash occurs across multiple games or applications
- You see the same error after a clean Windows install
- Your PC is less than a year old (could be a warranty issue)
- You smell burning or hear unusual sounds from your PC
Or let Crashless do the deep analysis for you -- our AI checks drivers, temps, event logs, and 400+ known patterns automatically.
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