Race Condition Hackviser Jun 2026

Mathematically, if each attempt wins with probability ( p = \frac\delta_\textattack\Delta t ), then after ( k ) attempts:

# Exploit code def exploit(chatbot, malicious_payload): # Create a new thread for the malicious payload malicious_thread = threading.Thread(target=chatbot.execute_task, args=(malicious_payload,)) malicious_thread.start()

Attackers may intentionally introduce subtle network delays or target high-latency paths to stretch the window between the time-of-check and time-of-use, making the vulnerability easier to hit. Prevention and Remediation Strategies race condition hackviser

# Send 50 identical requests almost simultaneously for i in range(50): engine.queue(request) # No delay - we want the race

A race condition occurs when the substance of a system's output depends on the sequence or timing of uncontrollable events. In software, it happens when multiple threads read and write to a shared resource concurrently, and the final state of the resource depends on which thread finishes first. Mathematically, if each attempt wins with probability (

: There is a fraction of a second where the file exists on the server before the deletion command executes.

def process_request(self, request): # Break down request into smaller tasks tasks = request.split() : There is a fraction of a second

chkpwd – a setuid root binary checking /etc/passwd.lock

| Target | ( \Delta t ) | Success (no hackviser) | Success (with hackviser) | Time to exploit | |--------|---------------|------------------------|--------------------------|------------------| | TOCTOU (file) | 50 µs | 2% | 96% | 2 min | | Double redeem | 15 ms | 18% | 94% | 30 sec | | Futex wake | 220 ns | 1% | 89% | 8 min |

The hackviser reduces required attempts by 3–4 orders of magnitude.