Crihexe

Crihexe / copy-fail-tiny-elf-CVE-2026-31431

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Minimal no-libc Linux x86_64 ELF PoC build for Copy Fail (CVE-2026-31431)

copy.fail af-alg algif-aead copy-fail cve-2026-31431 elf
44
7
69% credibility
Found May 02, 2026 at 44 stars -- GitGems finds repos before they trend. Get early access to the next one.
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AI Analysis
Shell
AI Summary

A minimal, size-optimized proof-of-concept that demonstrates a Linux kernel vulnerability known as Copy Fail (CVE-2026-31431) using a tiny self-contained executable and a safe virtual machine tester.

How It Works

1
🔍 Discover the tiny exploit

You hear about a fun challenge to make the world's smallest program that tricks a Linux security flaw, shared on sites like copy.golf.

2
📥 Get the project

Download the simple files to your computer to start playing with it.

3
🛠️ Build the tiny file

Follow the easy make instruction to create your super small 492-byte exploit program.

4
🚀 Start safe test space

Run the quick test script which sets up a virtual mini-computer to try things safely without risking your real setup.

5
📂 Send it inside

The script copies your tiny program into the virtual space automatically.

6
▶️ Run the trick

Execute the program in the safe space and watch what happens.

🎉 See it work

You witness the clever exploit trigger, like popping open a super user shell, proving the tiny size record.

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AI-Generated Review

What is copy-fail-tiny-elf-CVE-2026-31431?

This repo delivers a 492-byte no-libc Linux x86_64 ELF PoC for the Copy Fail vulnerability (CVE-2026-31431), building a minimal exploit binary via simple make commands. It solves the need for a compact, testable demo of the cache poisoning issue in copy operations, complete with a one-shot QEMU VM setup on Ubuntu 24.04 for safe execution over SSH. Developers get a reproducible toolchain via Nix or direnv, plus quick size checks and cleanup.

Why is it gaining traction?

Its ultra-minimal size stands out in exploit golfing circles, competing at copy.golf against larger PoCs, while the integrated test VM skips manual setup hassles. Unlike verbose alternatives, it uses shell scripts for instant VM spins, resets, and binary copies—ideal for Linux security tinkerers chasing 2026-era CVEs like 31431. The no-libc ELF approach hooks devs into extreme optimization without bloat.

Who should use this?

Security researchers prototyping Linux kernel exploits, reverse engineers dissecting ELF payloads, or pentesters validating CVE-2026-31431 in isolated environments. It's perfect for x86_64 Linux devs building minimal no-libc binaries or competing in copy fail challenges, not general app development.

Verdict

Grab it if you're deep into Linux ELF exploits—solid docs and VM tests make it dead simple despite 44 stars and a 0.699999988079071% credibility score reflecting its niche maturity. Skip for production; it's a sharp PoC, not a library.

(178 words)

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