🚀 CVE-2026-46333 - ssh-keysign-pwn

High-quality Proof of Concept for the Linux kernel race condition vulnerability

A clean and reliable proof-of-concept exploit for CVE-2026-46333 — Local information disclosure via race condition in the Linux kernel's process exit path.

🖼️ Screenshot

Successfully stealing SSH host private key and /etc/shadow on Kali Linux

📌 About the Vulnerability

CVE-2026-46333 (also known as ssh-keysign-pwn) is a race condition in the Linux kernel's ptrace and process exit logic (do_exit() → exit_mm() before exit_files()).

When a privileged process (e.g. SUID ssh-keysign or chage) has mm == NULL during exit, the dumpability check is bypassed, allowing an unprivileged local attacker to use pidfd_getfd() to steal open file descriptors.

Impact:

• Steal SSH host private keys (/etc/ssh/ssh_host_*_key)
• Dump /etc/shadow
• Potential for further attacks using stolen credentials

Discovered by: Qualys
Fixed in: Kernel commit 31e62c2ebbfdc3fe3dbdf5e02c92a9dc67087a3a (May 2026)

✨ Features

• Original clean code (not copied from existing repos)
• High success rate
• Two working exploits:
  • SSH Host Private Key Stealer
  • /etc/shadow Stealer via chage
• Clean output with progress feedback
• No external dependencies
• Well commented

🛠️ Usage

1. Clone & Build

git clone https://github.com/0xBlackash/CVE-2026-46333.git
cd CVE-2026-46333

2. Run SSH Host Key Exploit

sudo ./CVE-2026-46333

3. Run Shadow File Exploit

sudo ./CVE-2026-46333-shadow

📂 Files

📖 Example Output

SSH Key Stealer:

[+] SUCCESS! Stolen fd 3 -> /etc/ssh/ssh_host_ecdsa_key (round 0)
-----BEGIN OPENSSH PRIVATE KEY-----
b3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAAB...

Shadow Stealer:

[+] SUCCESS! Stolen /etc/shadow (round 0)
root:*:19953:0:99999:7:::
kali:$y$j9T$zY1oKFxJlTgP2WcJhzbNl1$...

🛡️ Mitigation

• Update your kernel to any version containing commit 31e62c2ebbfd...
• Recommended: Use latest stable kernel from your distribution
• Disable EnableSSHKeysign in sshd_config if not needed

⚠️ Legal Disclaimer

This exploit is for educational and security research purposes only.
Use it only on systems you own or have explicit written permission to test.
The author is not responsible for any misuse or damage.

⭐ Credits

• Vulnerability: Qualys
• PoC Development: Ashraf Zaryouh ""0xBlackash""
• Original Research: Various kernel researchers

📜 License

This project is licensed under the MIT License — feel free to use, modify, and distribute.

Made with ❤️ for the security community

Keeping systems updated is the best defense.