CopyFail Penguin

A safe Linux security checker for CopyFail/CVE-2026-31431.

Purpose

CopyFail Penguin checks basic Linux system information and possible exposure indicators related to the CopyFail vulnerability.

This project is intended for learning, awareness, and defensive system administration.

What it checks

• Linux distribution
• Kernel version
• Package manager
• Pending kernel updates
• Reboot-required status
• algif_aead module status

Important safety note

This project does not exploit the vulnerability.

It only checks system information, update status, reboot status, and exposure indicators.

Supported package managers

• apt
• dnf
• yum
• zypper
• pacman
• apk

Usage

python3 copyfail_checker.py