Title: ubuntu - Immanuel Raj --- # Tag: ubuntu * [⌊How I Audited 41 Ubuntu Servers for CVE-2026-31431 “Copy Fail” — and What I Found⌉⌊How I Audited 41 Ubuntu Servers for CVE-2026-31431 “Copy Fail” — and What I Found⌉[ * ## 󠀁[How I Audited 41 Ubuntu Servers for CVE-2026-31431 “Copy Fail” — and What I Found](https://immanuelraj.dev/copy-fail-cve-2026-31431-ubuntu-audit/)󠁿 * [May 5, 2026](https://immanuelraj.dev/copy-fail-cve-2026-31431-ubuntu-audit/) * — * by * [Immanuel Raj](https://immanuelraj.dev/author/iamimmanuelraj/) * in [Linux](https://immanuelraj.dev/category/linux/), [Security](https://immanuelraj.dev/category/security/), [Self Hosting](https://immanuelraj.dev/category/self-hosting/) * Read Time * 5–8 minutes * CVE-2026-31431 “Copy Fail” is a HIGH severity Linux kernel vulnerability that lets any local user gain root. I audited all 41 of my Ubuntu servers, found one actively exposed, applied the mitigation, and checked for compromise. Here’s the full technical breakdown. * [⌊A tech-themed image with a dark background. A glowing orange Ubuntu logo on the left is connected to a glowing blue globe (representing the internet) on the right by a line with the word 'Netplan' in the center.⌉⌊A tech-themed image with a dark background. A glowing orange Ubuntu logo on the left is connected to a glowing blue globe (representing the internet) on the right by a line with the word 'Netplan' in the center.⌉[ * ## 󠀁[How to Add Floating IP to Ubuntu and Debian Servers with Netplan](https://immanuelraj.dev/netplan-floating-ip-configuration/)󠁿 * [August 14, 2025](https://immanuelraj.dev/netplan-floating-ip-configuration/) * — * by * [Immanuel Raj](https://immanuelraj.dev/author/iamimmanuelraj/) * in [Linux](https://immanuelraj.dev/category/linux/), [Networking](https://immanuelraj.dev/category/networking/), [Self Hosting](https://immanuelraj.dev/category/self-hosting/) * Read Time * 8–11 minutes * Learn how to configure floating IP addresses on Ubuntu and Debian servers using Netplan for high availability and seamless failover. This comprehensive guide covers YAML configuration, troubleshooting, security best practices, and automation scripts for production environments. * ## 󠀁[Rootless docker](https://immanuelraj.dev/rootless-docker/)󠁿 * [February 22, 2024](https://immanuelraj.dev/rootless-docker/) * — * by * [Immanuel Raj](https://immanuelraj.dev/author/iamimmanuelraj/) * in [Uncategorized](https://immanuelraj.dev/category/uncategorized/) * Read Time * 1–2 minutes * References ASSUMPTIONS Docker Root Installation Pre-Requisites Docker Installation Installing docker compose It all works 🎉 ! But here are some common problems Network slow For this you can refer to https://docs.docker.com/engine/security/ rootless/#network-is-slow Using privileged ports aka <1024 * ## 󠀁[WordPress and Nginx (OpenResty)](https://immanuelraj.dev/wordpress-and-nginx-openresty/)󠁿 * [January 23, 2024](https://immanuelraj.dev/wordpress-and-nginx-openresty/) * — * by * [Immanuel Raj](https://immanuelraj.dev/author/iamimmanuelraj/) * in [Linux](https://immanuelraj.dev/category/linux/), [Networking](https://immanuelraj.dev/category/networking/), [WordPress](https://immanuelraj.dev/category/wordpress/) * Read Time * 2–3 minutes * WordPress WordPress is a web content management system. It was originally created as a tool to publish blogs but has evolved to support publishing other web content, including more traditional websites, mailing lists and Internet forum, media galleries, membership sites, learning management systems and online stores. Ngins( Open Resty) OpenResty® is a full-fledged web platform that… * ## 󠀁[Linux Saviours](https://immanuelraj.dev/linux-saviours/)󠁿 * [January 19, 2024](https://immanuelraj.dev/linux-saviours/) * — * by * [Immanuel Raj](https://immanuelraj.dev/author/iamimmanuelraj/) * in [Linux](https://immanuelraj.dev/category/linux/) * Read Time * 9–14 minutes * Few Basic linux (Ubuntu) stuff that will save you time and get the job done with ease. Linux and it’s programs are by default built to allows users to accomplish tasks easily. But many people dont even know that there are many other useful commands and tools.Many people know the basics or only what they… * [⌊OpenResty SSL Setup: Install and Secure Site withNginx with Let’s Encrypt on Ubuntu⌉⌊OpenResty SSL Setup: Install and Secure Site withNginx with Let’s Encrypt on Ubuntu⌉[ * ## 󠀁[OpenResty SSL Setup: Install and Secure Site withNginx with Let’s Encrypt on Ubuntu](https://immanuelraj.dev/nginx-openresty-ssl-setup-ubuntu/)󠁿 * [January 17, 2024](https://immanuelraj.dev/nginx-openresty-ssl-setup-ubuntu/) * — * by * [Immanuel Raj](https://immanuelraj.dev/author/iamimmanuelraj/) * in [Linux](https://immanuelraj.dev/category/linux/), [Self Hosting](https://immanuelraj.dev/category/self-hosting/), [SSL](https://immanuelraj.dev/category/ssl/), [Web](https://immanuelraj.dev/category/web/) * Read Time * 2–3 minutes * Learn how to install and configure OpenResty Nginx SSL on Ubuntu. This guide covers setting up OpenResty, obtaining an SSL certificate using Certbot, and enabling auto-renewal for a secure HTTPS website. 🚀 * [⌊Step-by-Step Guide to Configuring Nginx and PHP-FPM on Ubuntu⌉⌊Step-by-Step Guide to Configuring Nginx and PHP-FPM on Ubuntu⌉[ * ## 󠀁[Step-by-Step Guide to Configuring Nginx and PHP-FPM on Ubuntu](https://immanuelraj.dev/nginx-and-php-fpm-setup/)󠁿 * [January 17, 2024](https://immanuelraj.dev/nginx-and-php-fpm-setup/) * — * by * [Immanuel Raj](https://immanuelraj.dev/author/iamimmanuelraj/) * in [Uncategorized](https://immanuelraj.dev/category/uncategorized/) * Read Time * 1–2 minutes * Unlock the full potential of your Linux (Ubuntu) server by mastering the setup of Nginx and PHP-FPM with our step-by-step guide. This comprehensive tutorial will walk you through the installation and configuration processes, ensuring your server runs efficiently and effectively. Learn best practices, optimize performance, and enhance your server’s capabilities with our detailed instructions and… * [⌊Oh-My-ZSH⌉⌊Oh-My-ZSH⌉[ * ## 󠀁[Oh-My-ZSH](https://immanuelraj.dev/oh-my-zsh/)󠁿 * [January 11, 2024](https://immanuelraj.dev/oh-my-zsh/) * — * by * [Immanuel Raj](https://immanuelraj.dev/author/iamimmanuelraj/) * in [Linux](https://immanuelraj.dev/category/linux/), [Terminal](https://immanuelraj.dev/category/terminal/), [Tools](https://immanuelraj.dev/category/tools/) * Read Time * 1–2 minutes * Master Ubuntu servers with our comprehensive guide to HTTP servers, Nginx, and PHP. Dive into the essentials of setting up and managing Ubuntu servers efficiently, configuring HTTP servers, and optimizing web performance with Nginx and PHP