System Administration
Linux File Permissions, Users & Groups: A Complete Practical Guide
Learn Linux file and directory permissions, users, groups, chmod, chown, umask, ACLs, and security best practices with practical examples.
Castor
Hi, I'm a Linux Sysadmin and DevOps Engineer, fascinated by servers and nature.
Security
CVE-2026-98432: Critical Linux Kernel TCP Vulnerability Scores 9.8
Introduction A critical vulnerability in the Linux kernel's TCP networking subsystem has raised security concerns for organizations running Linux-based servers, cloud infrastructure, and containerized workloads. Tracked as CVE-2026-98432, the vulnerability has received a CVSS 3.1 score of 9.8 out of 10 from the
Security
CVE-2026-97631: Critical UEFI Firmware Flaw Exposes Servers to Pre-Boot Code Execution
Introduction A server can have a fully patched operating system, properly configured firewall rules, endpoint monitoring, and Secure Boot enabled—and still be vulnerable before any of those protections have an opportunity to work. That is the concern raised by CVE-2026-97631, a critical vulnerability discovered in the UEFI
Security
CVE-2026-111497 Explained: Node.js Brotli Decoder RCE Vulnerability (Complete Technical Analysis)
Introduction Modern web applications process enormous volumes of compressed data every second. Whether serving APIs, delivering static assets, streaming content, or responding to browser requests, compression plays a vital role in improving performance while reducing bandwidth consumption. One of the most efficient compression algorithms available today is Brotli, developed by
PHP
PHP2Shell Explained: Understanding the Critical PHP Vulnerabilities (CVE-2026-109618 & CVE-2026-109619)
Introduction When security vulnerabilities affect a widely deployed technology, the consequences often extend far beyond individual organizations. That is precisely the case with PHP2Shell, the name given to two critical Remote Code Execution (RCE) vulnerabilities tracked as CVE-2026-109618 and CVE-2026-109619. Unlike application-specific vulnerabilities that impact
Linux
CVE-2026-99999 Explained: Understanding the Critical Linux Kernel Vulnerability That Could Enable Guest-to-Host Escape
The cybersecurity landscape evolves every day, but only a handful of vulnerabilities fundamentally change how organizations think about infrastructure security. CVE-2026-99999 is one of those vulnerabilities. Disclosed in October 2026 and widely referred to by the security community as PwnEscape, this Linux kernel vulnerability highlights an important truth:
VPS
Securing a VPS Server: A Practical Linux Hardening Guide
A freshly deployed VPS is exposed to the internet within minutes. Automated bots constantly scan for Weak SSH credentials, Open ports, Vulnerable services, Misconfigured Docker containers, Outdated software, Default configurations and other weak spots. The default installation of most Linux distributions is usable, but not production-ready from a security
How to Optimize Static Websites for Best Performance?
Optimizing static websites for best performance is essential to ensure fast loading times, improved user experience, and better search engine rankings. Since static websites consist of fixed HTML, CSS, and JavaScript files that don't change unless manually updated, there are several strategies you can employ to optimize them.