How to Add and Delete Users on Debian 8
Learning how to manage users effectively is an essential skill for any Linux system administrator. In this guide, you’ll learn to add and delete users and assign sudo privileges on a Debian 8 server.
Context Engineering: 7 Critical AI Skills to Master
Context engineering has become a critical AI skill because reliable agents need the right information, tools, memory, and evaluation at the right time.
OpenBSD 7.4 — xserver — errata 001_xserver — multiple vulnerabilities (3 CVEs) — syspatch and remediation
🟠 High ⏱ 15–60 min Last verified: 25 May 2026 Affected versions: OpenBSD 7.4 📖 ~4 min read • Source: OpenBSD 7.4 errata 001_xserver Errata topic: Security: xserver (All architectures) Issued: October 25, 2023 Related CVEs: CVE-2023-5367 CVE-2023-5380 CVE-2023-5574 Upstream summary: Fix several input validation errors in the X server. CVE-2023-5367 CVE-2023-5380 CVE-2023-5574 Table […]
Gentoo Linux — app-text/hunspell — vulnerability — patch and remediation guide
🟡 Medium ⏱ 10–30 min Last verified: 25 May 2026 Affected versions: Gentoo Linux 📖 ~4 min read • Source: Gentoo GLSA GLSA-202409-21 Upstream summary: Malicious input to the hunspell spell checker could result in an application crash or other unspecified behavior. Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis […]
Debian 9 Repository 404 Not Found for Enabled Mirror
🟡 Medium ⏱ 5–30 min Last verified: 19 May 2026 Affected versions: Debian 9 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors & […]
sshd fails due to hardened crypto policy mismatch
🔴 Critical ⏱ 5–30 min Last verified: 19 May 2026 Affected versions: RHEL 10.0 RHEL 10.1 📖 ~1 min read Table of contents Problem Summary Symptoms Diagnostics Root Cause Primary Fix Verification Prevention Rollback Automation Command Reference Escalation Related Notes Problem Summary OpenSSH daemon refuses to start after crypto policy changes. Symptoms systemctl status […]
How to Schedule Tasks with Cron on SLES 15
Introduction This tutorial covers How to Schedule Tasks with Cron on SLES 15 on SLES 15. SLES 15 (SUSE Linux Enterprise Server 16) is SUSE’s enterprise-grade Linux distribution. It uses the zypper package manager, AppArmor for mandatory access control, and systemctl for service management. Prerequisites Ensure your SLES 15 system is up to date: zypper […]
FreeBSD 12 — php70-soap — security advisory — patch and remediation guide
🟢 Low ⏱ 5–15 min Last verified: 25 May 2026 Affected versions: FreeBSD 12 📖 ~4 min read • Source: FreeBSD VuXML VuXML topic: php7 — multiple vulnerabilities Upstream summary: The PHP Group reports: Core: Fixed bug #71637 (Multiple Heap Overflow due to integer overflows in xml/filter_url/addcslashes). SOAP: Fixed bug #71610 (Type Confusion Vulnerability […]
RHEL 10 – journalctl shows repeated kernel I-O errors on XFS – Fix & Prevention
🔴 Critical ⏱ 5–30 min Last verified: 19 May 2026 Affected versions: RHEL 10 📖 ~1 min read Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance Criteria Rollback Plan Prevention & Hardening Related Errors & […]
FreeBSD 12 — django — vulnerability — patch and remediation guide
🟢 Low ⏱ 5–15 min Last verified: 25 May 2026 Affected versions: FreeBSD 12 📖 ~4 min read • Source: FreeBSD VuXML VuXML topic: django — multiple vulnerabilities Related CVEs: CVE-2012-4520 Upstream summary: The Django Project reports: Host header poisoning Several earlier Django security releases focused on the issue of poisoning the HTTP Host […]
