Linux

Common Problems 119632

Debian 13 – fail2ban Not Banning on nftables Backend – Action Configuration Fix

🟡 Medium   ⏱ 5–30 min  Last verified: 26 October 2025 Affected versions: Debian 13 (Trixie) 📖 ~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 […]

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Debian 11 — node-elliptic — multiple vulnerabilities (8 CVEs) — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — node-elliptic — multiple vulnerabilities (8 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 26 October 2025 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2020-13822 CVE-2020-28498 CVE-2024-42459 CVE-2024-42460 CVE-2024-42461 CVE-2024-48948 CVE-2024-48949 CVE-2025-14505 Upstream summary: The Elliptic package 6.5.2 for Node.js allows ECDSA signature malleability via variations in encoding, leading '\0' bytes, or […]

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Common Problems 114545

RHEL 9: dnf Transaction Fails Due to Package Conflicts

🟡 Medium   ⏱ 5–30 min  Last verified: 26 October 2025 📖 ~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 & Cross-Refs References & Further […]

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AlmaLinux 9 — poppler — multiple vulnerabilities (4 CVEs) — patch and remediation guide — diagnosis and fix on AlmaLinux 9

AlmaLinux 9 — poppler — multiple vulnerabilities (4 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: AlmaLinux 9 📖 ~4 min read  •  Source: AlmaLinux ALSA ALSA-2026:0126 Related CVEs: CVE-2025-32365 CVE-2024-6239 CVE-2022-38784 CVE-2022-27337 Upstream summary: Poppler is a Portable Document Format (PDF) rendering library, used by applications such as Evince. Security Fix(es): * poppler: Out-of-Bounds Read in Poppler […]

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Common Problems 119534

Debian 13 – sudo fails in automation with no tty present

🟡 Medium   ⏱ 5–30 min  Last verified: 26 October 2025 Affected versions: Debian 13 Debian 13 (Trixie) Debian 13.x 📖 ~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 […]

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Common Problems 116997

Ubuntu 22.04 NGINX Fails to Start Due to Port 80 Conflict

🟡 Medium   ⏱ 5–30 min  Last verified: 26 October 2025 📖 ~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 & Cross-Refs References & Further […]

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Debian 13 — python-asteval — vulnerability — patch and remediation guide — diagnosis and fix on Debian 13

Debian 13 — python-asteval — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 26 October 2025 Affected versions: Debian 13 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2025-24359 Upstream summary: ASTEVAL is an evaluator of Python expressions and statements. Prior to version 1.0.6, if an attacker can control the input to the `asteval` library, they can […]

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Debian 13 — tre — vulnerability — patch and remediation guide — diagnosis and fix on Debian 13

Debian 13 — tre — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 26 October 2025 Affected versions: Debian 13 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2016-8859 Upstream summary: Multiple integer overflows in the TRE library and musl libc allow attackers to cause memory corruption via a large number of (1) states or (2) tags, […]

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Common Problems 116609

Ubuntu 24.04 LTS OpenSSH Host Key Changed Alert After Rebuild

🟡 Medium   ⏱ 5–30 min  Last verified: 26 October 2025 📖 ~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 & Cross-Refs References & Further […]

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How to Install Helm on RHEL 10 — step-by-step RHEL 10 tutorial on Progressive Robot

How to Install Helm on RHEL 10

Introduction Setting up install helm on a RHEL 10 server is a common task for system administrators, DevOps engineers, and site reliability engineers. This guide explains how to Install Helm on RHEL 10, with all the commands you need, the SELinux and firewalld considerations to keep in mind, and how to validate the result on […]

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