Linux

Common Problems 119554

Debian 13 – DNS resolution fails with systemd-resolved misconfiguration

🟠 High   ⏱ 5–30 min  Last verified: 11 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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How to Enable WebSocket Proxying in Nginx on RHEL 10 — step-by-step RHEL 10 tutorial on Progressive Robot

How to Enable WebSocket Proxying in Nginx on RHEL 10

Introduction RHEL 10 ships with a stable, security-hardened base that makes deploying enable websocket proxying in nginx both straightforward and auditable. This tutorial covers the complete procedure for how to Enable WebSocket Proxying in Nginx on RHEL 10, including dnf module streams where applicable, systemd unit management, and the firewalld rules required for network-facing services. […]

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openSUSE Leap 15.6 — libvirt — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on openSUSE Leap 15.6

openSUSE Leap 15.6 — libvirt — multiple vulnerabilities (3 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: openSUSE Leap 15.6 📖 ~4 min read  •  Source: SUSE advisory SUSE-SU-2025:21082-1 (see also SUSE bugzilla) Related CVEs: CVE-2025-12748 CVE-2025-13193 CVE-2024-4418 Upstream summary: A flaw was discovered in libvirt in the XML file processing. More specifically, the parsing of user provided XML […]

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Oracle Linux 9 — jmc — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 9

Oracle Linux 9 — jmc — vulnerability — patch and remediation guide (ELSA-2026-0752)

🟠 High   ⏱ 15–60 min  Last verified: 11 October 2025 Affected versions: Oracle Linux 9 📖 ~4 min read  •  Source: ELSA advisory ELSA-2026-0752 Related CVEs: CVE-2025-66566 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance […]

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Oracle Linux 9 — firefox — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 9

Oracle Linux 9 — firefox — vulnerability — patch and remediation guide (ELSA-2025-4443)

🟠 High   ⏱ 15–60 min  Last verified: 11 October 2025 Affected versions: Oracle Linux 9 📖 ~4 min read  •  Source: ELSA advisory ELSA-2025-4443 Related CVEs: CVE-2025-4091 CVE-2025-2817 CVE-2025-4083 CVE-2025-4093 CVE-2025-4087 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative […]

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How to Scan Container Images with Trivy on Debian 13 — step-by-step Debian 13 tutorial on Progressive Robot

How to Scan Container Images with Trivy on Debian 13

Introduction How to Scan Container Images with Trivy on Debian 13 is a fundamental operation for any administrator maintaining a Debian 13 Trixie server. Debian 13 Trixie ships with the Linux 6.12 kernel, updated toolchains, and a fully refreshed package archive — meaning version numbers, configuration file paths, and some dependency chains differ from Debian […]

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How to Configure System-Wide Crypto Policies on RHEL 10 — step-by-step RHEL 10 tutorial on Progressive Robot

How to Configure System-Wide Crypto Policies on RHEL 10

Introduction RHEL 10 ships with a stable, security-hardened base that makes deploying configure system-wide crypto policies both straightforward and auditable. This tutorial covers the complete procedure for how to Configure System-Wide Crypto Policies on RHEL 10, including dnf module streams where applicable, systemd unit management, and the firewalld rules required for network-facing services. Prerequisites The […]

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Common Problems 124085

Oracle Linux 10 – systemd-resolved DNS failures on internal zones – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 10 October 2025 Affected versions: Oracle Linux 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 […]

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Common Problems 127112

CentOS Stream 10 – Common Problem 140 – Diagnosis and Fix

🟠 High   ⏱ 5–30 min  Last verified: 10 October 2025 Affected versions: CentOS Stream 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 […]

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Amazon Linux 2023 — glib2 — multiple vulnerabilities (9 CVEs) — patch and remediation guide — diagnosis and fix on Amazon Linux 2023

Amazon Linux 2023 — glib2 — multiple vulnerabilities (9 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Amazon Linux 2023 📖 ~4 min read  •  Source: Amazon Linux advisory ALAS2023-2025-1349 Related CVEs: CVE-2025-14087 CVE-2025-13601 CVE-2025-3360 CVE-2025-6052 CVE-2023-24593 CVE-2023-25180 CVE-2023-29499 CVE-2023-32611  +1 more Upstream summary: Buffer underflow on Glib through glib/gvariant via bytestring_parse() or string_parse() leads to OOB Write. (CVE-2025-14087) […]

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