Linux

Common Problems 119496

Debian 13 SSH Access Denied Due to Permission Hardening Mistakes

🟡 Medium   ⏱ 5–30 min  Last verified: 11 November 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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Alpine Linux 3.20 — freetype — multiple vulnerabilities (7 CVEs) — patch and remediation guide — diagnosis and fix on Alpine Linux 3.20

Alpine Linux 3.20 — freetype — multiple vulnerabilities (7 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Alpine Linux 3.20 / fixed in 2.9-r1 📖 ~4 min read  •  Source: Alpine secdb entry — freetype 2.9-r1 Related CVEs: CVE-2018-6942 CVE-2017-8105 CVE-2017-8287 CVE-2022-27404 CVE-2022-27405 CVE-2022-27406 CVE-2020-15999 Upstream summary: Alpine main repository for vv3.20 ships freetype 2.9-r1 which addresses CVE-2018-6942. Table […]

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SLES 16 — python313-rsa — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on SLES 16

SLES 16 — python313-rsa — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 11 November 2025 Affected versions: SLES 16 📖 ~4 min read  •  Source: SUSE advisory SUSE-CU-2021:254-1 (see also SUSE bugzilla) Related CVEs: CVE-2020-13757 CVE-2020-25658 Upstream summary: Python-RSA before 4.1 ignores leading '\0' bytes during decryption of ciphertext. This could conceivably have a security-relevant impact, e.g., by helping […]

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CentOS Stream 9 — libblockdev — vulnerability — patch and remediation guide — diagnosis and fix on CentOS Stream 9

CentOS Stream 9 — libblockdev — vulnerability — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 11 November 2025 Affected versions: CentOS Stream 9 📖 ~4 min read  •  Source: AlmaLinux/RHEL advisory ALSA-2025:9327 Related CVEs: CVE-2025-6019 Upstream summary: The libblockdev packages provide a C library with GObject introspection support used for low-level operations on block devices. The library serves as a thin wrapper […]

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SLES 16 — apache-commons-httpclient — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on SLES 16

SLES 16 — apache-commons-httpclient — multiple vulnerabilities (3 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 11 November 2025 Affected versions: SLES 16 📖 ~4 min read  •  Source: SUSE advisory SUSE-SU-2020:3149-1 (see also SUSE bugzilla) Related CVEs: CVE-2015-5262 CVE-2012-5783 CVE-2014-3577 Upstream summary: http/conn/ssl/SSLConnectionSocketFactory.java in Apache HttpComponents HttpClient before 4.3.6 ignores the http.socket.timeout configuration setting during an SSL handshake, which allows remote attackers […]

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How to Configure Nginx as a TCP/UDP Load Balancer on Debian 13 — step-by-step Debian 13 tutorial on Progressive Robot

How to Configure Nginx as a TCP/UDP Load Balancer on Debian 13

Introduction How to Configure Nginx as a TCP/UDP Load Balancer 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 […]

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How to Build Docker Images with Buildah on Debian 13 — step-by-step Debian 13 tutorial on Progressive Robot

How to Build Docker Images with Buildah on Debian 13

Introduction Debian 13 Trixie is built around the ethos of stability and free software. Setting up build docker images with buildah on Trixie leverages the same proven Debian packaging system that powers millions of servers worldwide, while benefiting from the latest upstream releases included in the Trixie freeze. Follow each step carefully and the resulting […]

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Common Problems 119465

Debian 13 DKMS Module Build Failure After Kernel Update

🔴 Critical   ⏱ 5–30 min  Last verified: 11 November 2025 Affected versions: Debian 13 📖 ~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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How to Configure Apache2 as a Reverse Proxy on Debian 13 — step-by-step Debian 13 tutorial on Progressive Robot

How to Configure Apache2 as a Reverse Proxy on Debian 13

Introduction Deploying configure apache2 as a reverse proxy on a Debian 13 Trixie machine is straightforward thanks to Debian’s policy-compliant packaging. Unlike rpm-based distributions, Debian stores configuration helpers in /etc/default/, uses update-rc.d for older init scripts, and provides dpkg-reconfigure for interactive package configuration. This tutorial stays on the systemd path throughout. Prerequisites Before you begin, […]

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How to Install and Use Helm for Kubernetes Package Management on RHEL 9 — step-by-step RHEL 9 tutorial on Progressive Robot

How to Install and Use Helm for Kubernetes Package Management on RHEL 9

Helm is the standard Kubernetes package manager — a single helm install command deploys a complete application stack by rendering and applying a collection of templated Kubernetes manifests called a chart. Beyond basic installation, Helm provides powerful package management workflows: multiple simultaneous releases of the same chart with different configurations, chart dependencies (a parent chart […]

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