Linux

AlmaLinux 8 — libXau — vulnerability — patch and remediation guide — diagnosis and fix on AlmaLinux 8

AlmaLinux 8 — libXau — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: AlmaLinux 8 📖 ~4 min read  •  Source: AlmaLinux ALSA ALEA-2020:4742 Upstream summary: For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section. Table of contents Symptom & Impact Environment & Reproduction Root Cause […]

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Common Problems 118542

Ubuntu 16.04 UFW Blocks Required Service Ports

🟡 Medium   ⏱ 5–30 min  Last verified: 1 May 2021 📖 ~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 8 — spirv-tools — vulnerability — patch and remediation guide — diagnosis and fix on AlmaLinux 8

AlmaLinux 8 — spirv-tools — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: AlmaLinux 8 📖 ~4 min read  •  Source: AlmaLinux ALSA ALEA-2022:1962 Upstream summary: For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section. Table of contents Symptom & Impact Environment & Reproduction Root Cause […]

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How to Set Up Loki and Promtail for Log Aggregation on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Set Up Loki and Promtail for Log Aggregation on RHEL 8

Loki is a horizontally scalable, highly available log aggregation system designed by Grafana Labs to index only metadata rather than full log content, making it extremely cost-efficient compared to Elasticsearch-based stacks. Promtail is the companion agent that tails local log files, attaches labels, and ships entries to Loki over HTTP. In this tutorial you will […]

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Alpine Linux edge — opensmtpd — vulnerability — patch and remediation guide — diagnosis and fix on Alpine Linux edge

Alpine Linux edge — opensmtpd — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Alpine Linux edge / fixed in 6.6.2p1-r0 📖 ~4 min read  •  Source: Alpine secdb entry — opensmtpd 6.6.2p1-r0 Related CVEs: CVE-2020-7247 Upstream summary: Alpine community repository for vedge ships opensmtpd 6.6.2p1-r0 which addresses CVE-2020-7247. Table of contents Symptom & Impact Environment […]

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Arch Linux — libxml2 — multiple vulnerabilities (6 CVEs) — patch and remediation guide — diagnosis and fix on Arch Linux

Arch Linux — libxml2 — multiple vulnerabilities (6 CVEs) — patch and remediation guide

🔴 Critical   ⏱ 15–90 min  Last verified: 25 May 2026 Affected versions: Arch Linux (rolling release) 📖 ~4 min read  •  Source: Arch ASA ASA-201611-2 Related CVEs: CVE-2016-5131 CVE-2016-4658 CVE-2020-7595 CVE-2020-24977 CVE-2019-20388 CVE-2018-9251 Upstream summary: Type: arbitrary code execution. Status: Fixed. Affected: 2.9.4+4+g3169602-1. Fixed in: 2.9.4+12+ge905f08-1. Group: AVG-56. Table of contents Symptom & Impact […]

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Ubuntu 20.04 — libspf2 — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — libspf2 — multiple vulnerabilities (3 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 1 May 2021 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-6584-1 Related CVEs: CVE-2021-20314 CVE-2021-33912 CVE-2021-33913 Upstream summary: Philipp Jeitner and Haya Shulman discovered that Libspf2 incorrectly handled certain inputs. If a user or an automated system were tricked into […]

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Oracle Linux 8 — grafana security, bug fix, and — enhancement update — new behaviour and fixes — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — grafana security, bug fix, and — enhancement update — new behaviour and fixes (ELSA-2021-4226)

🟡 Medium   ⏱ 10–30 min  Last verified: 30 April 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2021-4226 Related CVEs: CVE-2021-33195 CVE-2021-34558 CVE-2021-27358 CVE-2021-3114 CVE-2021-33197 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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Common Problems 118094

Ubuntu 18.04 VPN connection fails to establish

🟡 Medium   ⏱ 5–30 min  Last verified: 30 April 2021 📖 ~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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