Linux

Common Problems 115048

RHEL 8 High IOWait Caused by Unbounded Persistent Journald Logs

🟡 Medium   ⏱ 5–30 min  Last verified: 5 September 2019 📖 ~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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Amazon Linux 2 — libcgroup — vulnerability — patch and remediation guide — diagnosis and fix on Amazon Linux 2

Amazon Linux 2 — libcgroup — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Amazon Linux 2 📖 ~4 min read  •  Source: Amazon Linux advisory ALAS2-2019-1336 Related CVEs: CVE-2018-14348 Upstream summary: libcgroup up to and including 0.41 creates /var/log/cgred with mode 0666 regardless of the configured umask, leading to disclosure of information.(CVE-2018-14348) Table of contents […]

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Ubuntu 18.04 — ruby-nokogiri — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 18.04

Ubuntu 18.04 — ruby-nokogiri — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 5 September 2019 Affected versions: Ubuntu 18.04 (bionic) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4175-1 Related CVEs: CVE-2019-5477 Upstream summary: It was discovered that Nokogiri incorrectly handled inputs. A remote attacker could possibly use this issue to execute arbitrary OS commands. Table of contents […]

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How to Install Rust with rustup on Debian 9 — step-by-step Debian 9 tutorial on Progressive Robot

How to Install Rust with rustup on Debian 9

Introduction This guide explains how to Install Rust with rustup on Debian 9 on Debian 9 Stretch. Debian Stretch uses systemd for service management, nftables as the underlying packet filter (with ufw or iptables front-ends still available), and AppArmor for mandatory access control. Every command is designed for a minimal Debian 9 install with the […]

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Common Problems 115632

RHEL 7 firewalld Direct Rules Lost After Reload

🟡 Medium   ⏱ 5–30 min  Last verified: 4 September 2019 Affected versions: RHEL 7 📖 ~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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openSUSE Tumbleweed — libHX28 — vulnerability — patch and remediation guide — diagnosis and fix on openSUSE Tumbleweed

openSUSE Tumbleweed — libHX28 — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: openSUSE Tumbleweed 📖 ~4 min read  •  Source: SUSE advisory SUSE-SR:2010:019 (see also SUSE bugzilla) Related CVEs: CVE-2010-2947 Upstream summary: Heap-based buffer overflow in the HX_split function in string.c in libHX before 3.6 allows remote attackers to execute arbitrary code or cause […]

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Common Problems 115081

RHEL 8 Cockpit Web Console Unreachable After Firewall Policy Change

🟡 Medium   ⏱ 5–30 min  Last verified: 4 September 2019 📖 ~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 9 — libpng1.6 — vulnerability — patch and remediation guide — diagnosis and fix on Debian 9

Debian 9 — libpng1.6 — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 4 September 2019 Affected versions: Debian 9 (stretch) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2019-7317 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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