Linux

Common Problems 114523

RHEL 9 systemd-resolved DNS lookup delays on servers

🟡 Medium   ⏱ 5–30 min  Last verified: 28 October 2022 📖 ~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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Ubuntu 14.04 — busybox — multiple vulnerabilities (12 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 14.04

Ubuntu 14.04 — busybox — multiple vulnerabilities (12 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 28 October 2022 Affected versions: Ubuntu 14.04 (trusty) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-6335-1 Related CVEs: CVE-2021-28831 CVE-2022-48174 CVE-2011-5325 CVE-2014-9645 CVE-2015-9261 CVE-2016-2147 CVE-2016-2148 CVE-2017-15873  +4 more Upstream summary: It was discovered that BusyBox incorrectly handled certain malformed gzip archives. If a user or […]

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Oracle Linux 8 — compat-openssl10 — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — compat-openssl10 — vulnerability — patch and remediation guide (ELSA-2022-5326)

🟢 Low   ⏱ 5–15 min  Last verified: 28 October 2022 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2022-5326 Related CVEs: CVE-2022-0778 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 — rsync — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 9

Oracle Linux 9 — rsync — vulnerability — patch and remediation guide (ELSA-2022-4592)

🟠 High   ⏱ 15–60 min  Last verified: 28 October 2022 Affected versions: Oracle Linux 9 📖 ~4 min read  •  Source: ELSA advisory ELSA-2022-4592 Related CVEs: CVE-2018-25032 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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How to Install and Configure BIND9 DNS Server on Debian 11 — step-by-step Debian 11 tutorial on Progressive Robot

How to Install and Configure BIND9 DNS Server on Debian 11

Introduction How to Install and Configure BIND9 DNS Server on Debian 11 is a fundamental operation for any administrator maintaining a Debian 11 Bullseye server. Debian 11 Bullseye 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 […]

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Common Problems 118592

Ubuntu 16.04 LTS – Apache fails to start with Address already in use – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 27 October 2022 Affected versions: Ubuntu 16.04 LTS 📖 ~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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Alpine Linux edge — pidgin — vulnerability — patch and remediation guide — diagnosis and fix on Alpine Linux edge

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

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Alpine Linux edge / fixed in 2.14.9-r0 📖 ~4 min read  •  Source: Alpine secdb entry — pidgin 2.14.9-r0 Related CVEs: CVE-2022-26491 Upstream summary: Alpine community repository for vedge ships pidgin 2.14.9-r0 which addresses CVE-2022-26491. Table of contents Symptom & Impact Environment […]

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

Debian 11 — netpbm-free — multiple vulnerabilities (8 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 27 October 2022 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2003-0146 CVE-2003-0924 CVE-2005-2471 CVE-2005-2978 CVE-2005-3632 CVE-2005-3662 CVE-2008-0554 CVE-2009-4274 Upstream summary: Multiple vulnerabilities in NetPBM 9.20 and earlier, and possibly other versions, may allow remote attackers to cause a […]

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Ubuntu 18.04 — linux-gkeop-5.4 — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 18.04

Ubuntu 18.04 — linux-gkeop-5.4 — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 27 October 2022 Affected versions: Ubuntu 18.04 (bionic) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-5562-1 Related CVEs: CVE-2022-0494 CVE-2022-1048 CVE-2022-1652 CVE-2022-1679 CVE-2022-1734 CVE-2022-1974 CVE-2022-1975 CVE-2022-2586  +12 more Upstream summary: Zhenpeng Lin discovered that the network packet scheduler implementation in the Linux kernel did not […]

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