Linux

Common Problems 117909

Ubuntu 18.04 LTS DNS Resolution Intermittently Fails

🟡 Medium   ⏱ 5–30 min  Last verified: 29 August 2019 Affected versions: 18.04 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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How to Configure DNSSEC on RHEL 7 — step-by-step RHEL 7 tutorial on Progressive Robot

How to Configure DNSSEC on RHEL 7

How to Configure DNSSEC on RHEL 7 DNS Security Extensions (DNSSEC) add a layer of cryptographic verification to the Domain Name System, protecting users from cache poisoning attacks, man-in-the-middle redirects, and forged DNS responses. By digitally signing DNS zone data, DNSSEC allows resolvers to confirm that the records they receive are authentic and unmodified. This […]

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openSUSE Tumbleweed — gd — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on openSUSE Tumbleweed

openSUSE Tumbleweed — gd — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: openSUSE Tumbleweed 📖 ~4 min read  •  Source: SUSE advisory SUSE-SA:2007:044 (see also SUSE bugzilla) Related CVEs: CVE-2007-2756 CVE-2016-10166 CVE-2016-10168 CVE-2016-5116 CVE-2016-5766 CVE-2016-6128 CVE-2016-6132 CVE-2016-6207  +12 more Upstream summary: The gdPngReadData function in libgd 2.0.34 allows user-assisted attackers to cause a denial […]

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SLES 15 — pam_ssh — vulnerability — patch and remediation guide — diagnosis and fix on SLES 15

SLES 15 — pam_ssh — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 29 August 2019 Affected versions: SLES 15 📖 ~4 min read  •  Source: SUSE security advisory (see also SUSE bugzilla) Related CVEs: CVE-2009-1273 Upstream summary: pam_ssh 1.92 and possibly other versions, as used when PAM is compiled with USE=ssh, generates different error messages depending on whether the […]

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Common Problems 117903

Ubuntu 18.04 LTS stuck in emergency mode after filesystem errors

🟡 Medium   ⏱ 5–30 min  Last verified: 28 August 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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Common Problems 117896

Ubuntu 18.04 LTS – apt update fails with NO_PUBKEY for third-party repository – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 28 August 2019 Affected versions: Ubuntu 18.04 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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