Common Problems

Oracle Linux 9 — KVM Virtual Machines Panic When Started on Oracle Linux 9 Hosts — diagnosis and fix on Oracle Linux 9

Oracle Linux 9 — KVM Virtual Machines Panic When Started on Oracle Linux 9 Hosts

🟠 High   ⏱ 5–30 min  Last verified: 25 May 2026 Affected versions: Oracle Linux 9 📖 ~4 min read  •  Source: Oracle Bug 34224821 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 […]

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pr cp 117014 r2

Ubuntu 22.04 LTS SSH Service Fails After Host Key Permission Change

🟡 Medium   ⏱ 5–30 min  Last verified: 19 May 2026 📖 ~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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Oracle Linux 8 — File System Issues — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — File System Issues (OL8-ISSUES-FS)

🟠 High   ⏱ 5–30 min  Last verified: 25 May 2026 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: Oracle Bug OLRNT-ol8-issues-fs 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 […]

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pr cp 117514 r2

Ubuntu 20.04 LTS UFW Blocks Required Service Ports

🟡 Medium   ⏱ 5–30 min  Last verified: 19 May 2026 📖 ~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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SLES 16 — python313-PyJWT — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on SLES 16

SLES 16 — python313-PyJWT — multiple vulnerabilities (3 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: SLES 16 📖 ~4 min read  •  Source: SUSE advisory RHSA-2026:12176 (see also SUSE bugzilla) Related CVEs: CVE-2026-32597 CVE-2022-29217 CVE-2024-53861 Upstream summary: PyJWT is a JSON Web Token implementation in Python. Prior to 2.12.0, PyJWT does not validate the crit (Critical) Header […]

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pr cp 118013 r2

Ubuntu 18.04 LTS Netplan apply breaks remote connectivity

🟡 Medium   ⏱ 5–30 min  Last verified: 19 May 2026 📖 ~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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SLES 15 — perl-Text-CSV_XS — vulnerability — patch and remediation guide — diagnosis and fix on SLES 15

SLES 15 — perl-Text-CSV_XS — vulnerability — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: SLES 15 📖 ~4 min read  •  Source: SUSE advisory SUSE-SU-2026:1936-1 (see also SUSE bugzilla) Related CVEs: CVE-2026-7111 Upstream summary: Text::CSV_XS versions before 1.62 for Perl have a use-after-free when registered callbacks extend the Perl argument stack, which may enable type confusion […]

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pr cp 118507 r2

Ubuntu 16.04 LTS Apache2 fails to start because port 80 is in use

🟡 Medium   ⏱ 5–30 min  Last verified: 19 May 2026 📖 ~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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SLES 12 — libpng16 — multiple vulnerabilities (8 CVEs) — patch and remediation guide — diagnosis and fix on SLES 12

SLES 12 — libpng16 — multiple vulnerabilities (8 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: SLES 12 📖 ~4 min read  •  Source: SUSE advisory RHSA-2026:0125 (see also SUSE bugzilla) Related CVEs: CVE-2025-66293 CVE-2014-9495 CVE-2015-0973 CVE-2026-22695 CVE-2025-64506 CVE-2025-64720 CVE-2025-65018 CVE-2014-0333 Upstream summary: LIBPNG is a reference library for use in applications that read, create, and manipulate PNG […]

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pr cp 119043 r2

Ubuntu 14.04 LTS MySQL service fails to start

🟡 Medium   ⏱ 5–30 min  Last verified: 19 May 2026 📖 ~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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