Common Problems

Common Problems 115413

RHEL 7 – GPG Key Mismatch Prevents Yum Package Validation

🟡 Medium   ⏱ 5–30 min  Last verified: 29 September 2020 📖 ~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 16.04 — golang-websocket — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

Ubuntu 16.04 — golang-websocket — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 29 September 2020 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-6208-1 Related CVEs: CVE-2020-27813 Upstream summary: It was discovered that Gorilla WebSocket incorrectly handled decoding WebSocket frames. An attacker could possibly use this issue to cause a crash, resulting in […]

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Arch Linux — python-jinja — vulnerability — patch and remediation guide — diagnosis and fix on Arch Linux

Arch Linux — python-jinja — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 25 May 2026 Affected versions: Arch Linux (rolling release) 📖 ~4 min read  •  Source: Arch ASA ASA-202102-19 Related CVEs: CVE-2020-28493 Upstream summary: Type: denial of service. Status: Fixed. Affected: 2.11.2-4. Fixed in: 2.11.3-1. Group: AVG-1523. Table of contents Symptom & Impact Environment & Reproduction Root Cause […]

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Ubuntu 18.04 — linux-aws-5.3 — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 18.04

Ubuntu 18.04 — linux-aws-5.3 — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 29 September 2020 Affected versions: Ubuntu 18.04 (bionic) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4489-1 Related CVEs: CVE-2020-14386 CVE-2020-14356 CVE-2020-12655 CVE-2020-12771 CVE-2020-15393 CVE-2020-24394 CVE-2019-16089 CVE-2019-19462  +12 more Upstream summary: Or Cohen discovered that the AF_PACKET implementation in the Linux kernel did not properly perform […]

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Oracle Linux 8 — qt5-qtbase and qt5-qtwebsockets — security and stability fixes — required update — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — qt5-qtbase and qt5-qtwebsockets — security and stability fixes — required update (ELSA-2020-4690)

🟡 Medium   ⏱ 10–30 min  Last verified: 28 September 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2020-4690 Related CVEs: CVE-2020-0569 CVE-2018-21035 CVE-2020-13962 CVE-2015-9541 CVE-2020-0570 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 114902

RHEL 8 RPM Database Locked or Corrupted During Package Operations

🟠 High   ⏱ 5–30 min  Last verified: 28 September 2020 Affected versions: 8.4 8.5 8.6 8.7 8.8 8.9 8.10 📖 ~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 […]

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Ubuntu 20.04 — libpam-tacplus — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — libpam-tacplus — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 28 September 2020 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4521-1 Related CVEs: CVE-2020-13881 Upstream summary: It was discovered that pam_tacplus did not properly manage shared secrets if DEBUG loglevel and journald are used. A remote attacker could use this […]

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Oracle Linux 8 — java-1.8.0-openjdk — security and stability fixes — required update — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — java-1.8.0-openjdk — security and stability fixes — required update (ELSA-2023-0208)

🟡 Medium   ⏱ 10–30 min  Last verified: 27 September 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2023-0208 Related CVEs: CVE-2023-21830 CVE-2023-21843 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & […]

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Common Problems 119028

Ubuntu 14.04 LTS LVM Resize Completed but Filesystem Size Unchanged

🟡 Medium   ⏱ 5–30 min  Last verified: 27 September 2020 📖 ~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 115578

RHEL 7 systemctl Reports Start Limit Hit for API Service

🟡 Medium   ⏱ 5–30 min  Last verified: 27 September 2020 📖 ~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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