Common Problems

Oracle Linux 8 — Unbreakable Enterprise kernel — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — Unbreakable Enterprise kernel — vulnerability — patch and remediation guide (ELSA-2021-9362)

🟠 High   ⏱ 15–60 min  Last verified: 9 August 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2021-9362 Related CVEs: CVE-2021-23133 CVE-2020-25671 CVE-2021-33033 CVE-2020-25670 CVE-2021-32399 CVE-2020-25672 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – […]

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openSUSE Tumbleweed — libmono — multiple vulnerabilities (4 CVEs) — patch and remediation guide — diagnosis and fix on openSUSE Tumbleweed

openSUSE Tumbleweed — libmono — multiple vulnerabilities (4 CVEs) — patch and remediation guide

🔴 Critical   ⏱ 15–90 min  Last verified: 25 May 2026 Affected versions: openSUSE Tumbleweed 📖 ~4 min read  •  Source: SUSE security advisory Related CVEs: CVE-2021-24112 CVE-2015-2318 CVE-2015-2319 CVE-2015-2320 Upstream summary: Unknown. Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – […]

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FreeBSD 13 — openjdk — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 13

FreeBSD 13 — openjdk — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 9 August 2021 Affected versions: FreeBSD 13 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: java — multiple vulnerabilities Related CVEs: CVE-2012-4681 CVE-2013-0433 CVE-2015-4734 CVE-2015-4803 CVE-2015-4805 CVE-2015-4806 CVE-2015-4810 CVE-2015-4835  +12 more Upstream summary: Oracle reports: This Critical Patch Update contains 25 new security fixes for […]

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Oracle Linux 8 — microcode_ctl security, — bug-fix and enhancement update — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — microcode_ctl security, — bug-fix and enhancement update (ELSA-2020-5085)

🟡 Medium   ⏱ 10–30 min  Last verified: 8 August 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2020-5085 Related CVEs: CVE-2020-8696 CVE-2020-8695 CVE-2020-8698 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 118395

apt update Returns 404 Errors on Ubuntu 16.04

🟡 Medium   ⏱ 5–30 min  Last verified: 8 August 2021 📖 ~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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FreeBSD 13 — perl-threaded — multiple vulnerabilities (5 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 13

FreeBSD 13 — perl-threaded — multiple vulnerabilities (5 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 8 August 2021 Affected versions: FreeBSD 13 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: perl — denial of service via algorithmic complexity attack on hashing routines Related CVEs: CVE-2004-0452 CVE-2005-0155 CVE-2005-0156 CVE-2007-5116 CVE-2013-1667 Upstream summary: Perl developers report: In order to prevent an algorithmic […]

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Common Problems 117600

Ubuntu 20.04 LTS APT GPG Signature Verification Failed

🟡 Medium   ⏱ 5–30 min  Last verified: 8 August 2021 📖 ~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 112633

Windows Server 2019 — Jumbo frame MTU mismatch across virtual and physical switches fragments storage traffic — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 8 August 2021 Affected versions: Windows Server 2019 📖 ~2 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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FreeBSD 13 — metamail — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 13

FreeBSD 13 — metamail — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 8 August 2021 Affected versions: FreeBSD 13 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: metamail format string bugs and buffer overflows Related CVEs: CVE-2004-0104 CVE-2004-0105 Upstream summary: Ulf Härnhammar reported four bugs in metamail: two are format string bugs and two are buffer overflows. […]

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FreeBSD 13 — libgd — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 13

FreeBSD 13 — libgd — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 8 August 2021 Affected versions: FreeBSD 13 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: libgd — Denial of servica via double free Related CVEs: CVE-2017-6362 CVE-2017-7890 Upstream summary: libgd developers report: Double free vulnerability in the gdImagePngPtr function in libgd2 before 2.2.5 allows remote […]

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