Common Problems

Oracle Linux 8 — kernel — security and stability fixes — required update — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — kernel — security and stability fixes — required update (ELSA-2021-2168)

🟠 High   ⏱ 15–60 min  Last verified: 4 June 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2021-2168 Related CVEs: CVE-2021-3543 CVE-2021-3501 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 118606

Ubuntu 16.04 LTS – TLS connections fail due to outdated CA certificates

🟠 High   ⏱ 5–30 min  Last verified: 4 June 2021 Affected versions: Ubuntu 16.04 LTS Ubuntu 16.04 Ubuntu 16.04.7 📖 ~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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Common Problems 117491

Ubuntu 20.04 LTS sudo Fails With PAM Authentication Error

🟠 High   ⏱ 5–30 min  Last verified: 4 June 2021 Affected versions: 20.04 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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Common Problems 112600

Windows Server 2019 NVMe Driver Mismatch Throttles Throughput After Patching – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 4 June 2021 Affected versions: Windows Server 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 […]

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FreeBSD 13 — mod_dosevasive — security advisory — patch and remediation guide — diagnosis and fix on FreeBSD 13

FreeBSD 13 — mod_dosevasive — security advisory — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 4 June 2021 Affected versions: FreeBSD 13 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: mod_dosevasive — insecure temporary file creation Upstream summary: An LSS Security Advisory reports: When a denial of service attack is detected, mod_dosevasive will, among other things, create a temporary file […]

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FreeBSD 13 — urban — vulnerability — patch and remediation guide — diagnosis and fix on FreeBSD 13

FreeBSD 13 — urban — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 4 June 2021 Affected versions: FreeBSD 13 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: urban — stack overflow vulnerabilities Related CVEs: CVE-2005-2864 Upstream summary: Several filename-related stack overflow bugs allow a local attacker to elevate its privileges to the games group, since urban is […]

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Arch Linux — firejail — vulnerability — patch and remediation guide — diagnosis and fix on Arch Linux

Arch Linux — firejail — vulnerability — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Arch Linux (rolling release) 📖 ~4 min read  •  Source: Arch ASA ASA-202102-26 Related CVEs: CVE-2021-26910 Upstream summary: Type: privilege escalation. Status: Fixed. Affected: 0.9.64.2-1. Fixed in: 0.9.64.4-1. Group: AVG-1545. Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis […]

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Oracle Linux 8 — tcpdump — security and stability fixes — required update — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — tcpdump — security and stability fixes — required update (ELSA-2021-4236)

🟢 Low   ⏱ 5–15 min  Last verified: 3 June 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2021-4236 Related CVEs: CVE-2020-8037 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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AlmaLinux 8 — intel-cmt-cat — vulnerability — patch and remediation guide — diagnosis and fix on AlmaLinux 8

AlmaLinux 8 — intel-cmt-cat — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: AlmaLinux 8 📖 ~4 min read  •  Source: AlmaLinux ALSA ALBA-2021:1696 Upstream summary: For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section. Table of contents Symptom & Impact Environment & Reproduction Root Cause […]

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