Common Problems

Oracle Linux 8 — virt:ol and virt-devel:ol — security and stability fixes — required update — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — virt:ol and virt-devel:ol — security and stability fixes — required update (ELSA-2023-0099)

🟢 Low   ⏱ 5–15 min  Last verified: 16 December 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2023-0099 Related CVEs: CVE-2022-4144 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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Ubuntu 16.04 — libpam-krb5 — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

Ubuntu 16.04 — libpam-krb5 — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 16 December 2020 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4314-1 Related CVEs: CVE-2020-10595 Upstream summary: Russ Allbery discovered that pam-krb5 incorrectly handled some responses. An attacker could possibly use this issue to execute arbitrary code. Table of contents Symptom […]

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Common Problems 113560

Windows Server 2012 R2 — AD Recycle Bin recovery needed to restore accidentally deleted user object — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 16 December 2020 Affected versions: Windows Server 2012 R2 📖 ~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 […]

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Gentoo Linux — dev-python/jinja — vulnerability — patch and remediation guide — diagnosis and fix on Gentoo Linux

Gentoo Linux — dev-python/jinja — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 25 May 2026 Affected versions: Gentoo Linux 📖 ~4 min read  •  Source: Gentoo GLSA GLSA-202107-19 Related CVEs: CVE-2020-28493 Upstream summary: The ‘urlize’ filter in Jinja utilized an inefficient regular expression that could be exploited to consume excess CPU. Table of contents Symptom & Impact Environment & […]

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Common Problems 113133

Windows Server 2016 — Netlogon service secure channel startup failures — Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 16 December 2020 Affected versions: Windows Server 2016 📖 ~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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Ubuntu 16.04 — freerdp — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

Ubuntu 16.04 — freerdp — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 16 December 2020 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4382-1 Related CVEs: CVE-2020-11042 CVE-2020-11045 CVE-2020-11046 CVE-2020-11048 CVE-2020-11049 CVE-2020-11058 CVE-2020-11521 CVE-2020-11522  +12 more Upstream summary: It was discovered that FreeRDP incorrectly handled certain memory operations. A remote attacker could use […]

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SLES 15 — lua53 — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on SLES 15

SLES 15 — lua53 — multiple vulnerabilities (3 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 16 December 2020 Affected versions: SLES 15 📖 ~4 min read  •  Source: SUSE advisory SUSE-CU-2019:697-1 (see also SUSE bugzilla) Related CVEs: CVE-2019-6706 CVE-2020-24370 CVE-2020-24371 Upstream summary: Lua 5.3.5 has a use-after-free in lua_upvaluejoin in lapi.c. For example, a crash outcome might be achieved by an attacker […]

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Oracle Linux 8 — java-11-openjdk — security and stability fixes — required update — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — java-11-openjdk — security and stability fixes — required update (ELSA-2023-0200)

🟡 Medium   ⏱ 10–30 min  Last verified: 15 December 2020 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2023-0200 Related CVEs: CVE-2023-21835 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 121494

Debian 9 – dist-upgrade aborts with held broken packages

🟠 High   ⏱ 5–30 min  Last verified: 15 December 2020 Affected versions: Debian 9 📖 ~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 117988

Ubuntu 18.04 LTS – systemd service enters crash loop after package update – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 15 December 2020 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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