Operations

openSUSE Tumbleweed — kcron — vulnerability — patch and remediation guide — diagnosis and fix on openSUSE Tumbleweed

openSUSE Tumbleweed — kcron — vulnerability — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: openSUSE Tumbleweed 📖 ~4 min read  •  Source: SUSE security advisory (see also SUSE bugzilla) Related CVEs: CVE-2022-24986 Upstream summary: KDE KCron through 21.12.2 uses a temporary file in /tmp when saving, but reuses the filename during an editing session. Thus, someone […]

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Ubuntu 14.04 — isc-dhcp — multiple vulnerabilities (8 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 14.04

Ubuntu 14.04 — isc-dhcp — multiple vulnerabilities (8 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 22 October 2022 Affected versions: Ubuntu 14.04 (trusty) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-5658-3 Related CVEs: CVE-2022-2928 CVE-2022-2929 CVE-2021-25217 CVE-2016-2774 CVE-2017-3144 CVE-2018-5732 CVE-2018-5733 CVE-2015-8605 Upstream summary: USN-5658-1 fixed several vulnerabilities in DHCP. This update provides the corresponding update for Ubuntu 14.04 ESM. Original […]

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Ubuntu 22.04 — jqueryui — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 22.04

Ubuntu 22.04 — jqueryui — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 22 October 2022 Affected versions: Ubuntu 22.04 (jammy) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-5181-1 Related CVEs: CVE-2021-41184 CVE-2022-31160 Upstream summary: It was discovered that jQuery UI did not properly validate the values from untrusted sources. An attacker could use this vulnerability to cause […]

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How to Configure Kerberos Authentication on RHEL 9 — step-by-step RHEL 9 tutorial on Progressive Robot

How to Configure Kerberos Authentication on RHEL 9

Kerberos is a network authentication protocol that uses symmetric-key cryptography and a trusted third party — the Key Distribution Center (KDC) — to authenticate users and services without transmitting passwords over the network. RHEL 9 ships the MIT Kerberos implementation and it integrates tightly with SSH, NFS, and other network services through GSSAPI. This tutorial […]

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Common Problems 118599

Ubuntu 16.04 LTS Chrony Not Syncing Due to Firewall Policy

🟡 Medium   ⏱ 5–30 min  Last verified: 21 October 2022 Affected versions: 16.04 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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Debian 11 — minetest — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — minetest — multiple vulnerabilities (3 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 21 October 2022 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2022-24300 CVE-2022-24301 CVE-2022-35978 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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Gentoo Linux — sys-apps/systemd — multiple vulnerabilities (7 CVEs) — patch and remediation guide — diagnosis and fix on Gentoo Linux

Gentoo Linux — sys-apps/systemd — multiple vulnerabilities (7 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Gentoo Linux 📖 ~4 min read  •  Source: Gentoo GLSA GLSA-202003-20 Related CVEs: CVE-2020-1712 CVE-2022-4415 CVE-2022-45873 CVE-2021-3997 CVE-2022-3821 CVE-2020-13529 CVE-2021-33910 Upstream summary: It was found that systemd incorrectly handled certain Polkit queries. Table of contents Symptom & Impact Environment & Reproduction Root […]

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Common Problems 117047

Ubuntu 22.04 GNOME Login Loop After Graphics Stack Changes

🟡 Medium   ⏱ 5–30 min  Last verified: 21 October 2022 📖 ~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 111749

Windows Server 2022 — Group Policy Objects Not Applying to OU After Security Filtering Changes — Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 21 October 2022 Affected versions: Windows Server 2022 📖 ~1 min read Table of contents Symptom & Impact Quick Checks Deep Diagnosis Primary Fix Verification Prevention & Hardening Symptom & Impact Expected policies no longer apply to servers in a target OU after delegation or filtering updates. […]

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