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Gentoo Linux — app-crypt/mit-krb5 — multiple vulnerabilities (6 CVEs) — patch and remediation guide — diagnosis and fix on Gentoo Linux

Gentoo Linux — app-crypt/mit-krb5 — multiple vulnerabilities (6 CVEs) — patch and remediation guide

  • July 5, 2024
  • Linux
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🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Gentoo Linux 📖 ~4 min read  •  Source: Gentoo GLSA GLSA-202405-11 Related CVEs: CVE-2021-36222 CVE-2021-37750 CVE-2022-42898 CVE-2023-36054 CVE-2023-39975 CVE-2020-28196 Upstream summary: Multiple vulnerabilities have been discovered in MIT krb5. Please review the CVE identifiers referenced below for details. Table of contents Symptom […]

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Common Problems 114440

Firewalld Blocking Required Application Port

🟡 Medium   ⏱ 5–30 min  Last verified: 2 July 2024 📖 ~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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How to Harden the Linux Kernel with sysctl on RHEL 9 — step-by-step RHEL 9 tutorial on Progressive Robot

How to Harden the Linux Kernel with sysctl on RHEL 9

  • June 26, 2024
  • Linux
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The Linux kernel exposes hundreds of tunable parameters through the sysctl interface that control network behavior, memory protection, and file system security. Many of these defaults prioritize compatibility over security. By writing a hardening configuration to /etc/sysctl.d/, you can reduce the kernel attack surface, enable mitigations against common network attacks, and enforce memory safety features […]

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openSUSE Tumbleweed — krb5 — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on openSUSE Tumbleweed

openSUSE Tumbleweed — krb5 — multiple vulnerabilities (20 CVEs) — patch and remediation guide

  • June 26, 2024
  • Linux
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🔴 Critical   ⏱ 15–90 min  Last verified: 25 May 2026 Affected versions: openSUSE Tumbleweed 📖 ~4 min read  •  Source: SUSE advisory SUSE-SA:2008:016 (see also SUSE bugzilla) Related CVEs: CVE-2008-0062 CVE-2009-4212 CVE-2024-37370 CVE-2024-26458 CVE-2024-26462 CVE-2023-39975 CVE-2023-36054 CVE-2002-2443  +12 more Upstream summary: KDC in MIT Kerberos 5 (krb5kdc) does not set a global variable for […]

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Common Problems 114522

RHEL 9 DNF Update Fails with GPG Signature Errors

  • June 24, 2024
  • Linux
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🟡 Medium   ⏱ 5–30 min  Last verified: 24 June 2024 📖 ~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 122702

Boot Loader Variables Not Persisting Across Reboot

🟡 Medium   ⏱ 5–30 min  Last verified: 20 June 2024 Affected versions: FreeBSD 14 📖 ~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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Oracle Linux 8 — krb5 — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — krb5 — vulnerability — patch and remediation guide (ELSA-2024-5312)

  • June 17, 2024
  • Linux
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🟡 Medium   ⏱ 10–30 min  Last verified: 17 June 2024 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2024-5312 Related CVEs: CVE-2024-37371 CVE-2024-37370 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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Ubuntu 14.04 — pam — multiple vulnerabilities (7 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 14.04

Ubuntu 14.04 — pam — multiple vulnerabilities (7 CVEs) — patch and remediation guide

  • June 16, 2024
  • Linux
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🟡 Medium   ⏱ 10–30 min  Last verified: 16 June 2024 Affected versions: Ubuntu 14.04 (trusty) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-6588-2 Related CVEs: CVE-2024-22365 CVE-2022-28321 https://launchpad.net/bugs/2006073 https://launchpad.net/bugs/1558114 CVE-2013-7041 CVE-2014-2583 CVE-2015-3238 Upstream summary: USN-6588-1 fixed a vulnerability in PAM. This update provides the corresponding updates for Ubuntu 14.04 LTS, Ubuntu 16.04 […]

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Common Problems 114400

Subscription Repositories Not Enabled in RHEL 9

🟡 Medium   ⏱ 5–30 min  Last verified: 10 June 2024 📖 ~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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How to Set Up Uptime Kuma for Service Monitoring on RHEL 9 — step-by-step RHEL 9 tutorial on Progressive Robot

How to Set Up Uptime Kuma for Service Monitoring on RHEL 9

  • June 7, 2024
  • Linux
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Uptime Kuma is a self-hosted monitoring tool that provides a clean web dashboard for tracking uptime across HTTP endpoints, TCP ports, DNS records, Docker containers, and more. On RHEL 9, you can run it directly with Node.js and PM2 for process management, or deploy it instantly via Docker. This tutorial walks through both approaches, firewall […]

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