Linux

Common Problems 116418

Ubuntu 24.04 LTS APT NO_PUBKEY Signature Verification Failure

🟠 High   ⏱ 5–30 min  Last verified: 5 August 2025 Affected versions: Ubuntu 24.04 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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Oracle Linux 10 — tomcat — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 10

Oracle Linux 10 — tomcat — vulnerability — patch and remediation guide (ELSA-2025-7497)

🟡 Medium   ⏱ 10–30 min  Last verified: 5 August 2025 Affected versions: Oracle Linux 10 📖 ~4 min read  •  Source: ELSA advisory ELSA-2025-7497 Related CVEs: CVE-2024-52316 CVE-2024-54677 CVE-2025-24813 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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AlmaLinux 8 — perl-Sub-Install — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on AlmaLinux 8

AlmaLinux 8 — perl-Sub-Install — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: AlmaLinux 8 📖 ~4 min read  •  Source: AlmaLinux ALSA ALSA-2026:8096 Related CVEs: CVE-2025-40909 CVE-2023-47038 Upstream summary: Perl is a high-level programming language that is commonly used for system administration utilities and web programming. Security Fix(es): * perl: Perl threads have a […]

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Common Problems 116389

Ubuntu 24.04 LTS – apt lock prevents installs and updates – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 5 August 2025 Affected versions: Ubuntu 24.04 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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Oracle Linux 8 — pki-deps:10.6 — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — pki-deps:10.6 — vulnerability — patch and remediation guide (ELSA-2025-14126)

🟠 High   ⏱ 15–60 min  Last verified: 5 August 2025 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2025-14126 Related CVEs: CVE-2025-52999 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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Oracle Linux 8 — kernel — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — kernel — vulnerability — patch and remediation guide (ELSA-2025-14438)

🟡 Medium   ⏱ 10–30 min  Last verified: 5 August 2025 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2025-14438 Related CVEs: CVE-2025-22058 CVE-2025-38200 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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AlmaLinux 8 — perl-Encode-Locale — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on AlmaLinux 8

AlmaLinux 8 — perl-Encode-Locale — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: AlmaLinux 8 📖 ~4 min read  •  Source: AlmaLinux ALSA ALSA-2026:8096 Related CVEs: CVE-2025-40909 CVE-2023-47038 Upstream summary: Perl is a high-level programming language that is commonly used for system administration utilities and web programming. Security Fix(es): * perl: Perl threads have a […]

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CentOS Stream 9 — poppler — multiple vulnerabilities (4 CVEs) — patch and remediation guide — diagnosis and fix on CentOS Stream 9

CentOS Stream 9 — poppler — multiple vulnerabilities (4 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 5 August 2025 Affected versions: CentOS Stream 9 📖 ~4 min read  •  Source: AlmaLinux/RHEL advisory ALSA-2026:0126 Related CVEs: CVE-2025-32365 CVE-2024-6239 CVE-2022-38784 CVE-2022-27337 Upstream summary: Poppler is a Portable Document Format (PDF) rendering library, used by applications such as Evince. Security Fix(es): * poppler: Out-of-Bounds Read in […]

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How to Set Up Two-Factor Authentication (2FA) for SSH on Ubuntu 24.04 — step-by-step Linux tutorial on Progressive Robot

How to Use OpenSSL to Generate SSL Certificates on Ubuntu 24.04

OpenSSL is a powerful toolkit for SSL/TLS cryptography. This guide covers generating self-signed certificates, Certificate Signing Requests (CSRs), and a private Certificate Authority (CA) using OpenSSL on Ubuntu 24.04 LTS. Tested and valid on: Ubuntu 24.04 LTS Prerequisites Ubuntu 24.04 LTS server OpenSSL installed (pre-installed on Ubuntu 24.04) A user with sudo privileges Step 1 […]

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openSUSE Leap 15.6 — log4j — vulnerability — patch and remediation guide — diagnosis and fix on openSUSE Leap 15.6

openSUSE Leap 15.6 — log4j — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: openSUSE Leap 15.6 📖 ~4 min read  •  Source: SUSE advisory SUSE-SU-2026:0254-1 (see also SUSE bugzilla) Related CVEs: CVE-2025-68161 Upstream summary: The Socket Appender in Apache Log4j Core versions 2.0-beta9 through 2.25.2 does not perform TLS hostname verification of the peer certificate, […]

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