ubuntu

Ubuntu 18.04 — linux-azure-4.15 — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 18.04

Ubuntu 18.04 — linux-azure-4.15 — multiple vulnerabilities (20 CVEs) — patch and remediation guide

  • June 20, 2026
  • Linux
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🟠 High   ⏱ 15–60 min  Last verified: 20 June 2026 Affected versions: Ubuntu 18.04 (bionic) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-8281-2 Related CVEs: CVE-2026-31431 CVE-2026-31504 CVE-2026-43033 CVE-2026-43077 CVE-2026-43078 CVE-2024-27388 CVE-2024-46816 CVE-2024-49938  +12 more Upstream summary: It was discovered that the Linux kernel algif_aead module did not properly handle in-place cryptographic […]

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Common Problems 116055

Ubuntu 26.04 LTS – NGINX fails reload due to duplicate server_name – Fix & Prevention

  • June 19, 2026
  • Linux
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🟡 Medium   ⏱ 5–30 min  Last verified: 19 June 2026 Affected versions: Ubuntu 26.04 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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Ubuntu 24.04 — python-keystonemiddleware — vulnerability — patch and remediation guide — diagnosis and fix on Ubuntu 24.04

Ubuntu 24.04 — python-keystonemiddleware — vulnerability — patch and remediation guide

  • June 19, 2026
  • Linux
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🟢 Low   ⏱ 5–15 min  Last verified: 19 June 2026 Affected versions: Ubuntu 24.04 (noble) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-8008-1 Related CVEs: CVE-2026-22797 Upstream summary: Grzegorz Grasza discovered that the Keystone Middleware incorrectly sanitized authentication headers before processing OAuth 2.0 tokens. An attacker could possibly use this issue to […]

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Ubuntu 16.04 — openjdk-8 — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

Ubuntu 16.04 — openjdk-8 — multiple vulnerabilities (20 CVEs) — patch and remediation guide

  • June 19, 2026
  • Linux
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🟠 High   ⏱ 15–60 min  Last verified: 19 June 2026 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-8000-1 Related CVEs: CVE-2026-21932 CVE-2026-21925 CVE-2026-21933 CVE-2026-21945 CVE-2025-53057 CVE-2025-53066 CVE-2025-30749 CVE-2025-30761  +12 more Upstream summary: It was discovered that the RMI component of OpenJDK 8 would establish RMI TCP endpoint […]

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Ubuntu 20.04 — libxml2 — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — libxml2 — multiple vulnerabilities (20 CVEs) — patch and remediation guide

  • June 19, 2026
  • Linux
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🟠 High   ⏱ 15–60 min  Last verified: 19 June 2026 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-7974-1 Related CVEs: CVE-2026-0992 CVE-2026-0990 CVE-2025-8732 CVE-2026-0989 CVE-2025-7425 CVE-2025-9714 CVE-2025-6021 CVE-2025-49794  +12 more Upstream summary: It was discovered that libxml2 incorrectly handled maliciously crafted SGML catalog files. An attacker could […]

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Common Problems 116087

Ubuntu 26.04 LTS – Docker containers lose DNS after daemon restart – Fix & Prevention

  • June 19, 2026
  • Linux
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🟠 High   ⏱ 5–30 min  Last verified: 19 June 2026 Affected versions: Ubuntu 26.04 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 116120

Ubuntu 26.04 LTS TLS Failures Due to Outdated CA Certificates

  • June 18, 2026
  • Linux
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🟠 High   ⏱ 5–30 min  Last verified: 18 June 2026 Affected versions: Ubuntu 26.04 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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How to Configure Unattended Upgrades on Ubuntu 26.04 — step-by-step Linux tutorial on Progressive Robot

How to Set Up UFW Firewall on Ubuntu 26.04

  • June 18, 2026
  • Linux
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UFW (Uncomplicated Firewall) is the default firewall management tool on Ubuntu. It wraps iptables with a simplified interface, making it easy to allow or deny traffic by port, service name, or IP range. This guide shows you how to set up and manage UFW on Ubuntu 26.04 LTS. Tested and valid on: Ubuntu 26.04 LTS […]

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Ubuntu 20.04 — cjson — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — cjson — multiple vulnerabilities (3 CVEs) — patch and remediation guide

  • June 18, 2026
  • Linux
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🟡 Medium   ⏱ 10–30 min  Last verified: 18 June 2026 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-7973-1 Related CVEs: CVE-2023-53154 CVE-2025-57052 CVE-2023-26819 Upstream summary: It was discovered that cJSON incorrectly handled parsing large numbers. An attacker could possibly use this issue to cause a denial of […]

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Ubuntu 16.04 — ghostscript — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

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

  • June 18, 2026
  • Linux
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🟠 High   ⏱ 15–60 min  Last verified: 18 June 2026 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-7904-1 Related CVEs: CVE-2025-59799 CVE-2025-59798 CVE-2024-56827 CVE-2025-48708 CVE-2024-29508 CVE-2025-27836 CVE-2025-27832 CVE-2025-27835  +12 more Upstream summary: Piotr Kajda discovered that Ghostscript incorrectly handled writing certain files. An attacker could possibly use […]

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