Linux

SLES 15 — log4j — multiple vulnerabilities (15 CVEs) — patch and remediation guide — diagnosis and fix on SLES 15

SLES 15 — log4j — multiple vulnerabilities (15 CVEs) — patch and remediation guide

  • May 22, 2026
  • Linux
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🔴 Critical   ⏱ 15–90 min  Last verified: 25 May 2026 Affected versions: SLES 15 📖 ~4 min read  •  Source: SUSE advisory BLOG-LOG4SHELL (see also SUSE bugzilla) Related CVEs: CVE-2021-44228 CVE-2019-17571 CVE-2022-23305 CVE-2022-23307 CVE-2021-45105 CVE-2021-45046 CVE-2026-34477 CVE-2026-34479  +7 more Upstream summary: Apache Log4j2 2.0-beta9 through 2.15.0 (excluding security releases 2.12.2, 2.12.3, and 2.3.1) JNDI […]

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Common Problems 115967

Ubuntu 26.04 LTS – UFW blocks inbound service after rule reorder – Fix & Prevention

  • May 22, 2026
  • Linux
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🟠 High   ⏱ 5–30 min  Last verified: 19 May 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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CentOS Stream 9 — libsoup — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on CentOS Stream 9

CentOS Stream 9 — libsoup — multiple vulnerabilities (20 CVEs) — patch and remediation guide

  • May 22, 2026
  • Linux
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🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: CentOS Stream 9 📖 ~4 min read  •  Source: AlmaLinux/RHEL advisory ALSA-2026:2216 Related CVEs: CVE-2026-0719 CVE-2026-1761 CVE-2025-14523 CVE-2025-11021 CVE-2025-4945 CVE-2025-2784 CVE-2025-32049 CVE-2025-32914  +12 more Upstream summary: The libsoup packages provide an HTTP client and server library for GNOME. Security Fix(es): * libsoup: […]

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Common Problems 120026

Debian 12 DNS Resolution Flaps with systemd-resolved

  • May 22, 2026
  • Linux
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🟡 Medium   ⏱ 5–30 min  Last verified: 19 May 2026 Affected versions: Debian 12 📖 ~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 116961

Ubuntu 22.04 LTS – Cloud-init overwrites network config unexpectedly – Fix & Prevention

  • May 22, 2026
  • Linux
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🟡 Medium   ⏱ 5–30 min  Last verified: 19 May 2026 Affected versions: Ubuntu 22.04 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 118461

Ubuntu 16.04 LTS – /boot partition full blocks kernel upgrades – Fix & Prevention

  • May 22, 2026
  • Linux
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🟠 High   ⏱ 5–30 min  Last verified: 19 May 2026 Affected versions: Ubuntu 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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SLES 16 — python313-h11 — vulnerability — patch and remediation guide — diagnosis and fix on SLES 16

SLES 16 — python313-h11 — vulnerability — patch and remediation guide

  • May 22, 2026
  • Linux
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🔴 Critical   ⏱ 15–90 min  Last verified: 25 May 2026 Affected versions: SLES 16 📖 ~4 min read  •  Source: SUSE advisory SUSE-SU-2025:1430-1 (see also SUSE bugzilla) Related CVEs: CVE-2025-43859 Upstream summary: h11 is a Python implementation of HTTP/1.1. Prior to version 0.16.0, a leniency in h11's parsing of line terminators in chunked-coding message […]

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CentOS Stream 10 — ipa — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on CentOS Stream 10

CentOS Stream 10 — ipa — multiple vulnerabilities (2 CVEs) — patch and remediation guide

  • May 22, 2026
  • Linux
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🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: CentOS Stream 10 📖 ~4 min read  •  Source: AlmaLinux/RHEL advisory ALSA-2025:20994 Related CVEs: CVE-2025-7493 CVE-2025-4404 Upstream summary: AlmaLinux Identity Management (IdM) is a centralized authentication, identity management, and authorization solution for both traditional and cloud-based enterprise environments. Security Fix(es): * FreeIPA: […]

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Oracle Linux 9 — .NET 8.0 — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 9

Oracle Linux 9 — .NET 8.0 — vulnerability — patch and remediation guide (ELSA-2026-4454)

  • May 22, 2026
  • Linux
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🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Oracle Linux 9 📖 ~4 min read  •  Source: ELSA advisory ELSA-2026-4454 Related CVEs: CVE-2026-26130 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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SLES 15 — ghostscript — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on SLES 15

SLES 15 — ghostscript — multiple vulnerabilities (20 CVEs) — patch and remediation guide

  • May 22, 2026
  • Linux
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🔴 Critical   ⏱ 15–90 min  Last verified: 25 May 2026 Affected versions: SLES 15 📖 ~4 min read  •  Source: SUSE advisory SUSE-SU-2021:3044-1 (see also SUSE bugzilla) Related CVEs: CVE-2021-3781 CVE-2025-27832 CVE-2025-27835 CVE-2025-27836 CVE-2024-46951 CVE-2024-46953 CVE-2024-46956 CVE-2020-16305  +12 more Upstream summary: A trivial sandbox (enabled with the `-dSAFER` option) escape flaw was found in […]

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