Security Hardening

Common Problems 113979

RHEL 10 – firewalld port opens temporarily but closes after reboot – Fix & Prevention

🟡 Medium   ⏱ 5–30 min  Last verified: 30 April 2026 Affected versions: RHEL 10.0 RHEL 10.1 📖 ~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 […]

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Common Problems 115992

Ubuntu 26.04 LTS – SSH service fails to start after configuration change – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 30 April 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 115889

Ubuntu 26.04 LTS – apt lock prevents installs and updates – Fix & Prevention

🟠 High   ⏱ 5–30 min  Last verified: 30 April 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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Amazon Linux 2023 — openssh — multiple vulnerabilities (11 CVEs) — patch and remediation guide — diagnosis and fix on Amazon Linux 2023

Amazon Linux 2023 — openssh — multiple vulnerabilities (11 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Amazon Linux 2023 📖 ~4 min read  •  Source: Amazon Linux advisory ALAS2023-2026-1604 Related CVEs: CVE-2026-35385 CVE-2024-6387 CVE-2024-6409 CVE-2016-10009 CVE-2023-38408 CVE-2025-26465 CVE-2023-51385 CVE-2023-48795  +3 more Upstream summary: In OpenSSH before 10.3, a file downloaded by scp may be installed setuid or setgid, […]

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FreeBSD 15 — proxychains-ng — vulnerability — patch and remediation guide — diagnosis and fix on FreeBSD 15

FreeBSD 15 — proxychains-ng — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 30 April 2026 Affected versions: FreeBSD 15 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: proxychains-ng — current path as the first directory for the library search path Related CVEs: CVE-2015-3887 Upstream summary: Mamoru TASAKA reports: proxychains4 sets LD_PRELOAD to dlopen libproxychains4.so and execvp() the […]

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FreeBSD 15 — xtrlock — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on FreeBSD 15

FreeBSD 15 — xtrlock — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 30 April 2026 Affected versions: FreeBSD 15 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: xtrlock — xtrlock does not block multitouch events Related CVEs: CVE-2005-0079 CVE-2016-10894 Upstream summary: Debian reports: xtrlock did not block multitouch events so an attacker could still input and thus […]

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Amazon Linux 2023 — kernel-livepatch-6.18.25-52.107 — vulnerability — patch and remediation guide — diagnosis and fix on Amazon Linux 2023

Amazon Linux 2023 — kernel-livepatch-6.18.25-52.107 — vulnerability — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Amazon Linux 2023 📖 ~4 min read  •  Source: Amazon Linux advisory ALAS2023LIVEPATCH-2026-135 Related CVEs: CVE-2026-43284 Upstream summary: In the Linux kernel, the following vulnerability has been resolved: xfrm: esp: avoid in-place decrypt on shared skb frags "Dirty Frag" and other issues […]

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AlmaLinux 9 — libvpx — multiple vulnerabilities (5 CVEs) — patch and remediation guide — diagnosis and fix on AlmaLinux 9

AlmaLinux 9 — libvpx — multiple vulnerabilities (5 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: AlmaLinux 9 📖 ~4 min read  •  Source: AlmaLinux ALSA ALSA-2026:4447 Related CVEs: CVE-2026-2447 CVE-2025-5283 CVE-2023-44488 CVE-2023-5217 CVE-2024-5197 Upstream summary: The libvpx packages provide the VP8 SDK, which allows the encoding and decoding of the VP8 video codec, commonly used with the […]

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FreeBSD 15 — ja-ppxp — vulnerability — patch and remediation guide — diagnosis and fix on FreeBSD 15

FreeBSD 15 — ja-ppxp — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 30 April 2026 Affected versions: FreeBSD 15 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: ppxp — local root exploit Related CVEs: CVE-2005-0392 Upstream summary: A Debian Advisory reports: Jens Steube discovered that ppxp, yet another PPP program, does not release root privileges when opening […]

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FreeBSD 15 — linux-f10-expat — vulnerability — patch and remediation guide — diagnosis and fix on FreeBSD 15

FreeBSD 15 — linux-f10-expat — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 30 April 2026 Affected versions: FreeBSD 15 📖 ~4 min read  •  Source: FreeBSD VuXML VuXML topic: expat2 — Parser crash with specially formatted UTF-8 sequences Related CVEs: CVE-2009-3720 Upstream summary: CVE reports: The updatePosition function in lib/xmltok_impl.c in libexpat in Expat 2.0.1, as used in Python, […]

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