Amazon Linux 2 — kernel-livepatch-5.10.233-223.887 — multiple vulnerabilities (8 CVEs) — patch and remediation guide

July 7, 2026
Linux
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🟠 High ⏱ 15–60 min Last verified: 25 May 2026 Affected versions: Amazon Linux 2 📖 ~4 min read • Source: Amazon Linux advisory ALAS2LIVEPATCH-2025-216 Related CVEs: CVE-2025-21796 CVE-2025-21647 CVE-2025-21702 CVE-2024-56631 CVE-2023-52760 CVE-2024-36899 CVE-2024-49960 CVE-2024-50143 Upstream summary: In the Linux kernel, the following vulnerability has been resolved: nfsd: clear acl_access/acl_default after releasing them (CVE-2025-21796) […]

How to Configure SSH with FIDO2 Hardware Keys on RHEL 10

July 7, 2026
Linux
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Introduction RHEL 10 ships with a stable, security-hardened base that makes deploying configure ssh with fido2 hardware keys both straightforward and auditable. This tutorial covers the complete procedure for how to Configure SSH with FIDO2 Hardware Keys on RHEL 10, including dnf module streams where applicable, systemd unit management, and the firewalld rules required for […]

Oracle Linux 9 — Unbreakable Enterprise kernel — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 9

Oracle Linux 9 — Unbreakable Enterprise kernel — vulnerability — patch and remediation guide (ELSA-2026-50060)

July 7, 2026
Linux
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🟠 High ⏱ 15–60 min Last verified: 7 July 2026 Affected versions: Oracle Linux 9 📖 ~4 min read • Source: ELSA advisory ELSA-2026-50060 Related CVEs: CVE-2025-40248 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance […]

SELinux blocks NGINX upstream proxy connections

July 5, 2026
Tutorials
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🟠 High ⏱ 5–30 min Last verified: 5 July 2026 Affected versions: RHEL 10.0 RHEL 10.1 📖 ~1 min read Table of contents Problem Summary Symptoms Diagnostics Root Cause Primary Fix Verification Prevention Rollback Automation Command Reference Escalation Related Notes Problem Summary NGINX returns 502 because SELinux denies outbound proxy connection. Symptoms audit logs […]

Ubuntu 26.04 LTS – Secure Boot blocks unsigned DKMS kernel module load – Fix & Prevention

July 5, 2026
Linux
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🟠 High ⏱ 5–30 min Last verified: 5 July 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 […]

Amazon Linux 2 — kernel-livepatch-4.14.355-276.618 — multiple vulnerabilities (10 CVEs) — patch and remediation guide

July 5, 2026
Linux
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🟠 High ⏱ 15–60 min Last verified: 25 May 2026 Affected versions: Amazon Linux 2 📖 ~4 min read • Source: Amazon Linux advisory ALAS2LIVEPATCH-2025-242 Related CVEs: CVE-2023-53137 CVE-2025-21811 CVE-2025-21858 CVE-2025-21920 CVE-2024-47757 CVE-2024-49882 CVE-2024-50036 CVE-2024-50264 +2 more Upstream summary: In the Linux kernel, the following vulnerability has been resolved: ext4: Fix possible corruption when […]

Oracle Linux 9 — Unbreakable Enterprise kernel — vulnerability — patch and remediation guide (ELSA-2025-25754)

July 5, 2026
Linux
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🟠 High ⏱ 15–60 min Last verified: 5 July 2026 Affected versions: Oracle Linux 9 📖 ~4 min read • Source: ELSA advisory ELSA-2025-25754 Related CVEs: CVE-2025-22103 CVE-2025-22106 CVE-2025-22113 CVE-2025-22124 CVE-2025-23133 CVE-2025-38272 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – […]

How to Configure OSPF with FRRouting on FreeBSD 15

July 4, 2026
FreeBSD
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Introduction How to Configure OSPF with FRRouting on FreeBSD 15 is a core administration task for any FreeBSD 15 server operator. FreeBSD 15 ships with the 15.0-RELEASE kernel, ZFS as the default root filesystem, Capsicum capability sandboxing improvements, and an updated ports tree. Unlike Linux distributions, FreeBSD uses rc(8) for service management, pf for packet […]

Ubuntu 26.04 LTS – AppArmor profile denies custom service file access – Fix & Prevention

July 4, 2026
Linux
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🟡 Medium ⏱ 5–30 min Last verified: 4 July 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 […]

How to Install ClickHouse on RHEL 10

July 4, 2026
Linux
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Introduction How to Install ClickHouse on RHEL 10 on RHEL 10 provides administrators with a robust, enterprise-ready workflow that integrates cleanly with systemd, SELinux, firewalld, and the modern AppStream module system. In this tutorial we will walk through every step required, from package installation to verification, so that the resulting configuration is reproducible and production-safe. […]

Kernel Drivers

Amazon Linux 2 — kernel-livepatch-5.10.233-223.887 — multiple vulnerabilities (8 CVEs) — patch and remediation guide

How to Configure SSH with FIDO2 Hardware Keys on RHEL 10

Oracle Linux 9 — Unbreakable Enterprise kernel — vulnerability — patch and remediation guide (ELSA-2026-50060)

SELinux blocks NGINX upstream proxy connections

Ubuntu 26.04 LTS – Secure Boot blocks unsigned DKMS kernel module load – Fix & Prevention

Amazon Linux 2 — kernel-livepatch-4.14.355-276.618 — multiple vulnerabilities (10 CVEs) — patch and remediation guide

Oracle Linux 9 — Unbreakable Enterprise kernel — vulnerability — patch and remediation guide (ELSA-2025-25754)

How to Configure OSPF with FRRouting on FreeBSD 15

Ubuntu 26.04 LTS – AppArmor profile denies custom service file access – Fix & Prevention

How to Install ClickHouse on RHEL 10

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