Kernel Drivers

Oracle Linux 8 — Unbreakable Enterprise kernel-container — vulnerability — patch and remediation guide (ELSA-2021-9038)

• June 2, 2021
• Linux
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🟠 High   ⏱ 15–60 min  Last verified: 2 June 2021 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2021-9038 Related CVEs: CVE-2020-28374 CVE-2021-20177 CVE-2020-29568 CVE-2020-29660 CVE-2020-36158 CVE-2020-29569 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – […]

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How to Configure Kubernetes Persistent Volumes on FreeBSD 13

• June 1, 2021
• FreeBSD
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Introduction How to Configure Kubernetes Persistent Volumes on FreeBSD 13 is a core administration task for any FreeBSD 13 server operator. FreeBSD 13 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 […]

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Ubuntu 14.04 LTS GRUB Rescue Prompt After Bootloader Changes

• May 31, 2021
• Linux
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🟡 Medium   ⏱ 5–30 min  Last verified: 31 May 2021 📖 ~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 & Cross-Refs References & Further […]

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How to Configure Shared Memory Segments on IBM AIX 7.2

• May 31, 2021
• IBM AIX
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Introduction IBM AIX 7.2 is the latest release of IBM’s enterprise-grade UNIX operating system, running on IBM Power Systems hardware. Known for its reliability, security, and performance in mission-critical environments, AIX 7.2 introduces enhanced virtualization, security hardening, and cloud integration features. This guide covers how to configure shared memory segments on ibm aix 7.2 on […]

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Ubuntu 20.04 Black Screen After Login With NVIDIA

• May 30, 2021
• Linux
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🟡 Medium   ⏱ 5–30 min  Last verified: 30 May 2021 📖 ~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 & Cross-Refs References & Further […]

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How to Manage Users and Groups on FreeBSD 13

• May 29, 2021
• FreeBSD
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Introduction How to Manage Users and Groups on FreeBSD 13 is a core administration task for any FreeBSD 13 server operator. FreeBSD 13 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 […]

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Ubuntu 20.04 Suspend and Resume Failures

• May 29, 2021
• Linux
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🟡 Medium   ⏱ 5–30 min  Last verified: 29 May 2021 📖 ~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 & Cross-Refs References & Further […]

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RHEL 7 auditd Backlog Limit Reached

• May 28, 2021
• Linux
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🟠 High   ⏱ 5–30 min  Last verified: 28 May 2021 Affected versions: RHEL 7 📖 ~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 Harden the Linux Kernel with sysctl on RHEL 7

• May 28, 2021
• Linux
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How to Harden the Linux Kernel with sysctl on RHEL 7 The Linux kernel exposes hundreds of tunable parameters through the /proc/sys/ virtual filesystem, and the sysctl utility provides a clean interface for reading and setting those values at runtime and persistently across reboots. Many of these parameters have direct security implications: they control whether […]

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Amazon Linux 2 — kernel-livepatch-4.14.225-169.362 — vulnerability — patch and remediation guide

• May 28, 2021
• 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-2021-051 Related CVEs: CVE-2021-33034 Upstream summary: A use-after-free flaw was found in hci_send_acl in the bluetooth host controller interface (HCI) in Linux kernel, where a local attacker with an access […]

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