Linux

AlmaLinux 8 — pptp — vulnerability — patch and remediation guide — diagnosis and fix on AlmaLinux 8

AlmaLinux 8 — pptp — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: AlmaLinux 8 📖 ~4 min read  •  Source: AlmaLinux ALSA ALBA-2020:4679 Upstream summary: For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section. Table of contents Symptom & Impact Environment & Reproduction Root Cause […]

Read more
Common Problems 119158

Ubuntu 14.04 LTS fail2ban stops banning malicious IPs after log format change

🟡 Medium   ⏱ 5–30 min  Last verified: 6 September 2021 Affected versions: 14.04 📖 ~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 […]

Read more
Debian 11 — hamlib — vulnerability — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — hamlib — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 6 September 2021 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2009-3736 Upstream summary: ltdl.c in libltdl in GNU Libtool 1.5.x, and 2.2.6 before 2.2.6b, as used in Ham Radio Control Libraries, Q, and possibly other products, attempts to […]

Read more
Common Problems 118546

Ubuntu 16.04 LTS – OOM killer terminates critical services

🔴 Critical   ⏱ 5–30 min  Last verified: 6 September 2021 Affected versions: Ubuntu 16.04 LTS Ubuntu 16.04 Ubuntu 16.04.7 📖 ~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 […]

Read more
Debian 11 — sketch — vulnerability — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — sketch — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 6 September 2021 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2002-2047 Upstream summary: The file preview functionality in Sketch 0.6.12 and earlier allows remote attackers to execute arbitrary commands via shell metacharacters in the filename of an encapsulated […]

Read more
Debian 11 — r-cran-readxl — multiple vulnerabilities (16 CVEs) — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — r-cran-readxl — multiple vulnerabilities (16 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 6 September 2021 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2017-12108 CVE-2017-12109 CVE-2017-12110 CVE-2017-12111 CVE-2017-2896 CVE-2017-2897 CVE-2017-2919 CVE-2018-20450  +8 more Upstream summary: An exploitable integer overflow vulnerability exists in the xls_preparseWorkSheet function of libxls 1.4 when handling a […]

Read more
AlmaLinux 8 — libhugetlbfs — vulnerability — patch and remediation guide — diagnosis and fix on AlmaLinux 8

AlmaLinux 8 — libhugetlbfs — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: AlmaLinux 8 📖 ~4 min read  •  Source: AlmaLinux ALSA ALBA-2020:4452 Upstream summary: For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section. Table of contents Symptom & Impact Environment & Reproduction Root Cause […]

Read more
How To Use PAM to Configure Authentication on an Ubuntu 12.04 VPS — step-by-step Linux tutorial on Progressive Robot

How To Use PAM to Configure Authentication on an Ubuntu 12.04 VPS

PAM, or Pluggable Authentication Modules, is a system for connecting authentication services to application requesting authentication, through the use of a consistent API. Authentication schemes can be switched out without having to reconfigure large amounts of code. In this guide, we will discuss how PAM works and give a basic explanation of how the system operates.

Read more
How to Set Up a Local Container Registry with Harbor on RHEL 8 — step-by-step RHEL 8 tutorial on Progressive Robot

How to Set Up a Local Container Registry with Harbor on RHEL 8

Harbor is an enterprise-grade, open-source container registry that extends the base OCI registry specification with role-based access control, project isolation, image vulnerability scanning powered by Trivy, and cross-datacenter image replication. Running your own Harbor instance on RHEL 8 gives your team a private, auditable registry with no bandwidth costs or rate-limiting imposed by Docker Hub. […]

Read more
Ubuntu 18.04 — policykit-1 — multiple vulnerabilities (7 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 18.04

Ubuntu 18.04 — policykit-1 — multiple vulnerabilities (7 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 6 September 2021 Affected versions: Ubuntu 18.04 (bionic) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-5252-1 Related CVEs: CVE-2021-4034 CVE-2019-6133 CVE-2018-19788 CVE-2015-3218 CVE-2015-3255 CVE-2015-4625 CVE-2018-1116 Upstream summary: It was discovered that the PolicyKit pkexec tool incorrectly handled command-line arguments. A local attacker could use this […]

Read more
CHAT