Security Hardening

Alpine Linux edge — dotnet9-runtime — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on Alpine Linux edge

Alpine Linux edge — dotnet9-runtime — multiple vulnerabilities (20 CVEs) — patch and remediation guide

  • June 8, 2026
  • Linux
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🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Alpine Linux edge / fixed in 9.0.6-r0 📖 ~4 min read  •  Source: Alpine secdb entry — dotnet9-runtime 9.0.6-r0 Related CVEs: CVE-2025-30399 CVE-2025-26646 CVE-2025-26682 CVE-2025-24070 CVE-2026-32177 CVE-2026-35433 CVE-2026-32175 CVE-2026-42899  +12 more Upstream summary: Alpine community repository for vedge ships dotnet9-runtime 9.0.6-r0 which […]

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Debian 13 — pykerberos — vulnerability — patch and remediation guide — diagnosis and fix on Debian 13

Debian 13 — pykerberos — vulnerability — patch and remediation guide

  • June 8, 2026
  • Linux
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🟢 Low   ⏱ 5–15 min  Last verified: 8 June 2026 Affected versions: Debian 13 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2015-3206 Upstream summary: The checkPassword function in python-kerberos does not authenticate the KDC it attempts to communicate with, which allows remote attackers to cause a denial of service (bad […]

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Windows Server 2022 — KB5070881 — security update — patch and remediation guide — diagnosis and fix on Windows Server 2022

Windows Server 2022 — KB5070881 — security update — patch and remediation guide

🔴 Critical   ⏱ 15–90 min  Last verified: 25 May 2026 Affected versions: Windows Server 2022 📖 ~4 min read  •  Source: Microsoft KB5070881 • MSRC update-guide entry Related CVEs: CVE-2025-59287 Affected components: Windows Server 2022, 23H2 Edition (Server Core installation) Microsoft summary: Deserialization of untrusted data in Windows Server Update Service allows an unauthorized […]

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Debian 13 — prosody — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on Debian 13

Debian 13 — prosody — multiple vulnerabilities (20 CVEs) — patch and remediation guide

  • June 8, 2026
  • Linux
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🟠 High   ⏱ 15–60 min  Last verified: 8 June 2026 Affected versions: Debian 13 (trixie) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2011-2205 CVE-2011-2531 CVE-2011-2532 CVE-2014-2744 CVE-2014-2745 CVE-2016-0756 CVE-2016-1231 CVE-2016-1232  +12 more Upstream summary: Prosody before 0.8.1 does not properly detect recursion during entity expansion, which allows remote attackers to […]

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Debian 13 — amavisd-new — vulnerability — patch and remediation guide — diagnosis and fix on Debian 13

Debian 13 — amavisd-new — vulnerability — patch and remediation guide

  • June 8, 2026
  • Linux
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🟢 Low   ⏱ 5–15 min  Last verified: 8 June 2026 Affected versions: Debian 13 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2024-28054 Upstream summary: Amavis before 2.12.3 and 2.13.x before 2.13.1, in part because of its use of MIME-tools, has an Interpretation Conflict (relative to some mail user agents) when […]

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How to Set Up Two-Factor Authentication (2FA) for SSH on Ubuntu 26.04 — step-by-step Linux tutorial on Progressive Robot

How to Detect Rootkits with rkhunter on Ubuntu 26.04

  • June 8, 2026
  • Linux
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rkhunter (Rootkit Hunter) is a security tool that scans for rootkits, backdoors, and local exploits on Linux systems. It checks for known malware, suspicious file attributes, hidden files, and unusual system configurations. This guide installs and configures rkhunter on Ubuntu 26.04 LTS. Tested and valid on: Ubuntu 26.04 LTS Prerequisites Ubuntu 26.04 LTS A user […]

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Debian 13 — py-lmdb — multiple vulnerabilities (5 CVEs) — patch and remediation guide — diagnosis and fix on Debian 13

Debian 13 — py-lmdb — multiple vulnerabilities (5 CVEs) — patch and remediation guide

  • June 8, 2026
  • Linux
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🟡 Medium   ⏱ 10–30 min  Last verified: 8 June 2026 Affected versions: Debian 13 (trixie) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2019-16224 CVE-2019-16225 CVE-2019-16226 CVE-2019-16227 CVE-2019-16228 Upstream summary: An issue was discovered in py-lmdb 0.97. For certain values of md_flags, mdb_node_add does not properly set up a memcpy destination, […]

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Common Problems 116019

Ubuntu 26.04 LTS – GNOME Shell memory usage grows continuously

  • June 8, 2026
  • Linux
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🟡 Medium   ⏱ 5–30 min  Last verified: 8 June 2026 Affected versions: Ubuntu 26.04 LTS Ubuntu 26.04 Ubuntu 26.04.1 📖 ~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 […]

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Windows Server 2022 — KB5083769 — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on Windows Server 2022

Windows Server 2022 — KB5083769 — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🔴 Critical   ⏱ 15–90 min  Last verified: 25 May 2026 Affected versions: Windows Server 2022 📖 ~4 min read  •  Source: Microsoft KB5083769 • MSRC update-guide entry Related CVEs: CVE-2026-32157 CVE-2026-33827 CVE-2026-33824 CVE-2026-20930 CVE-2026-25250 CVE-2026-25184 CVE-2026-23670 CVE-2026-26151  +12 more Affected components: Windows Server 2022 Windows Server 2022, 23H2 Edition (Server Core installation) Microsoft summary: […]

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Debian 13 — node-ansi-up — vulnerability — patch and remediation guide — diagnosis and fix on Debian 13

Debian 13 — node-ansi-up — vulnerability — patch and remediation guide

  • June 8, 2026
  • Linux
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🟢 Low   ⏱ 5–15 min  Last verified: 8 June 2026 Affected versions: Debian 13 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2021-3377 Upstream summary: The npm package ansi_up converts ANSI escape codes into HTML. In ansi_up v4, ANSI escape codes can be used to create HTML hyperlinks. Due to insufficient […]

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