Common Problems

Debian 11 — ksmtp — multiple vulnerabilities (2 CVEs) — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — ksmtp — multiple vulnerabilities (2 CVEs) — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 9 February 2022 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2020-15954 CVE-2021-38373 Upstream summary: KDE KMail 19.12.3 (aka 5.13.3) engages in unencrypted POP3 communication during times when the UI indicates that encryption is in use. Table of contents […]

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Debian 11 — exfat-utils — vulnerability — patch and remediation guide — diagnosis and fix on Debian 11

Debian 11 — exfat-utils — vulnerability — patch and remediation guide

🟢 Low   ⏱ 5–15 min  Last verified: 9 February 2022 Affected versions: Debian 11 (bullseye) 📖 ~4 min read  •  Source: Debian Security Tracker Related CVEs: CVE-2015-8026 Upstream summary: Heap-based buffer overflow in the verify_vbr_checksum function in exfatfsck in exfat-utils before 1.2.1 allows remote attackers to cause a denial of service (infinite loop) or […]

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Ubuntu 16.04 — privoxy — multiple vulnerabilities (14 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

Ubuntu 16.04 — privoxy — multiple vulnerabilities (14 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 9 February 2022 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-4886-1 Related CVEs: CVE-2020-35502 CVE-2021-20209 CVE-2021-20210 CVE-2021-20211 CVE-2021-20212 CVE-2021-20213 CVE-2021-20214 CVE-2021-20215  +6 more Upstream summary: It was discovered that Privoxy incorrectly handled CGI requests. An attacker could possibly use this […]

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Ubuntu 16.04 — php-pear — multiple vulnerabilities (5 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

Ubuntu 16.04 — php-pear — multiple vulnerabilities (5 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 9 February 2022 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-5027-2 Related CVEs: CVE-2021-32610 CVE-2020-36193 CVE-2020-28948 CVE-2020-28949 CVE-2018-1000888 Upstream summary: USN-5027-1 fixed a vulnerability in PEAR. This update provides the corresponding update for Ubuntu 16.04 ESM. Original advisory details: It […]

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Ubuntu 16.04 — scilab — multiple vulnerabilities (4 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 16.04

Ubuntu 16.04 — scilab — multiple vulnerabilities (4 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 9 February 2022 Affected versions: Ubuntu 16.04 (xenial) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-5061-1 Related CVEs: CVE-2021-30485 CVE-2021-31229 CVE-2021-31347 CVE-2021-31598 Upstream summary: It was discovered that Scilab did not properly sanitize XML inputs. An atacker could use a crafted XML file to cause […]

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Amazon Linux 2 — nettle — vulnerability — patch and remediation guide — diagnosis and fix on Amazon Linux 2

Amazon Linux 2 — nettle — vulnerability — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Amazon Linux 2 📖 ~4 min read  •  Source: Amazon Linux advisory ALAS2-2021-1629 Related CVEs: CVE-2021-20305 Upstream summary: A flaw was found in Nettle, where several Nettle signature verification functions (GOST DSA, EDDSA & ECDSA) result in the Elliptic Curve Cryptography point […]

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Oracle Linux 8 — samba — security and stability fixes — required update — diagnosis and fix on Oracle Linux 8

Oracle Linux 8 — samba — security and stability fixes — required update (ELSA-2022-7111)

🟡 Medium   ⏱ 10–30 min  Last verified: 8 February 2022 Affected versions: Oracle Linux 8 📖 ~4 min read  •  Source: ELSA advisory ELSA-2022-7111 Related CVEs: CVE-2022-32742 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – Alternative Approaches Verification & Acceptance […]

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Common Problems 121634

Debian 9 – ext4 filesystem remounts read-only after I/O errors

🔴 Critical   ⏱ 5–30 min  Last verified: 8 February 2022 Affected versions: Debian 9 📖 ~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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AlmaLinux 8 — gegl04 — vulnerability — patch and remediation guide — diagnosis and fix on AlmaLinux 8

AlmaLinux 8 — gegl04 — vulnerability — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: AlmaLinux 8 📖 ~4 min read  •  Source: AlmaLinux ALSA ALSA-2022:0177 Related CVEs: CVE-2021-45463 Upstream summary: GEGL (Generic Graphics Library) is a graph-based image processing framework. Security Fix(es): * gegl: shell expansion via a crafted pathname (CVE-2021-45463) For more details about the […]

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