Linux

Ubuntu 22.04 — netplan.io — multiple vulnerabilities (5 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 22.04

Ubuntu 22.04 — netplan.io — multiple vulnerabilities (5 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 20 June 2023 Affected versions: Ubuntu 22.04 (jammy) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-6851-2 Related CVEs: https://launchpad.net/bugs/2071333 CVE-2022-4968 https://launchpad.net/bugs/2066258 https://launchpad.net/bugs/1987842 https://launchpad.net/bugs/2065738 Upstream summary: USN-6851-1 fixed vulnerabilities in Netplan. The update lead to the discovery of a regression in netplan which caused systemctl enable […]

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Alpine Linux 3.18 — gmp — vulnerability — patch and remediation guide — diagnosis and fix on Alpine Linux 3.18

Alpine Linux 3.18 — gmp — vulnerability — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 25 May 2026 Affected versions: Alpine Linux 3.18 / fixed in 6.2.1-r1 📖 ~4 min read  •  Source: Alpine secdb entry — gmp 6.2.1-r1 Related CVEs: CVE-2021-43618 Upstream summary: Alpine main repository for vv3.18 ships gmp 6.2.1-r1 which addresses CVE-2021-43618. Table of contents Symptom & Impact Environment […]

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Ubuntu 20.04 — edk2 — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 20.04

Ubuntu 20.04 — edk2 — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 20 June 2023 Affected versions: Ubuntu 20.04 (focal) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-7060-1 Related CVEs: CVE-2019-0161 CVE-2021-28210 CVE-2021-28211 CVE-2021-38575 CVE-2021-38578 CVE-2022-1292 CVE-2022-36763 CVE-2022-36764  +12 more Upstream summary: It was discovered that EDK II did not check the buffer length in XHCI, which […]

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Ubuntu 18.04 — barbican — multiple vulnerabilities (3 CVEs) — patch and remediation guide — diagnosis and fix on Ubuntu 18.04

Ubuntu 18.04 — barbican — multiple vulnerabilities (3 CVEs) — patch and remediation guide

🟡 Medium   ⏱ 10–30 min  Last verified: 20 June 2023 Affected versions: Ubuntu 18.04 (bionic) 📖 ~4 min read  •  Source: Ubuntu Security Notice USN-5697-1 Related CVEs: CVE-2022-3100 CVE-2022-23451 CVE-2022-23452 Upstream summary: Douglas Mendizabal discovered that Barbican incorrectly handled certain query strings. A remote attacker could possibly use this issue to bypass the access […]

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Oracle Linux 9 — thunderbird — vulnerability — patch and remediation guide — diagnosis and fix on Oracle Linux 9

Oracle Linux 9 — thunderbird — vulnerability — patch and remediation guide (ELSA-2023-0824)

🟠 High   ⏱ 15–60 min  Last verified: 20 June 2023 Affected versions: Oracle Linux 9 📖 ~4 min read  •  Source: ELSA advisory ELSA-2023-0824 Related CVEs: CVE-2023-25732 CVE-2023-25728 CVE-2023-25737 CVE-2023-25742 CVE-2023-25743 CVE-2023-25739 Table of contents Symptom & Impact Environment & Reproduction Root Cause Analysis Quick Triage Step-by-Step Diagnosis Solution – Primary Fix Solution – […]

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openSUSE Leap 15.5 — libwebp7 — vulnerability — patch and remediation guide — diagnosis and fix on openSUSE Leap 15.5

openSUSE Leap 15.5 — libwebp7 — vulnerability — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: openSUSE Leap 15.5 📖 ~4 min read  •  Source: SUSE advisory SUSE-SU-2023:2064-1 (see also SUSE bugzilla) Related CVEs: CVE-2023-1999 Upstream summary: There exists a use after free/double free in libwebp. An attacker can use the ApplyFiltersAndEncode() function and loop through to free […]

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Common Problems 120183

Debian 12 – Certbot Renewal Fails in Automation – Reliable ACME Recovery

🟠 High   ⏱ 5–30 min  Last verified: 20 June 2023 Affected versions: Debian 12 📖 ~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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Alpine Linux 3.18 — go — multiple vulnerabilities (20 CVEs) — patch and remediation guide — diagnosis and fix on Alpine Linux 3.18

Alpine Linux 3.18 — go — multiple vulnerabilities (20 CVEs) — patch and remediation guide

🟠 High   ⏱ 15–60 min  Last verified: 25 May 2026 Affected versions: Alpine Linux 3.18 / fixed in 1.9.4-r0 📖 ~4 min read  •  Source: Alpine secdb entry — go 1.9.4-r0 Related CVEs: CVE-2018-6574 CVE-2023-39323 CVE-2023-39318 CVE-2023-39319 CVE-2023-39321 CVE-2023-39322 CVE-2023-29406 CVE-2023-29409  +12 more Upstream summary: Alpine community repository for vv3.18 ships go 1.9.4-r0 which […]

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Oracle Linux 9 — krb5 security, bug fix, and — enhancement update — new behaviour and fixes — diagnosis and fix on Oracle Linux 9

Oracle Linux 9 — krb5 security, bug fix, and — enhancement update — new behaviour and fixes (ELSA-2023-2570)

🟡 Medium   ⏱ 10–30 min  Last verified: 19 June 2023 Affected versions: Oracle Linux 9 📖 ~4 min read  •  Source: ELSA advisory ELSA-2023-2570 Related CVEs: CVE-2020-17049 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 121584

Debian 9 – UFW policy blocks package downloads and outbound HTTPS

🟡 Medium   ⏱ 5–30 min  Last verified: 19 June 2023 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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