lwIP vulnerabilities

Summary

It was discovered that lwIP contained a buffer overflow in the EAP authentication handling code. An attacker could possibly use this issue to trigger a buffer overflow, resulting in arbitrary code execution or a denial of service. This issue only affected Ubuntu 20.04 LTS. (CVE-2020-8597) It was discovered that lwIP incorrectly handled certain ICMPv6 or 6LoWPAN packets. An attacker could possibly use this issue to trigger a buffer overflow, resulting in information disclosure. This issue only affected Ubuntu 20.04 LTS. (CVE-2020-22283, CVE-2020-22284) It was discovered that lwIP did not properly validate certain SNMPv3 authentication parameters. An attacker could possibly use this issue to trigger a stack-based buffer overflow, resulting in arbitrary code execution or a denial of service. (CVE-2026-8836) Affected Ubuntu releases: 26.04, 24.04, 22.04, 20.04. CVEs: CVE-2026-8836, CVE-2020-22284, CVE-2020-22283, CVE-2020-8597.