CVE-2021-20239: Fedoraproject Fedora

Low severity, CVSS 3.3. EPSS: 0.3% chance of exploitation in the next 30 days.

A flaw was found in the Linux kernel in versions before 5.4.92 in the BPF protocol. This flaw allows an attacker with a local account to leak information about kernel internal addresses. The highest threat from this vulnerability is to confidentiality.

Affected products

• Fedoraproject Fedora: version 33 only
• Linux Linux Kernel: before 5.4.92 (fixed in 5.4.92)
• Red Hat Enterprise Linux: version 5.0 only; version 6.0 only; version 8.0 only

Published 2021-05-28. Last modified 2026-06-17.