CVE-2021-3635: Fedoraproject Fedora

Medium severity, CVSS 4.4. EPSS: 0.2% chance of exploitation in the next 30 days.

A flaw was found in the Linux kernel netfilter implementation in versions prior to 5.5-rc7. A user with root (CAP_SYS_ADMIN) access is able to panic the system when issuing netfilter netflow commands.

Affected products

• Fedoraproject Fedora: version 34 only
• Linux Linux Kernel: before 5.5 (fixed in 5.5); version 5.5 only
• Red Hat Enterprise Linux: version 6.0 only; version 7.0 only; version 8.0 only

Published 2021-08-13. Last modified 2026-06-17.