CVE-2021-3679: Debian Linux

Medium severity, CVSS 5.5. EPSS: 0.8% chance of exploitation in the next 30 days.

A lack of CPU resource in the Linux kernel tracing module functionality in versions prior to 5.14-rc3 was found in the way user uses trace ring buffer in a specific way. Only privileged local users (with CAP_SYS_ADMIN capability) could use this flaw to starve the resources causing denial of service.

Affected products

• Debian Debian Linux: version 9.0 only; version 10.0 only
• Linux Linux Kernel: before 5.14 (fixed in 5.14); version 5.14 only
• Red Hat Enterprise Linux: version 8.0 only

Published 2021-08-05. Last modified 2026-06-17.