CVE-2021-3679
MEDIUMLinux Kernel < 5.14 - Authenticated Denial of Service via Trace Ring Buffer Resource Starvation
Title source: llmExploitation Summary
EIP tracks 1 public exploit for CVE-2021-3679. PoCs published by aegistudio.
AI-analyzed exploit summary This repository contains a functional proof-of-concept exploit for CVE-2021-3679, which triggers a logic bug in `rb_per_cpu_empty` leading to a kernel-space deadloop. The exploit demonstrates a denial-of-service (DoS) condition by spawning a `dd` process that consumes a CPU core and cannot be terminated by standard UNIX signals.
Description
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.
Exploits (1)
This repository contains a functional proof-of-concept exploit for CVE-2021-3679, which triggers a logic bug in `rb_per_cpu_empty` leading to a kernel-space deadloop. The exploit demonstrates a denial-of-service (DoS) condition by spawning a `dd` process that consumes a CPU core and cannot be terminated by standard UNIX signals.
References (5)
Scores
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H