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Vulnerability · Published Aug 5, 2021 · Assigned by redhat

CVE-2021-3679

Medium 5.5

In plain English

A medium-severity uncontrolled resource consumption in kernel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 55% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)5.5Medium
Exploit odds (30 days)0.8%top 44.8% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack tooling1Public PoC

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8kernel-tools-libs-devel4.18.0-348.el8ALSA-2021:4356
Debian:12linux5.14.6-1DEBIAN-CVE-2021-3679
Debian:13linux5.14.6-1DEBIAN-CVE-2021-3679
Debian:14linux5.14.6-1DEBIAN-CVE-2021-3679
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2021-3679
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2021-3679
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2021-3679

Affected products (as reported)

VendorProductVersions
n/a kernel kernel 5.14-rc3

Weakness: CWE-400

References