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CVE-2019-19922

5.5 · MEDIUM

kernel/sched/fair.c in the Linux kernel before 5.3.9, when cpu.cfs_quota_us is used (e.g., with Kubernetes), allows attackers to cause a denial of service against non-cpu-bound applications by gene…

Published Dec 22, 2019CWE-400EPSS 0.95%

Overview

CVE-2019-19922 is a medium-severity vulnerability. It was published on December 22, 2019 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

kernel/sched/fair.c in the Linux kernel before 5.3.9, when cpu.cfs_quota_us is used (e.g., with Kubernetes), allows attackers to cause a denial of service against non-cpu-bound applications by generating a workload that triggers unwanted slice expiration, aka CID-de53fd7aedb1. (In other words, although this slice expiration would typically be seen with benign workloads, it is possible that an attacker could calculate how many stray requests are required to force an entire Kubernetes cluster into a low-performance state caused by slice expiration, and ensure that a DDoS attack sent that number of stray requests. An attack does not affect the stability of the kernel; it only causes mismanagement of application execution.)

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refcdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.3.9Refgit.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=de53fd7aedb100f03e5d2231cfce0e4993282425GitHubgithub.com/kubernetes/kubernetes/issues/67577GitHubgithub.com/torvalds/linux/commit/de53fd7aedb100f03e5d2231cfce0e4993282425Reflists.debian.org/debian-lts-announce/2020/01/msg00013.htmlRefrelistan.com/the-kernel-may-be-slowing-down-your-appRefsecurity.netapp.com/advisory/ntap-20200204-0002/Refusn.ubuntu.com/4226-1/Refwww.oracle.com/security-alerts/cpuApr2021.htmlRefcdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.3.9

How CyberStrike helps

Frequently asked questions

What is CVE-2019-19922?

CVE-2019-19922 is a medium-severity vulnerability. It was published on December 22, 2019 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2019-19922?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2019-19922?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2019-19922?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-19922 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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