CVE-2019-19922

 

Published at: - 22-12-2019 09:15

Last modified: - 26-10-2022 01:44

Total changes: - 4

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.)

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

 

Verification logic

 

Reference

• https://relistan.com/the-kernel-may-be-slowing-down-your-app
• https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=de53fd7aedb100f03e5d2231cfce0e4993282425
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.3.9
• https://github.com/torvalds/linux/commit/de53fd7aedb100f03e5d2231cfce0e4993282425
• https://github.com/kubernetes/kubernetes/issues/67577
• USN-4226-1-Third Party Advisory
• [debian-lts-announce] 20200118 [SECURITY] [DLA 2068-1] linux security update-
• https://security.netapp.com/advisory/ntap-20200204-0002/
• https://www.oracle.com/security-alerts/cpuApr2021.html

 

Keywords

NVD

 

CVE-2019-19922

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures