CVE-2019-19922 Denial of service in n/a

What is CVE-2019-19922?

CVE-2019-19922 is a medium-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 22 Dec 2019. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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.)

Weakness: CWE-400

Which versions are affected by CVE-2019-19922?

It affects 14 products.

Products include Canonical Ubuntu Linux, Debian Debian Linux, Linux kernel, Netapp Active Iq Unified Manager, Netapp Aff Baseboard Management Controller, Netapp Cloud Backup and 8 more.

How do I fix CVE-2019-19922?

Upgrade to a fixed version.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2019-19922 being exploited?

There is no known exploitation of CVE-2019-19922 in the wild and no public exploit code.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2019-19922, GHSA-q3fc-6x2v-6ph8, UBUNTU-CVE-2019-19922.