CVE-2019-19922 : Vulnerability Insights and Analysis
Learn about CVE-2019-19922, a Linux kernel vulnerability allowing attackers to trigger slice expiration in Kubernetes, leading to denial-of-service attacks on non-CPU-bound applications. Find mitigation steps and updates here.
An issue was found in the Linux kernel version before 5.3.9 that can be exploited by attackers when using the parameter "cpu.cfs_quota_us," such as in Kubernetes, leading to a denial-of-service attack against non-CPU-bound applications.
Understanding CVE-2019-19922
What is CVE-2019-19922?
The vulnerability in the Linux kernel allows attackers to trigger unwanted slice expiration, potentially overloading the Kubernetes cluster and causing low-performance states without affecting kernel stability.
The Impact of CVE-2019-19922
Exploiting this flaw can result in the mismanagement of application execution, leading to denial-of-service attacks on non-CPU-bound applications.
Technical Details of CVE-2019-19922
Vulnerability Description
- Found in the Linux kernel before version 5.3.9
- Exploitable via the parameter "cpu.cfs_quota_us" in Kubernetes
- Allows attackers to trigger unwanted slice expiration
Affected Systems and Versions
- Linux kernel versions before 5.3.9
Exploitation Mechanism
- Attackers can calculate the number of stray requests to overload the Kubernetes cluster
- Results in a low-performance state due to slice expiration
Mitigation and Prevention
Immediate Steps to Take
- Update to Linux kernel version 5.3.9 or later
- Monitor and restrict resource usage in Kubernetes
Long-Term Security Practices
- Regularly update and patch the Linux kernel
- Implement proper resource allocation and monitoring in Kubernetes
Patching and Updates
- Apply patches provided by Linux kernel maintainers
- Stay informed about security advisories and updates from relevant sources