CVE-2019-19462 : Vulnerability Insights and Analysis
Learn about CVE-2019-19462, a Linux kernel vulnerability allowing local users to cause a denial of service by triggering a NULL result in the relay_open function.
In the Linux kernel through version 5.4.1, a vulnerability exists in the relay_open function that can be exploited by local users to cause a denial of service. This can lead to a blockage in relay functionality by triggering a NULL result when calling the alloc_percpu function.
Understanding CVE-2019-19462
This CVE identifies a vulnerability in the Linux kernel that allows local users to disrupt relay functionality, potentially leading to a denial of service.
What is CVE-2019-19462?
The vulnerability in the relay_open function in the Linux kernel through version 5.4.1 enables local users to intentionally cause a denial of service by triggering a NULL result when invoking the alloc_percpu function.
The Impact of CVE-2019-19462
The exploitation of this vulnerability can result in a blockage in relay functionality, leading to a denial of service condition within affected systems.
Technical Details of CVE-2019-19462
This section provides more in-depth technical insights into the CVE-2019-19462 vulnerability.
Vulnerability Description
The relay_open function in kernel/relay.c in the Linux kernel through 5.4.1 allows local users to cause a denial of service, such as relay blockage, by triggering a NULL alloc_percpu result.
Affected Systems and Versions
- Product: Not applicable
- Vendor: Not applicable
- Versions: All versions through Linux kernel 5.4.1
Exploitation Mechanism
The vulnerability can be exploited by local users to deliberately trigger a NULL result when calling the alloc_percpu function, leading to a denial of service.
Mitigation and Prevention
Protecting systems from CVE-2019-19462 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Apply relevant security patches provided by the Linux kernel maintainers.
- Monitor system logs for any unusual relay functionality behavior.
- Restrict access to vulnerable systems to trusted users only.
Long-Term Security Practices
- Regularly update and patch the Linux kernel to address known vulnerabilities.
- Implement the principle of least privilege to limit user access rights.
- Conduct regular security audits and vulnerability assessments.
Patching and Updates
Ensure timely installation of security updates and patches released by the Linux kernel maintainers to mitigate the CVE-2019-19462 vulnerability.