CVE-2019-11815 : What You Need to Know

A problem was identified in the Linux kernel before version 5.0.8, specifically in rds_tcp_kill_sock found in net/rds/tcp.c. This issue involves a race condition leading to a use-after-free situation related to the cleanup of the net namespace.

Understanding CVE-2019-11815

What is CVE-2019-11815?

CVE-2019-11815 is a vulnerability in the Linux kernel before version 5.0.8, specifically in the rds_tcp_kill_sock function in net/rds/tcp.c. It involves a race condition that results in a use-after-free scenario.

The Impact of CVE-2019-11815

This vulnerability could be exploited by an attacker to execute arbitrary code or cause a denial of service (DoS) on affected systems. It poses a risk to the integrity and availability of the Linux kernel.

Technical Details of CVE-2019-11815

Vulnerability Description

The issue lies in the rds_tcp_kill_sock function in net/rds/tcp.c in the Linux kernel before version 5.0.8. A race condition occurs, leading to a use-after-free situation during net namespace cleanup.

Affected Systems and Versions

Linux kernel versions before 5.0.8 are affected by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by triggering the race condition in the rds_tcp_kill_sock function, potentially leading to unauthorized code execution or DoS attacks.

Mitigation and Prevention

Immediate Steps to Take

Apply the latest security patches provided by the Linux kernel maintainers.
Monitor official sources for updates and advisories related to this vulnerability.

Long-Term Security Practices

Regularly update the Linux kernel to the latest stable version to mitigate known vulnerabilities.
Implement network segmentation and access controls to reduce the attack surface.

Patching and Updates

Ensure timely installation of security updates and patches released by the Linux kernel development team to address CVE-2019-11815.