CVE-2019-20811 Explained : Impact and Mitigation

A problem was identified in the Linux kernel prior to version 5.0.6. The issue is related to improper handling of a reference count in specific functions.

Understanding CVE-2019-20811

This CVE involves mishandling a reference count in the Linux kernel, specifically in the functions rx_queue_add_kobject() and netdev_queue_add_kobject() found in net/core/net-sysfs.c.

What is CVE-2019-20811?

CVE-2019-20811 is a vulnerability in the Linux kernel that affects versions before 5.0.6. It is also known as CID-a3e23f719f5c.

The Impact of CVE-2019-20811

The mishandling of the reference count in the mentioned functions can potentially lead to security vulnerabilities, allowing attackers to exploit the system.

Technical Details of CVE-2019-20811

This section provides more in-depth technical details about the vulnerability.

Vulnerability Description

The vulnerability in CVE-2019-20811 involves improper handling of a reference count in the Linux kernel, specifically in the functions rx_queue_add_kobject() and netdev_queue_add_kobject() in net/core/net-sysfs.c.

Affected Systems and Versions

Affected systems: Linux kernel versions before 5.0.6
Affected components: rx_queue_add_kobject() and netdev_queue_add_kobject() functions

Exploitation Mechanism

Attackers can potentially exploit this vulnerability by manipulating the mishandled reference count, leading to security breaches.

Mitigation and Prevention

To address CVE-2019-20811 and enhance system security, consider the following mitigation strategies:

Immediate Steps to Take

Update to Linux kernel version 5.0.6 or later to mitigate the vulnerability
Monitor for any suspicious activities on the system

Long-Term Security Practices

Regularly update the Linux kernel and other software components
Implement access controls and restrictions to minimize the attack surface

Patching and Updates

Apply security patches promptly to address known vulnerabilities and enhance system security