CVE-2019-19807 : Vulnerability Insights and Analysis

A use-after-free vulnerability in the Linux kernel before version 5.3.11 due to incorrect code refactoring in sound/core/timer.c.

Understanding CVE-2019-19807

This CVE involves a use-after-free vulnerability in the Linux kernel, impacting versions before 5.3.11.

What is CVE-2019-19807?

Prior to version 5.3.11 of the Linux kernel, an issue arose in sound/core/timer.c due to incorrect code refactoring. This issue, known as CID-e7af6307a8a5, resulted in a use-after-free vulnerability. The problem lies in the functions snd_timer_open and snd_timer_close_locked.

The Impact of CVE-2019-19807

The use-after-free vulnerability could potentially allow an attacker to execute arbitrary code or cause a denial of service (DoS) on affected systems.

Technical Details of CVE-2019-19807

Details about the vulnerability and affected systems.

Vulnerability Description

In the Linux kernel before 5.3.11, a use-after-free vulnerability was caused by erroneous code refactoring in sound/core/timer.c. This issue is identified as CID-e7af6307a8a5 and affects the functions snd_timer_open and snd_timer_close_locked.

Affected Systems and Versions

Linux kernel versions before 5.3.11

Exploitation Mechanism

The vulnerability could be exploited by an attacker to manipulate the timeri variable for malicious purposes after the code refactoring.

Mitigation and Prevention

Ways to address and prevent the CVE-2019-19807 vulnerability.

Immediate Steps to Take

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

Long-Term Security Practices

Regularly update the Linux kernel to the latest stable version.
Implement proper code review processes to prevent similar vulnerabilities in the future.

Patching and Updates

Update to Linux kernel version 5.3.11 or newer to mitigate the use-after-free vulnerability.