CVE-2019-15118 : Security Advisory and Response

A vulnerability in the Linux kernel up to version 5.2.9 can lead to kernel stack exhaustion due to recursion mishandling in the check_input_term function in sound/usb/mixer.c.

Understanding CVE-2019-15118

This CVE identifies a specific flaw in the Linux kernel that can be exploited to exhaust the kernel stack, potentially leading to a denial of service condition.

What is CVE-2019-15118?

The vulnerability arises from the mishandling of recursion in the check_input_term function within the sound/usb/mixer.c file of the Linux kernel up to version 5.2.9.

The Impact of CVE-2019-15118

The exploitation of this vulnerability can result in the exhaustion of the kernel stack, potentially leading to a denial of service (DoS) condition on the affected system.

Technical Details of CVE-2019-15118

This section delves into the technical aspects of the CVE, including the vulnerability description, affected systems and versions, and the exploitation mechanism.

Vulnerability Description

The check_input_term function in sound/usb/mixer.c in the Linux kernel through version 5.2.9 mishandles recursion, which can exhaust the kernel stack.

Affected Systems and Versions

Linux kernel versions up to 5.2.9

Exploitation Mechanism

The vulnerability can be exploited by triggering the mishandling of recursion in the check_input_term function, leading to the exhaustion of the kernel stack.

Mitigation and Prevention

In this section, we outline the steps to mitigate and prevent the exploitation of CVE-2019-15118.

Immediate Steps to Take

Apply the necessary security patches provided by the Linux kernel maintainers promptly.
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 ensure all security patches are applied.
Implement proper security measures and best practices to safeguard against potential DoS attacks.

Patching and Updates

Ensure that the Linux kernel is regularly updated to the latest version to address known vulnerabilities and enhance system security.