CVE-2020-15393 : Security Advisory and Response

In the Linux kernel 4.4 through 5.7.6, usbtest_disconnect in drivers/usb/misc/usbtest.c has a memory leak, aka CID-28ebeb8db770.

Understanding CVE-2020-15393

What is CVE-2020-15393?

CVE-2020-15393 is a memory leak vulnerability found in the Linux kernel versions 4.4 through 5.7.6, specifically in the usbtest_disconnect function in drivers/usb/misc/usbtest.c.

The Impact of CVE-2020-15393

This vulnerability could allow a local attacker to cause a denial of service (DoS) condition by consuming excessive memory resources on the affected system.

Technical Details of CVE-2020-15393

Vulnerability Description

The vulnerability exists in the usbtest_disconnect function in the Linux kernel, leading to a memory leak issue.

Affected Systems and Versions

Linux kernel versions 4.4 through 5.7.6

Exploitation Mechanism

An attacker with local access to the system could exploit this vulnerability by executing specially crafted applications to trigger the memory leak.

Mitigation and Prevention

Immediate Steps to Take

Apply the official patches provided by the Linux kernel maintainers to address the memory leak vulnerability.
Monitor system resources for any unusual memory consumption that could indicate exploitation.

Long-Term Security Practices

Regularly update the Linux kernel to the latest stable version to ensure all security patches are applied.
Implement proper access controls and restrictions to limit the impact of potential memory-related vulnerabilities.

Patching and Updates

Keep the Linux kernel up to date with the latest security patches and fixes to prevent exploitation of known vulnerabilities.