CVE-2020-7053 : Security Advisory and Response

A use-after-free vulnerability in the Linux kernel versions 4.14 to 4.14.165, 4.19 to 4.19.96, and pre-5.2 could allow an attacker to execute arbitrary code.

Understanding CVE-2020-7053

This CVE involves a use-after-free vulnerability in the i915_ppgtt_close function in the Linux kernel's GPU driver.

What is CVE-2020-7053?

The vulnerability, also known as CID-7dc40713618c, is triggered by improper handling of memory in the i915_ppgtt_close function.

The Impact of CVE-2020-7053

Exploitation of this vulnerability could lead to arbitrary code execution or a denial of service (DoS) condition on the affected system.

Technical Details of CVE-2020-7053

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

Vulnerability Description

The use-after-free vulnerability occurs in the i915_ppgtt_close function within the GPU driver of the Linux kernel.

Affected Systems and Versions

Linux kernel versions 4.14 to 4.14.165
Linux kernel versions 4.19 to 4.19.96
Linux kernel versions prior to 5.2

Exploitation Mechanism

Attackers can exploit this vulnerability by executing specially crafted code to trigger the use-after-free condition in the i915_ppgtt_close function.

Mitigation and Prevention

Protecting systems from CVE-2020-7053 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply security patches provided by the Linux kernel maintainers promptly.
Monitor vendor advisories for updates and follow best security practices.

Long-Term Security Practices

Regularly update the Linux kernel to the latest stable version.
Implement proper access controls and network segmentation to limit the impact of potential attacks.

Patching and Updates

Refer to vendor advisories such as USN-4255-1, USN-4255-2, USN-4285-1, USN-4287-1, USN-4287-2, and openSUSE-SU-2020:0336 for patching guidance and updates.