CVE-2021-31795 : What You Need to Know

The PowerVR GPU kernel driver in pvrsrvkm.ko through 2021-04-24 for the Linux kernel, as used on Alcatel 1S phones, allows attackers to overwrite heap memory via PhysmemNewRamBackedPMR.

Understanding CVE-2021-31795

This section will provide an in-depth look at the CVE-2021-31795 vulnerability.

What is CVE-2021-31795?

The CVE-2021-31795 vulnerability lies within the PowerVR GPU kernel driver in the Linux kernel, specifically affecting Alcatel 1S phones. It enables attackers to overwrite heap memory through PhysmemNewRamBackedPMR.

The Impact of CVE-2021-31795

Exploitation of this vulnerability can have severe consequences, allowing attackers to manipulate heap memory, potentially leading to unauthorized access or system crashes.

Technical Details of CVE-2021-31795

Let's delve into the technical aspects of CVE-2021-31795.

Vulnerability Description

The vulnerability enables attackers to overwrite heap memory through the PowerVR GPU kernel driver in the Linux kernel.

Affected Systems and Versions

The PowerVR GPU kernel driver in pvrsrvkm.ko through 2021-04-24 for the Linux kernel is affected, specifically on Alcatel 1S phones.

Exploitation Mechanism

Attackers exploit the vulnerability by manipulating heap memory via PhysmemNewRamBackedPMR.

Mitigation and Prevention

Understanding how to mitigate and prevent CVE-2021-31795 is crucial.

Immediate Steps to Take

To mitigate the risk, users should apply relevant patches and security updates as soon as they become available.

Long-Term Security Practices

Maintaining good security practices, such as regular system updates and following security best practices, can help prevent potential exploitation of this vulnerability.

Patching and Updates

Vendors are advised to release patches and updates addressing the vulnerability promptly to protect users from potential security threats.