CVE-2021-39793 : Security Advisory and Response

This CVE-2021-39793 article provides insights into a potential elevation of privilege vulnerability in Android's kernel.

Understanding CVE-2021-39793

This section delves into the details of the identified vulnerability.

What is CVE-2021-39793?

The CVE-2021-39793 vulnerability exists in kbase_jd_user_buf_pin_pages of mali_kbase_mem.c. It allows for an out-of-bounds write, potentially enabling a local attacker to escalate privileges without additional execution rights.

The Impact of CVE-2021-39793

The vulnerability could lead to a local elevation of privilege without the need for user interaction, posing a security risk to affected systems.

Technical Details of CVE-2021-39793

In this section, we explore the technical aspects of CVE-2021-39793.

Vulnerability Description

The flaw stems from a logic error in the code, specifically in kbase_jd_user_buf_pin_pages of mali_kbase_mem.c, facilitating the out-of-bounds write.

Affected Systems and Versions

Product: Android
Versions: Android kernel

Exploitation Mechanism

The vulnerability can be exploited locally by an attacker without requiring additional privileges, potentially leading to privilege escalation.

Mitigation and Prevention

Learn how to mitigate and prevent the CVE-2021-39793 vulnerability.

Immediate Steps to Take

Patch affected systems promptly to address the vulnerability.
Monitor vendor updates for security patches related to this issue.

Long-Term Security Practices

Conduct regular security assessments to identify and address vulnerabilities proactively.
Implement the principle of least privilege to limit potential attack surfaces.

Patching and Updates

Regularly apply security patches from the official vendor to ensure system protection against known vulnerabilities.