CVE-2021-39735 : What You Need to Know

This CVE-2021-39735 article provides details about a memory corruption vulnerability in the Android kernel that could potentially lead to local privilege escalation.

Understanding CVE-2021-39735

CVE-2021-39735 is a vulnerability in the Android kernel that can be exploited to achieve local privilege escalation.

What is CVE-2021-39735?

In gasket_alloc_coherent_memory of gasket_page_table.c, a memory corruption vulnerability exists due to a race condition. Exploiting this vulnerability could allow an attacker to escalate privileges locally without requiring user interaction.

The Impact of CVE-2021-39735

The vulnerability could lead to a local escalation of privilege with System execution privileges required, posing a serious security risk.

Technical Details of CVE-2021-39735

This section provides detailed technical information about the vulnerability.

Vulnerability Description

Vulnerability Location: gasket_alloc_coherent_memory of gasket_page_table.c
Type: Memory corruption
Exploitation Risk: Local privilege escalation

Affected Systems and Versions

Product: Android
Versions Affected: Android kernel

Exploitation Mechanism

The vulnerability is exploitable due to a race condition in gasket_alloc_coherent_memory, allowing attackers to corrupt memory and escalate privileges.

Mitigation and Prevention

Here are some steps to mitigate the risks associated with CVE-2021-39735.

Immediate Steps to Take

Monitor security bulletins from the vendor for patches
Apply security updates promptly

Long-Term Security Practices

Implement the principle of least privilege
Regularly update and patch systems

Patching and Updates

Stay informed about security advisories and updates from Android to patch the vulnerability promptly.