CVE-2021-39685 : What You Need to Know

This article provides details about CVE-2021-39685, a vulnerability in the Android kernel that could lead to local privilege escalation without additional execution privileges.

Understanding CVE-2021-39685

CVE-2021-39685 is a vulnerability in the Android kernel that can result in a local escalation of privilege without requiring any extra execution privileges.

What is CVE-2021-39685?

In various setup methods of the USB gadget subsystem in Android, an out-of-bounds write can occur due to an incorrect flag check. This issue can be exploited for local privilege escalation without the need for user interaction.

The Impact of CVE-2021-39685

The vulnerability can lead to a local escalation of privilege without additional execution privileges. This could potentially be exploited by attackers to gain elevated privileges on affected devices.

Technical Details of CVE-2021-39685

CVE-2021-39685 involves the following technical aspects:

Vulnerability Description

Out-of-bounds write vulnerability in the USB gadget subsystem setup methods.
Incorrect flag check can lead to the issue.

Affected Systems and Versions

Product: Android
Affected Version: Android kernel

Exploitation Mechanism

The vulnerability can be exploited locally without requiring user interaction.

Mitigation and Prevention

Taking immediate steps and following long-term security practices are essential to mitigate the impact of CVE-2021-39685.

Immediate Steps to Take

Apply security patches provided by the vendor.
Monitor for any unusual activities on the system.

Long-Term Security Practices

Regularly update the device with the latest security patches.
Implement the principle of least privilege to limit potential exploitation.

Patching and Updates

Stay informed about security bulletins and updates from the Android security team.