CVE-2021-39686 Explained : Impact and Mitigation

This CVE-2021-39686 involves a potential elevation of privilege vulnerability in the Android kernel due to a race condition in binder.c that could allow local escalation of privilege without additional execution privileges.

Understanding CVE-2021-39686

This vulnerability allows for a misrepresentation of the domain to SELinux, potentially leading to local privilege escalation without the need for user interaction.

What is CVE-2021-39686?

An elevation of privilege vulnerability in Android kernel
Exploitable without user interaction

The Impact of CVE-2021-39686

Local escalation of privilege without additional execution privileges

Technical Details of CVE-2021-39686

This section provides more insights into the vulnerability.

Vulnerability Description

Occurs in several functions of binder.c
Arises from misrepresenting the domain to SELinux due to a race condition

Affected Systems and Versions

Product: Android
Versions: Android kernel

Exploitation Mechanism

Exploitable without the need for user interaction

Mitigation and Prevention

Here are the essential steps to mitigate the CVE-2021-39686 vulnerability.

Immediate Steps to Take

Apply security patches promptly
Monitor vendor security bulletins
Implement SELinux policies to restrict unauthorized access

Long-Term Security Practices

Regularly update systems and software
Conduct security awareness training for users and administrators

Patching and Updates

Regularly check for security updates for the affected systems
Ensure timely deployment of patches to address known vulnerabilities