CVE-2021-39656 Explained : Impact and Mitigation

This CVE-2021-39656 article provides details about a possible use-after-free vulnerability in Android's kernel, potentially leading to local privilege escalation.

Understanding CVE-2021-39656

This section delves into the specific details of CVE-2021-39656.

What is CVE-2021-39656?

CVE-2021-39656 involves a vulnerability in __configfs_open_file of file.c in Android's kernel. The issue stems from improper locking, allowing for a use-after-free scenario. The exploit could enable local privilege escalation within the kernel, requiring System execution privileges, without the need for user interaction.

The Impact of CVE-2021-39656

The vulnerability could result in an elevation of privilege within the affected system, posing a security risk that may lead to unauthorized access or further exploitation.

Technical Details of CVE-2021-39656

Exploring the technical aspects of CVE-2021-39656.

Vulnerability Description

The vulnerability in __configfs_open_file of file.c presents a use-after-free risk due to improper locking mechanisms.

Affected Systems and Versions

Affected Product: Android
Affected Version: Android kernel

Exploitation Mechanism

The vulnerability can be exploited locally, allowing attackers to escalate privileges within the kernel without requiring any user interaction.

Mitigation and Prevention

Tips to mitigate the risks associated with CVE-2021-39656.

Immediate Steps to Take

Apply security patches promptly to address the vulnerability.
Monitor official sources for updates and advisories regarding this CVE.

Long-Term Security Practices

Implement strict access controls and least privilege principles.
Conduct regular security audits and assessments to identify and mitigate vulnerabilities.

Patching and Updates

Regularly update the affected systems with the latest security patches to safeguard against potential exploits.