CVE-2021-38787 : Vulnerability Insights and Analysis

An integer overflow vulnerability has been identified in the ION driver "/dev/ion" of Allwinner R818 SoC Android Q SDK V1.0. This vulnerability allows an attacker to use a specific ioctl cmd to trigger a system crash, resulting in a denial of service.

Understanding CVE-2021-38787

This section will provide insights into the nature and impact of the CVE-2021-38787 vulnerability.

What is CVE-2021-38787?

The CVE-2021-38787 vulnerability is an integer overflow issue in the ION driver of Allwinner R818 SoC Android Q SDK V1.0. By exploiting the ioctl cmd "COMPAT_ION_IOC_SUNXI_FLUSH_RANGE," an attacker can cause a system crash.

The Impact of CVE-2021-38787

The impact of the CVE-2021-38787 vulnerability is a denial of service due to the ability to crash the system using a specific ioctl cmd.

Technical Details of CVE-2021-38787

This section will delve into the technical aspects of CVE-2021-38787, including the vulnerability description, affected systems and versions, and the exploitation mechanism.

Vulnerability Description

The vulnerability resides in the ION driver "/dev/ion" of Allwinner R818 SoC Android Q SDK V1.0, leading to an integer overflow condition that can be triggered via the "COMPAT_ION_IOC_SUNXI_FLUSH_RANGE" ioctl cmd.

Affected Systems and Versions

The affected system by CVE-2021-38787 includes Allwinner R818 SoC Android Q SDK V1.0, exposing systems leveraging this SDK to the risk of a denial of service attack.

Exploitation Mechanism

By utilizing the vulnerable ioctl cmd "COMPAT_ION_IOC_SUNXI_FLUSH_RANGE," threat actors can exploit the integer overflow in the ION driver to crash the system.

Mitigation and Prevention

Here, we outline measures to mitigate the risks posed by CVE-2021-38787 and prevent potential exploitation.

Immediate Steps to Take

To address the CVE-2021-38787 vulnerability, it is crucial to apply immediate security measures such as implementing patches or workarounds provided by the vendor.

Long-Term Security Practices

Establishing robust security practices, including regular system updates, security monitoring, and threat intelligence integration, can enhance the overall security posture to mitigate similar vulnerabilities in the future.

Patching and Updates

Vendors typically release security patches to address identified vulnerabilities. It is recommended to apply relevant patches and updates to eliminate the risk associated with CVE-2021-38787.