CVE-2021-20226 Explained : Impact and Mitigation

A detailed analysis of the use-after-free flaw found in the io_uring in the Linux kernel, impacting data integrity, confidentiality, and system availability.

Understanding CVE-2021-20226

This section delves into the nature and impact of the identified vulnerability.

What is CVE-2021-20226?

A use-after-free flaw in the io_uring in Linux kernel allows a local attacker with user privilege to trigger a denial of service affecting system integrity, confidentiality, and availability.

The Impact of CVE-2021-20226

The lack of object validation before operations could lead to a threat against data integrity, confidentiality, and system availability.

Technical Details of CVE-2021-20226

Explore the technical aspects of the CVE to gain a better understanding.

Vulnerability Description

The vulnerability arises due to insufficient validation of object existence before operations, caused by failing to increment the file reference counter while in use.

Affected Systems and Versions

The vulnerability affects systems running the Linux kernel version 5.10.

Exploitation Mechanism

Local attackers with user privileges can exploit the vulnerability, resulting in denial of service problems on the affected system.

Mitigation and Prevention

Discover the measures to mitigate the risks posed by CVE-2021-20226.

Immediate Steps to Take

Users are advised to apply relevant security patches and updates promptly to address the vulnerability.

Long-Term Security Practices

Implement secure coding practices, regularly update systems, and restrict privileges to enhance overall security.

Patching and Updates

Regularly monitor for security advisories and ensure all patches relevant to CVE-2021-20226 are applied in a timely manner.