CVE-2021-4135 : What You Need to Know

A memory leak vulnerability was found in the Linux kernel's eBPF for the Simulated networking device driver, allowing unauthorized access to data.

Understanding CVE-2021-4135

This CVE identifies a memory leak vulnerability in the Linux kernel's eBPF affecting versions prior to 5.16-rc6.

What is CVE-2021-4135?

CVE-2021-4135 is a memory leak vulnerability in the Linux kernel's eBPF that allows a local user to gain unauthorized access to data by exploiting the Simulated networking device driver.

The Impact of CVE-2021-4135

This vulnerability could be exploited by a local user to access unauthorized data, posing a security risk to affected systems.

Technical Details of CVE-2021-4135

This section provides technical details about the vulnerability.

Vulnerability Description

The vulnerability exists in the way a user uses BPF for the Simulated networking device driver, specifically in the function nsim_map_alloc_elem.

Affected Systems and Versions

Linux kernel versions prior to 5.16-rc6 are affected by CVE-2021-4135.

Exploitation Mechanism

A local user can exploit this flaw in the eBPF to gain unauthorized access to certain data.

Mitigation and Prevention

Protecting systems from CVE-2021-4135 requires immediate action and long-term security practices.

Immediate Steps to Take

Users should apply patches and updates provided by the Linux kernel to mitigate the vulnerability promptly.

Long-Term Security Practices

Implementing proper access controls, monitoring user activities, and regular security updates can enhance system security.

Patching and Updates

Regularly install security patches and updates from the Linux kernel to address vulnerabilities like CVE-2021-4135.