CVE-2021-3635 : What You Need to Know

A flaw was identified in the Linux kernel netfilter implementation before version 5.5-rc7. This vulnerability allows a user with root access to cause a system panic by executing netfilter netflow commands.

Understanding CVE-2021-3635

This section provides an overview of CVE-2021-3635.

What is CVE-2021-3635?

The CVE-2021-3635 vulnerability exists in the Linux kernel netfilter implementation prior to version 5.5-rc7. An attacker with root access can trigger a system panic using specific netflow commands.

The Impact of CVE-2021-3635

Exploitation of this vulnerability can lead to a denial of service (DoS) condition, causing system instability and disruption.

Technical Details of CVE-2021-3635

Let's delve into the technical aspects of CVE-2021-3635.

Vulnerability Description

The flaw in the netfilter implementation allows a user with root privileges to crash the system by executing certain netflow commands.

Affected Systems and Versions

Systems running Linux kernel versions prior to 5.5-rc7 are vulnerable to this exploit. Specifically, users on kernel 5.5-rc7 are impacted.

Exploitation Mechanism

By leveraging root (CAP_SYS_ADMIN) access, an attacker can exploit the netfilter flaw to trigger a system panic through netflow commands.

Mitigation and Prevention

Learn how to mitigate the risks posed by CVE-2021-3635.

Immediate Steps to Take

It is crucial to apply relevant patches provided by the Linux kernel maintainers to address this vulnerability promptly.

Long-Term Security Practices

Enhance your system security by following best practices, limiting root access, and implementing principle of least privilege (PoLP) across roles.

Patching and Updates

Regularly update your Linux kernel to the latest stable version and stay informed about security advisories to protect your system from potential threats.