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CVE-2021-4083 : Security Advisory and Response

Learn about CVE-2021-4083, a read-after-free memory flaw in the Linux kernel's garbage collection for Unix domain socket file handlers. Discover its impact, affected versions, and mitigation steps here.

A read-after-free memory flaw was discovered in the Linux kernel's garbage collection for Unix domain socket file handlers. This vulnerability allows a local user to crash the system or escalate privileges. Here's what you need to know about CVE-2021-4083.

Understanding CVE-2021-4083

This section will cover what CVE-2021-4083 is, its impact, technical details, mitigation, and prevention.

What is CVE-2021-4083?

CVE-2021-4083 is a read-after-free memory flaw in the Linux kernel's garbage collection for Unix domain socket file handlers. It arises from simultaneous calls to close() and fget(), potentially triggering a race condition.

The Impact of CVE-2021-4083

The vulnerability allows a local user to crash the system or elevate their privileges. It affects Linux kernel versions prior to 5.16-rc4.

Technical Details of CVE-2021-4083

Let's delve into the specifics of this vulnerability.

Vulnerability Description

The flaw originates from how users call close() and fget() simultaneously, leading to a race condition that can be exploited by a local user.

Affected Systems and Versions

Linux kernel versions before 5.16-rc4 are vulnerable to CVE-2021-4083.

Exploitation Mechanism

By triggering the race condition through simultaneous calls to close() and fget(), a local user can crash the system or escalate their privileges.

Mitigation and Prevention

Discover the steps to mitigate the risks posed by CVE-2021-4083.

Immediate Steps to Take

Take immediate actions to secure your system against this vulnerability.

Long-Term Security Practices

Implement long-term security practices to enhance your system's resilience.

Patching and Updates

Stay updated with patches and security updates to protect your system from CVE-2021-4083.

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