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.