CVE-2021-3612 : Vulnerability Insights and Analysis
Learn about CVE-2021-3612, a critical vulnerability in the Linux kernel's joystick devices subsystem before version 5.9-rc1. Understand the impact, affected systems, exploitation, and mitigation steps.
An out-of-bounds memory write flaw was found in the Linux kernel's joystick devices subsystem, allowing a local user to crash the system or potentially escalate privileges. This vulnerability affects versions before 5.9-rc1, posing risks to confidentiality, integrity, and system availability.
Understanding CVE-2021-3612
This section provides insights into the nature and impact of CVE-2021-3612.
What is CVE-2021-3612?
CVE-2021-3612 is a vulnerability in the Linux kernel's joystick devices subsystem, specifically in the way the user calls ioctl JSIOCSBTNMAP. This flaw can be exploited by a local user to crash the system or elevate their privileges.
The Impact of CVE-2021-3612
The highest threat from CVE-2021-3612 is to the confidentiality, integrity, and availability of the affected systems. It could lead to system crashes or unauthorized privilege escalation.
Technical Details of CVE-2021-3612
Explore the technical aspects of CVE-2021-3612 in this section.
Vulnerability Description
The vulnerability arises from an out-of-bounds memory write flaw in the Linux kernel's joystick devices subsystem, present in versions prior to 5.9-rc1. It stems from how the user invokes ioctl JSIOCSBTNMAP.
Affected Systems and Versions
Systems running Linux kernel versions before 5.9-rc1 are vulnerable to CVE-2021-3612. Users should check their system versions for exposure.
Exploitation Mechanism
Local users can exploit this vulnerability to trigger an out-of-bounds memory write, potentially crashing the system or gaining unauthorized system privileges.
Mitigation and Prevention
Discover effective strategies to mitigate and prevent exploits related to CVE-2021-3612.
Immediate Steps to Take
Users are advised to update their Linux kernel to version 5.9-rc1 or later to address the CVE-2021-3612 vulnerability. Regularly check for security updates and apply them promptly.
Long-Term Security Practices
Implementing least privilege access, monitoring system activities, and conducting regular security audits can enhance the overall security posture and help prevent similar vulnerabilities.
Patching and Updates
Kernel patches addressing CVE-2021-3612 are available. Keep track of security advisories from Linux distributions and apply recommended patches promptly to safeguard systems.