CVE-2021-32606 Explained : Impact and Mitigation
Learn about CVE-2021-32606 affecting Linux kernel versions 5.11 through 5.12.2, allowing local users to escalate privileges to root. Find mitigation strategies and best practices for prevention.
Linux kernel versions 5.11 through 5.12.2 are impacted by CVE-2021-32606, where a vulnerability in isotp_setsockopt in net/can/isotp.c can be exploited for privilege escalation to root through a use-after-free issue.
Understanding CVE-2021-32606
This section delves into the details of the CVE-2021-32606 vulnerability.
What is CVE-2021-32606?
CVE-2021-32606 affects the Linux kernel versions 5.11 through 5.12.2, enabling a local user to escalate privileges to root by leveraging a use-after-free vulnerability in isotp_setsockopt in net/can/isotp.c.
The Impact of CVE-2021-32606
The impact of this vulnerability is the privilege escalation to root level, potentially leading to unauthorized access and control over the affected system.
Technical Details of CVE-2021-32606
This section provides technical insights into the CVE-2021-32606 vulnerability.
Vulnerability Description
The vulnerability in isotp_setsockopt in net/can/isotp.c in Linux kernel versions 5.11 through 5.12.2 enables a local attacker to escalate privileges to root via a use-after-free flaw.
Affected Systems and Versions
Linux kernel versions 5.11 through 5.12.2 are affected by this vulnerability, while earlier versions lacking CAN ISOTP SF_BROADCAST support remain unaffected.
Exploitation Mechanism
The CVE-2021-32606 vulnerability can be exploited by a local attacker to trigger a use-after-free condition in isotp_setsockopt, leading to privilege escalation to root.
Mitigation and Prevention
This section outlines mitigation strategies to address the CVE-2021-32606 vulnerability.
Immediate Steps to Take
Users are advised to update their Linux kernel to a patched version immediately to mitigate the risk of privilege escalation.
Long-Term Security Practices
Implementing least privilege principles, monitoring system activity, and regular security updates are essential for maintaining a secure environment.
Patching and Updates
Regularly check for security advisories and apply patches promptly to protect systems from known vulnerabilities.