CVE-2021-34693 : Security Advisory and Response

A local information disclosure vulnerability, CVE-2021-34693, affects the Linux kernel through version 5.12.10. The vulnerability in net/can/bcm.c allows local users to access sensitive information from kernel stack memory due to uninitialized portions of a data structure.

Understanding CVE-2021-34693

This section provides insights into the nature and impact of the CVE-2021-34693 vulnerability.

What is CVE-2021-34693?

The CVE-2021-34693 vulnerability impacts the Linux kernel, enabling local users to obtain sensitive information from kernel stack memory through uninitialized data structure elements.

The Impact of CVE-2021-34693

The vulnerability poses a risk to the confidentiality of sensitive information stored in the kernel stack memory, potentially allowing unauthorized access by local users.

Technical Details of CVE-2021-34693

This section delves into the technical aspects of CVE-2021-34693 for better understanding and mitigation.

Vulnerability Description

The flaw in net/can/bcm.c within the Linux kernel allows local attackers to expose sensitive kernel memory, potentially leading to information leakage.

Affected Systems and Versions

All Linux kernel versions up to 5.12.10 are vulnerable to this information disclosure issue, impacting systems where unauthorized users have local access.

Exploitation Mechanism

Exploiting this vulnerability requires local access to the targeted system, enabling attackers to retrieve confidential information from kernel stack memory.

Mitigation and Prevention

Understanding the immediate steps and long-term strategies to mitigate the CVE-2021-34693 vulnerability is essential for ensuring system security.

Immediate Steps to Take

System administrators are advised to apply relevant security updates promptly to patch the vulnerability and prevent unauthorized access to sensitive kernel information.

Long-Term Security Practices

Implementing strong access controls and regular security monitoring can help prevent unauthorized access attempts and improve the overall security posture of systems.

Patching and Updates

Regularly updating the Linux kernel to the latest secure versions is crucial for addressing known vulnerabilities and enhancing system security.