CVE-2021-4002 : Vulnerability Insights and Analysis

A memory leak flaw in the Linux kernel's hugetlbfs memory usage allows unauthorized access to sensitive data by a local user.

Understanding CVE-2021-4002

This CVE describes a memory leak vulnerability in the Linux kernel that could be exploited by a local attacker to gain unauthorized access to data.

What is CVE-2021-4002?

The vulnerability arises from the way the user maps memory regions twice using shmget(), potentially leading to unauthorized data access.

The Impact of CVE-2021-4002

The flaw could allow a local user to exploit the memory leak and gain access to sensitive data, posing a security risk to affected systems.

Technical Details of CVE-2021-4002

This section provides more in-depth technical details about the CVE.

Vulnerability Description

The vulnerability in the Linux kernel's hugetlbfs memory usage enables a local user to map some memory regions twice, leading to unauthorized data access.

Affected Systems and Versions

The flaw affects kernel versions from v3.6 through v5.15.5, potentially impacting a wide range of Linux systems.

Exploitation Mechanism

The vulnerability can be exploited by a local user through specific memory mapping techniques, allowing them to bypass security measures and access sensitive data.

Mitigation and Prevention

It is crucial to take immediate steps to secure systems and prevent exploitation.

Immediate Steps to Take

Users are advised to apply relevant security updates and patches provided by Linux distributions to mitigate the vulnerability.

Long-Term Security Practices

Implementing proper access controls and monitoring mechanisms can help prevent unauthorized data access and enhance overall system security.

Patching and Updates

Regularly check for security advisories from the Linux kernel community and apply patches promptly to protect systems from potential exploits.