CVE-2021-45486 Explained : Impact and Mitigation

In the IPv4 implementation in the Linux kernel before 5.12.4, net/ipv4/route.c has an information leak because the hash table is very small.

Understanding CVE-2021-45486

In this section, we will delve into the details of CVE-2021-45486.

What is CVE-2021-45486?

CVE-2021-45486 pertains to an information leak in the IPv4 implementation within the Linux kernel prior to version 5.12.4. The specific vulnerability is located in net/ipv4/route.c due to the inadequately small hash table.

The Impact of CVE-2021-45486

The vulnerability can lead to an information leak, potentially exposing sensitive data to unauthorized parties.

Technical Details of CVE-2021-45486

Let's explore the technical aspects of CVE-2021-45486.

Vulnerability Description

The issue arises from the small size of the hash table in net/ipv4/route.c within the Linux kernel version before 5.12.4, resulting in an information leak.

Affected Systems and Versions

Affected systems: Linux kernel versions before 5.12.4
Affected component: net/ipv4/route.c

Exploitation Mechanism

Attackers can exploit this vulnerability to gain unauthorized access to sensitive information through the compromised hash table.

Mitigation and Prevention

Learn how to protect your system from CVE-2021-45486.

Immediate Steps to Take

Update to the latest Linux kernel version (5.12.4 or newer) to mitigate the vulnerability.
Monitor for any signs of unauthorized access or data leakage.

Long-Term Security Practices

Regularly patch and update your system to address security vulnerabilities promptly.

Patching and Updates

Stay informed about security advisories and apply patches promptly to maintain a secure system.