CVE-2021-28375 : What You Need to Know

An issue was discovered in the Linux kernel through version 5.11.6 that allows user applications to send kernel RPC messages, known as CID-20c40794eb85. This vulnerability is related to CVE-2019-2308.

Understanding CVE-2021-28375

This section will cover what CVE-2021-28375 is, its impacts, technical details, and mitigation strategies.

What is CVE-2021-28375?

CVE-2021-28375 is a security vulnerability discovered in the Linux kernel that enables user applications to send kernel RPC messages, potentially leading to unauthorized access and system compromise.

The Impact of CVE-2021-28375

The impact of this CVE includes the risk of exploitation by malicious actors to gain elevated privileges, execute arbitrary code, or launch denial of service attacks on affected systems.

Technical Details of CVE-2021-28375

This section provides a deeper insight into the vulnerability, affected systems, and exploitation mechanisms.

Vulnerability Description

The vulnerability exists in fastrpc_internal_invoke in drivers/misc/fastrpc.c in the Linux kernel through version 5.11.6, allowing user applications to send kernel RPC messages.

Affected Systems and Versions

All Linux kernel versions up to 5.11.6 are affected by this vulnerability, potentially impacting a wide range of systems using these versions.

Exploitation Mechanism

Malicious actors can exploit this vulnerability by crafting and sending specific RPC messages to the kernel, potentially leading to unauthorized actions.

Mitigation and Prevention

Protecting systems from CVE-2021-28375 requires immediate action and long-term security practices.

Immediate Steps to Take

It is recommended to apply vendor patches promptly, monitor system logs for any suspicious activities, and restrict user permissions to minimize the risk of exploitation.

Long-Term Security Practices

Implementing security best practices such as regular system updates, network segmentation, and access controls can bolster defenses against similar vulnerabilities in the future.

Patching and Updates

Regularly check for and apply security patches provided by the Linux kernel maintainers to address CVE-2021-28375 and enhance system security.