CVE-2021-41840 : What You Need to Know

An issue was discovered in NvmExpressDxe in the kernel 5.0 through 5.5 in Insyde InsydeH2O that allows an attacker to execute arbitrary code.

Understanding CVE-2021-41840

This CVE involves a vulnerability in Insyde InsydeH2O that enables unauthorized access to the System Management Mode.

What is CVE-2021-41840?

The vulnerability in NvmExpressDxe in the specified kernel versions allows attackers to execute arbitrary code due to Inclusion of Functionality from an Untrusted Control Sphere.

The Impact of CVE-2021-41840

The vulnerability permits attackers to access System Management Mode, which can lead to unauthorized code execution and potential system compromise.

Technical Details of CVE-2021-41840

This section provides in-depth technical details of the vulnerability.

Vulnerability Description

The issue arises from an SMM callout within NvmExpressDxe that permits attackers to execute arbitrary code.

Affected Systems and Versions

Affected Kernel Versions: 5.0 to 5.5

Exploitation Mechanism

Attackers exploit the SMM callout in Insyde InsydeH2O to gain access to the System Management Mode and run arbitrary code.

Mitigation and Prevention

Protect your systems by following the recommended mitigation steps and security practices.

Immediate Steps to Take

Apply security patches provided by the vendor promptly
Monitor system logs for any unusual activities

Long-Term Security Practices

Implement strict access controls to limit unauthorized access
Regularly update system firmware and software

Patching and Updates

Stay informed about security updates and apply patches promptly to prevent exploitation of this vulnerability.