CVE-2021-26338 : Security Advisory and Response
Discover the impact of CVE-2021-26338, a vulnerability in AMD processors enabling attackers to override performance control tables. Learn about affected systems, exploitation risks, and mitigation steps.
A vulnerability has been identified in AMD processors that could allow attackers to manipulate performance control tables, potentially leading to a depletion of system resources.
Understanding CVE-2021-26338
This CVE-2021-26338 describes an issue related to improper access controls in the System Management Unit (SMU) of AMD processors, enabling attackers to override performance control tables stored in DRAM.
What is CVE-2021-26338?
The vulnerability in AMD processors allows unauthorized access to performance control tables, potentially resulting in a lack of system resources due to malicious manipulation.
The Impact of CVE-2021-26338
If exploited, this vulnerability could lead to performance degradation and resource exhaustion on systems utilizing affected AMD processors.
Technical Details of CVE-2021-26338
The technical details of this vulnerability include a CWE-284 classification denoting improper access control leading to potential system resource depletion.
Vulnerability Description
Improper access controls in the System Management Unit (SMU) of AMD processors may enable attackers to manipulate performance control tables in DRAM, affecting system performance.
Affected Systems and Versions
Affected systems include 2nd Gen AMD EPYC and 3rd Gen AMD EPYC processors with specific firmware versions detailed in the CVE report.
Exploitation Mechanism
Attackers can exploit this vulnerability by bypassing access controls in the SMU, allowing them to modify performance control tables and impact system resource allocation.
Mitigation and Prevention
To mitigate the risks associated with CVE-2021-26338, immediate steps should be taken followed by long-term security practices and timely patching.
Immediate Steps to Take
Update AMD processors to the latest firmware versions provided by AMD to address the vulnerability and enhance system security.
Long-Term Security Practices
Implement strict access controls, regular security audits, and monitoring to prevent unauthorized access and ensure the integrity of system resources.
Patching and Updates
Stay informed about security bulletins and patches released by AMD to address vulnerabilities promptly and maintain a secure environment.