CVE-2020-10768 : Security Advisory and Response
Discover the impact of CVE-2020-10768 on the Linux Kernel before version 5.8-rc1. Learn about the vulnerability, affected systems, exploitation risks, and mitigation steps.
A flaw in the Linux Kernel before 5.8-rc1 allows enabling indirect branch speculation, potentially leading to Spectre v2 attacks.
Understanding CVE-2020-10768
This CVE involves a vulnerability in the prctl() function of the Linux Kernel, impacting system security.
What is CVE-2020-10768?
The flaw in the prctl() function of the Linux Kernel before version 5.8-rc1 can be exploited to enable indirect branch speculation, leaving the system vulnerable to Spectre v2 attacks. The primary risk posed by this vulnerability is to confidentiality.
The Impact of CVE-2020-10768
The vulnerability has a CVSS base score of 5.5, indicating a medium severity issue with high confidentiality impact but no availability or integrity impact. The attack complexity is low, requiring local access with low privileges.
Technical Details of CVE-2020-10768
This section provides more in-depth technical insights into the CVE.
Vulnerability Description
The flaw in the prctl() function incorrectly reports branch speculation as 'force disabled,' allowing for its exploitation and potentially exposing the system to Spectre v2 attacks.
Affected Systems and Versions
- Product: Linux Kernel
- Vendor: Linux Kernel
- Versions Affected: Before 5.8-rc1
Exploitation Mechanism
The vulnerability can be exploited by enabling indirect branch speculation after it has been disabled, leading to potential Spectre v2 attacks.
Mitigation and Prevention
Protecting systems from CVE-2020-10768 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Apply relevant patches and updates provided by the Linux Kernel maintainers.
- Monitor official sources for security advisories and follow best practices for secure system configuration.
Long-Term Security Practices
- Regularly update the Linux Kernel to the latest stable version to mitigate known vulnerabilities.
- Implement secure coding practices and conduct regular security audits to identify and address potential risks.
Patching and Updates
Ensure timely installation of security patches released by the Linux Kernel maintainers to address the CVE-2020-10768 vulnerability.