CVE-2020-11884 : Exploit Details and Defense Strategies

In the Linux kernel 4.19 through 5.6.7 on the s390 platform, a vulnerability exists that could lead to code execution due to a race condition. This flaw, identified as CID-3f777e19d171, is located in the enable_sacf_uaccess function in arch/s390/lib/uaccess.c, where it fails to protect against a concurrent page table upgrade, potentially resulting in a system crash.

Understanding CVE-2020-11884

This section provides insights into the nature and impact of the CVE-2020-11884 vulnerability.

What is CVE-2020-11884?

The CVE-2020-11884 vulnerability is a race condition in the Linux kernel on the s390 platform that could allow for code execution and system crashes.

The Impact of CVE-2020-11884

The vulnerability could be exploited to execute arbitrary code and potentially crash the system, posing a significant risk to affected systems.

Technical Details of CVE-2020-11884

Explore the technical aspects of the CVE-2020-11884 vulnerability.

Vulnerability Description

The vulnerability arises from a race condition in the enable_sacf_uaccess function in arch/s390/lib/uaccess.c, allowing for code execution and system crashes.

Affected Systems and Versions

Linux kernel versions 4.19 through 5.6.7 on the s390 platform

Exploitation Mechanism

The vulnerability can be exploited due to a lack of protection against concurrent page table upgrades, enabling attackers to execute malicious code.

Mitigation and Prevention

Learn how to mitigate the risks associated with CVE-2020-11884.

Immediate Steps to Take

Apply the latest security patches provided by the Linux kernel maintainers
Monitor official sources for updates and advisories related to this vulnerability

Long-Term Security Practices

Regularly update the Linux kernel to the latest stable version
Implement strong access controls and monitoring mechanisms to detect and prevent unauthorized code execution

Patching and Updates

Stay informed about security updates and patches released by the Linux kernel community
Prioritize the installation of patches addressing the CVE-2020-11884 vulnerability