CVE-2019-11811 Explained : Impact and Mitigation

A problem was found in the Linux kernel prior to version 5.0.4 involving a use-after-free scenario related to the ipmi_si module removal.

Understanding CVE-2019-11811

This CVE involves a use-after-free vulnerability in the Linux kernel before version 5.0.4, specifically when attempting to read /proc/ioports after removing the ipmi_si module.

What is CVE-2019-11811?

This CVE identifies a use-after-free issue in the Linux kernel that occurs when accessing /proc/ioports after removing the ipmi_si module. The problem is associated with specific files within the kernel.

The Impact of CVE-2019-11811

The vulnerability could allow an attacker to exploit the use-after-free scenario, potentially leading to a denial of service (DoS) or arbitrary code execution.

Technical Details of CVE-2019-11811

This section provides more in-depth technical information about the CVE.

Vulnerability Description

The issue in the Linux kernel before version 5.0.4 involves a use-after-free condition triggered by accessing /proc/ioports post the removal of the ipmi_si module. The problem is linked to certain files within the kernel.

Affected Systems and Versions

Linux kernel versions before 5.0.4 are affected by this vulnerability.

Exploitation Mechanism

An attacker could potentially exploit this vulnerability by manipulating the use-after-free scenario to execute arbitrary code or cause a DoS condition.

Mitigation and Prevention

To address CVE-2019-11811, follow these mitigation strategies:

Immediate Steps to Take

Apply patches provided by the Linux kernel maintainers.
Monitor official sources for updates and security advisories.

Long-Term Security Practices

Regularly update the Linux kernel to the latest stable version.
Implement proper access controls and monitoring mechanisms to detect unusual behavior.

Patching and Updates

Keep the Linux kernel up to date with the latest security patches and fixes.