CVE-2017-5577 : Vulnerability Insights and Analysis

In the Linux kernel prior to version 4.9.7, a vulnerability exists in the VideoCore DRM driver, specifically in the vc4_get_bcl function in drivers/gpu/drm/vc4/vc4_gem.c. This flaw allows local users to trigger a denial of service by providing inconsistent size values in a VC4_SUBMIT_CL ioctl call.

Understanding CVE-2017-5577

This CVE entry highlights a vulnerability in the Linux kernel's VideoCore DRM driver that can be exploited by local users to cause a denial of service.

What is CVE-2017-5577?

The vulnerability in the VideoCore DRM driver arises due to certain overflow detections failing to set an errno value. This oversight enables local users to exploit the flaw by supplying inconsistent size values in a specific ioctl call, leading to a denial of service through an incorrect pointer dereference and OOPS.

The Impact of CVE-2017-5577

The impact of this vulnerability is the potential for local users to disrupt system functionality and cause a denial of service by exploiting the flaw in the VideoCore DRM driver.

Technical Details of CVE-2017-5577

This section delves into the technical aspects of the CVE, providing insight into the vulnerability and its implications.

Vulnerability Description

The vc4_get_bcl function in drivers/gpu/drm/vc4/vc4_gem.c within the VideoCore DRM driver in the Linux kernel before version 4.9.7 fails to set an errno value during certain overflow detections. This oversight allows local users to trigger a denial of service by providing inconsistent size values in a specific ioctl call.

Affected Systems and Versions

Affected System: Linux kernel prior to version 4.9.7
Affected Component: VideoCore DRM driver

Exploitation Mechanism

The vulnerability can be exploited by local users who provide inconsistent size values in a VC4_SUBMIT_CL ioctl call, resulting in a denial of service through an incorrect pointer dereference and OOPS.

Mitigation and Prevention

To address and prevent the exploitation of CVE-2017-5577, the following steps can be taken:

Immediate Steps to Take

Apply relevant patches and updates to the Linux kernel to mitigate the vulnerability.
Monitor for any unusual system behavior that may indicate exploitation of the flaw.

Long-Term Security Practices

Regularly update the Linux kernel to the latest stable version to ensure all security patches are applied.
Implement the principle of least privilege to restrict user access and minimize the impact of potential vulnerabilities.

Patching and Updates

Ensure timely installation of security patches released by the Linux kernel maintainers to address the vulnerability and enhance system security.