CVE-2017-7346 Explained : Impact and Mitigation

In the Linux kernel version up to 4.10.7, a vulnerability exists in the vmw_gb_surface_define_ioctl function that could allow a local attacker to trigger a denial of service (system hang) through a carefully crafted ioctl call.

Understanding CVE-2017-7346

This CVE entry highlights a specific vulnerability in the Linux kernel that could be exploited by an attacker with local access.

What is CVE-2017-7346?

The function vmw_gb_surface_define_ioctl in drivers/gpu/drm/vmwgfx/vmwgfx_surface.c in the Linux kernel up to version 4.10.7 lacks proper validation of certain levels data, enabling a local user to cause a denial of service by executing a malicious ioctl call for a /dev/dri/renderD* device.

The Impact of CVE-2017-7346

The vulnerability could lead to a system hang, resulting in a denial of service condition for the affected device.

Technical Details of CVE-2017-7346

This section delves into the technical aspects of the CVE entry.

Vulnerability Description

The vmw_gb_surface_define_ioctl function in the Linux kernel through version 4.10.7 fails to validate specific levels data, allowing local users to trigger a denial of service attack.

Affected Systems and Versions

Affected System: Linux kernel up to version 4.10.7
Affected Component: vmw_gb_surface_define_ioctl function

Exploitation Mechanism

The vulnerability can be exploited by a local attacker with access to execute a carefully crafted ioctl call for a /dev/dri/renderD* device.

Mitigation and Prevention

To address CVE-2017-7346, follow these mitigation strategies:

Immediate Steps to Take

Apply relevant patches provided by the Linux kernel maintainers.
Monitor security advisories for updates and apply them promptly.

Long-Term Security Practices

Implement the principle of least privilege to restrict access rights.
Regularly review and update security configurations to enhance system resilience.

Patching and Updates

Stay informed about security patches released by the Linux kernel community.
Keep the system up to date with the latest security fixes and updates.