CVE-2017-7261 Explained : Impact and Mitigation
Learn about CVE-2017-7261, a vulnerability in the Linux kernel up to version 4.10.5 that allows local attackers to trigger a denial of service situation. Find out how to mitigate and prevent this issue.
In the Linux kernel up to version 4.10.5, a vulnerability exists in the vmw_surface_define_ioctl function that can be exploited by a local attacker, potentially leading to a denial of service situation.
Understanding CVE-2017-7261
This CVE entry describes a flaw in the Linux kernel that allows for a specific type of attack resulting in a general protection fault (GPF) and potentially triggering a panic.
What is CVE-2017-7261?
The vulnerability in the vmw_surface_define_ioctl function in the Linux kernel up to version 4.10.5 allows a local attacker to exploit the flaw by making a specially crafted ioctl call to a /dev/dri/renderD* device.
The Impact of CVE-2017-7261
The exploitation of this vulnerability can lead to a denial of service situation due to a ZERO_SIZE_PTR dereference, resulting in a general protection fault (GPF) and potentially triggering a panic.
Technical Details of CVE-2017-7261
This section provides more detailed technical information about the vulnerability.
Vulnerability Description
The vmw_surface_define_ioctl function in drivers/gpu/drm/vmwgfx/vmwgfx_surface.c in the Linux kernel through 4.10.5 does not check for a zero value of certain levels data, allowing local users to cause a denial of service.
Affected Systems and Versions
- Affected System: Linux kernel up to version 4.10.5
- Affected Function: vmw_surface_define_ioctl
Exploitation Mechanism
- Attack Vector: Local
- Attack Complexity: Low
- Privileges Required: None
Mitigation and Prevention
To address CVE-2017-7261, the following steps can be taken:
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
- Regularly update the Linux kernel to the latest stable version.
- Implement proper access controls to limit the impact of potential vulnerabilities.
Patching and Updates
- Stay informed about security updates for the Linux kernel.
- Regularly check for patches and apply them to ensure system security.