CVE-2017-8063 : Security Advisory and Response

This CVE involves a mishandling issue in the Linux kernel versions 4.9.x and 4.10.x before 4.10.12, specifically in the cxusb.c file. The vulnerability can be exploited by local users, potentially leading to a system crash and other unspecified impacts.

Understanding CVE-2017-8063

What is CVE-2017-8063?

The vulnerability in the Linux kernel arises due to incorrect interaction with the CONFIG_VMAP_STACK option, allowing local users to cause a denial of service or other impacts by using multiple virtual pages for a DMA scatterlist.

The Impact of CVE-2017-8063

The exploitation of this vulnerability can result in a system crash and potentially lead to additional impacts that are not clearly defined.

Technical Details of CVE-2017-8063

Vulnerability Description

The issue occurs in the cxusb.c file within the drivers/media/usb/dvb-usb/ directory of Linux kernel versions 4.9.x and 4.10.x before 4.10.12, due to incorrect interaction with the CONFIG_VMAP_STACK option.

Affected Systems and Versions

Affected versions: 4.9.x and 4.10.x before 4.10.12
Systems using the CONFIG_VMAP_STACK option

Exploitation Mechanism

Local users can exploit the vulnerability by utilizing multiple virtual pages for a DMA scatterlist

Mitigation and Prevention

Immediate Steps to Take

Apply the necessary 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 the principle of least privilege to restrict user access

Patching and Updates

Ensure timely installation of security patches and updates released by the Linux kernel maintainers