CVE-2017-18203 : Security Advisory and Response
Learn about CVE-2017-18203, a Linux kernel vulnerability allowing local users to trigger a denial of service attack by exploiting a race condition. Find mitigation steps and update recommendations here.
In the Linux kernel prior to version 4.14.3, a vulnerability exists in the dm_get_from_kobject function in drivers/md/dm.c. This flaw can be exploited by local users to cause a denial of service (BUG) by leveraging a race condition during the creation and removal of DM devices.
Understanding CVE-2017-18203
This CVE identifies a vulnerability in the Linux kernel that allows local users to trigger a denial of service attack.
What is CVE-2017-18203?
The vulnerability in the dm_get_from_kobject function in the Linux kernel before version 4.14.3 enables local users to exploit a race condition, leading to a denial of service by triggering a BUG.
The Impact of CVE-2017-18203
The exploitation of this vulnerability can result in a denial of service attack, potentially disrupting system operations and causing instability.
Technical Details of CVE-2017-18203
This section provides technical insights into the vulnerability.
Vulnerability Description
The dm_get_from_kobject function in drivers/md/dm.c in the Linux kernel before 4.14.3 allows local users to cause a denial of service (BUG) by exploiting a race condition with __dm_destroy during the creation and removal of DM devices.
Affected Systems and Versions
- Affected systems: Linux kernel versions prior to 4.14.3
- Affected component: dm_get_from_kobject function in drivers/md/dm.c
Exploitation Mechanism
The vulnerability can be exploited by local users through a race condition that occurs during the creation and removal of DM devices, specifically with the __dm_destroy function.
Mitigation and Prevention
Protecting systems from CVE-2017-18203 requires specific actions.
Immediate Steps to Take
- Update the Linux kernel to version 4.14.3 or later to address the vulnerability.
Long-Term Security Practices
- Regularly monitor and apply security updates to the Linux kernel and related components.
- Implement least privilege access controls to limit the impact of potential vulnerabilities.
Patching and Updates
- Stay informed about security advisories and patches released by Linux distributions and the kernel development team.