CVE-2018-20856 Explained : Impact and Mitigation
Learn about CVE-2018-20856, a use-after-free vulnerability in the Linux kernel before version 4.18.7. Understand the impact, technical details, affected systems, and mitigation steps.
A problem was found in the Linux kernel before version 4.18.7. The issue involves a use-after-free vulnerability in the file block/blk-core.c, specifically due to mishandling of a specific error condition.
Understanding CVE-2018-20856
This CVE identifier pertains to a vulnerability in the Linux kernel that could potentially be exploited by attackers.
What is CVE-2018-20856?
CVE-2018-20856 is a use-after-free vulnerability in the Linux kernel before version 4.18.7, specifically in the block/blk-core.c file. This flaw arises from the mishandling of a particular error scenario.
The Impact of CVE-2018-20856
The exploitation of this vulnerability could allow an attacker to execute arbitrary code or cause a denial of service (DoS) condition on the affected system.
Technical Details of CVE-2018-20856
This section delves into the technical aspects of the CVE, including the vulnerability description, affected systems, and exploitation mechanism.
Vulnerability Description
The issue in the Linux kernel before version 4.18.7 involves a use-after-free vulnerability in the __blk_drain_queue() function within the block/blk-core.c file.
Affected Systems and Versions
- Product: Not applicable
- Vendor: Not applicable
- Versions affected: Not applicable
Exploitation Mechanism
The vulnerability can be exploited by triggering the mishandling of a specific error condition in the block/blk-core.c file, leading to the use-after-free scenario.
Mitigation and Prevention
In this section, we discuss the steps to mitigate the CVE-2018-20856 vulnerability and prevent potential exploitation.
Immediate Steps to Take
- Apply the necessary security patches provided by the Linux kernel maintainers.
- Monitor official sources for updates and advisories related to this vulnerability.
Long-Term Security Practices
- Regularly update the Linux kernel to the latest stable version to ensure all security patches are applied.
- Implement proper security measures and best practices to safeguard systems from potential attacks.
Patching and Updates
- Keep the Linux kernel up to date with the latest security patches and fixes to address known vulnerabilities.