CVE-2019-19965 : What You Need to Know
Learn about CVE-2019-19965, a vulnerability in the Linux kernel version 5.4.6 leading to a NULL pointer dereference in drivers/scsi/libsas/sas_discover.c. Find out the impact, affected systems, exploitation mechanism, and mitigation steps.
A vulnerability was found in the Linux kernel version 5.4.6, where a NULL pointer is incorrectly accessed in the file drivers/scsi/libsas/sas_discover.c. This issue arises due to improper handling of port disconnection during the discovery process, specifically related to a race condition known as PHY down. The Common Identifier (CID) for this vulnerability is f70267f379b5.
Understanding CVE-2019-19965
This CVE identifies a vulnerability in the Linux kernel that can lead to a NULL pointer dereference in a specific file due to mishandling of port disconnection during the discovery process.
What is CVE-2019-19965?
CVE-2019-19965 is a vulnerability in the Linux kernel through version 5.4.6, leading to a NULL pointer dereference in drivers/scsi/libsas/sas_discover.c.
The Impact of CVE-2019-19965
The vulnerability can be exploited to cause a denial of service (DoS) or potentially execute arbitrary code on the affected system, posing a significant risk to system integrity and availability.
Technical Details of CVE-2019-19965
This section provides detailed technical information about the vulnerability.
Vulnerability Description
The vulnerability in the Linux kernel through version 5.4.6 results in a NULL pointer dereference in drivers/scsi/libsas/sas_discover.c due to mishandling of port disconnection during the discovery process.
Affected Systems and Versions
- Affected System: Linux kernel through version 5.4.6
- Affected File: drivers/scsi/libsas/sas_discover.c
Exploitation Mechanism
The vulnerability is exploited by triggering the mishandling of port disconnection during the discovery process, specifically related to a race condition known as PHY down.
Mitigation and Prevention
Protecting systems from CVE-2019-19965 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Apply security patches provided by the Linux kernel maintainers promptly.
- 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 mitigate known vulnerabilities.
- Implement network segmentation and access controls to limit the impact of potential exploitation.
Patching and Updates
- Ensure timely installation of security updates released by the Linux kernel maintainers to address CVE-2019-19965.