CVE-2019-19065 : What You Need to Know

In the Linux kernel prior to version 5.3.9, a memory leak vulnerability exists in the sdma_init() function in drivers/infiniband/hw/hfi1/sdma.c. This issue, identified as CID-34b3be18a04e, has sparked controversy regarding its classification as a true vulnerability due to specific conditions required for exploitation.

Understanding CVE-2019-19065

This CVE involves a memory leak vulnerability in the Linux kernel that could potentially lead to a denial of service attack.

What is CVE-2019-19065?

The vulnerability in the sdma_init() function can result in a memory leak, potentially enabling attackers to trigger failures in rhashtable_init() and cause denial of service.

The Impact of CVE-2019-19065

The impact of this vulnerability is the potential for a denial of service attack by exploiting the memory leak in the Linux kernel.

Technical Details of CVE-2019-19065

This section provides technical details about the vulnerability.

Vulnerability Description

The memory leak in the sdma_init() function allows attackers to trigger failures in rhashtable_init(), potentially leading to a denial of service attack.

Affected Systems and Versions

Affected systems: Linux kernel versions prior to 5.3.9
Affected component: drivers/infiniband/hw/hfi1/sdma.c

Exploitation Mechanism

Attackers can exploit the vulnerability by corrupting kernel memory to trigger failures in rhashtable_init() from sdma_init().

Mitigation and Prevention

Protecting systems from CVE-2019-19065 requires immediate steps and long-term security practices.

Immediate Steps to Take

Update to Linux kernel version 5.3.9 or newer to mitigate the vulnerability.
Monitor system logs for any signs of memory leaks or denial of service attacks.

Long-Term Security Practices

Implement strict input validation to prevent the passing of invalid values to critical functions.
Regularly apply security patches and updates to the Linux kernel to address known vulnerabilities.
Conduct regular security audits to identify and address potential memory leak issues.
Employ memory protection mechanisms to safeguard against memory corruption attacks.

Patching and Updates

Stay informed about security advisories and updates from Linux kernel vendors.
Apply patches promptly to ensure systems are protected against known vulnerabilities.