CVE-2019-19076 Explained : Impact and Mitigation

A memory leakage issue in the nfp_abm_u32_knode_replace() function in the Linux kernel versions prior to 5.3.6 has been identified. This vulnerability could lead to a denial-of-service attack due to excessive memory consumption. It is important to note that there is a dispute regarding the validity of this vulnerability, resulting in the withdrawal of the previously implemented fix.

Understanding CVE-2019-19076

This CVE involves a memory leakage issue in a specific function within the Linux kernel, potentially leading to a denial-of-service attack.

What is CVE-2019-19076?

The vulnerability lies in the nfp_abm_u32_knode_replace() function in the Linux kernel versions before 5.3.6. Attackers could exploit this flaw to trigger a denial-of-service attack by causing excessive memory consumption.

The Impact of CVE-2019-19076

The exploitation of this vulnerability could result in a denial-of-service condition due to the excessive consumption of system memory. However, the validity of this vulnerability has been disputed.

Technical Details of CVE-2019-19076

This section provides technical details about the vulnerability.

Vulnerability Description

The memory leakage issue in the nfp_abm_u32_knode_replace() function in the Linux kernel versions prior to 5.3.6 allows attackers to trigger a denial-of-service attack through excessive memory consumption.

Affected Systems and Versions

Affected System: Linux kernel versions before 5.3.6
Affected Function: nfp_abm_u32_knode_replace() in drivers/net/ethernet/netronome/nfp/abm/cls.c

Exploitation Mechanism

Attackers can exploit this vulnerability by manipulating the nfp_abm_u32_knode_replace() function to cause a denial-of-service attack.

Mitigation and Prevention

To address CVE-2019-19076, follow these mitigation strategies:

Immediate Steps to Take

Monitor system memory consumption regularly
Apply patches and updates provided by the Linux kernel maintainers

Long-Term Security Practices

Implement secure coding practices to prevent memory leakage vulnerabilities
Conduct regular security audits and assessments to identify and address potential vulnerabilities

Patching and Updates

Update to Linux kernel version 5.3.6 or later to mitigate the vulnerability
Stay informed about security advisories and updates from the Linux kernel community