CVE-2019-12381 Explained : Impact and Mitigation

A vulnerability was identified in ip_ra_control in the net/ipv4/ip_sockglue.c file within the Linux kernel up to version 5.1.5. The unchecked kmalloc operation for new_ra could potentially lead to a denial of service vulnerability, resulting in a NULL pointer dereference and system crash. This claim is disputed as new_ra is not utilized if it is NULL.

Understanding CVE-2019-12381

This CVE involves a vulnerability in the Linux kernel that could be exploited for a denial of service attack.

What is CVE-2019-12381?

The vulnerability in ip_ra_control in the Linux kernel up to version 5.1.5 allows for a potential denial of service attack due to an unchecked kmalloc operation for new_ra.

The Impact of CVE-2019-12381

The exploitation of this vulnerability could result in a system crash due to a NULL pointer dereference, potentially leading to a denial of service.

Technical Details of CVE-2019-12381

This section provides more technical insights into the vulnerability.

Vulnerability Description

The vulnerability lies in the unchecked kmalloc operation for new_ra in the net/ipv4/ip_sockglue.c file within the Linux kernel up to version 5.1.5.

Affected Systems and Versions

Affected system: Linux kernel up to version 5.1.5
Affected component: ip_ra_control in net/ipv4/ip_sockglue.c

Exploitation Mechanism

Exploiting the unchecked kmalloc operation for new_ra
Potential for a denial of service attack

Mitigation and Prevention

Protecting systems from the CVE-2019-12381 vulnerability is crucial.

Immediate Steps to Take

Monitor for security advisories and patches from Linux kernel maintainers
Apply relevant security updates promptly

Long-Term Security Practices

Regularly update the Linux kernel to the latest stable version
Implement proper access controls and network segmentation to reduce attack surface

Patching and Updates

Stay informed about security patches released by the Linux kernel community
Apply patches promptly to mitigate the risk of exploitation