CVE-2019-19055 : What You Need to Know

The Linux kernel version 5.3.11 has a memory leak vulnerability in the nl80211_get_ftm_responder_stats() function, potentially leading to a denial of service attack.

Understanding CVE-2019-19055

This CVE involves a memory leak issue in the Linux kernel version 5.3.11, specifically in the nl80211_get_ftm_responder_stats() function.

What is CVE-2019-19055?

The vulnerability allows attackers to trigger failures in the nl80211hdr_put() function, causing a denial of service by consuming excessive memory.

The Impact of CVE-2019-19055

Attackers can exploit this vulnerability to disrupt system functionality and potentially crash the affected system.
Some third parties argue against the severity of this issue, as it occurs in a specific code pathway where a successful allocation has already taken place.

Technical Details of CVE-2019-19055

This section provides more in-depth technical insights into the vulnerability.

Vulnerability Description

The memory leak in nl80211_get_ftm_responder_stats() in the Linux kernel through version 5.3.11 allows attackers to cause a denial of service by triggering failures in nl80211hdr_put().

Affected Systems and Versions

Affected System: Linux kernel version 5.3.11
Affected Function: nl80211_get_ftm_responder_stats()

Exploitation Mechanism

Attackers exploit the vulnerability by triggering failures in the nl80211hdr_put() function, leading to memory consumption and a denial of service condition.

Mitigation and Prevention

To address CVE-2019-19055 and enhance system security, consider the following mitigation strategies:

Immediate Steps to Take

Monitor system resources for unusual memory consumption patterns.
Apply patches or updates provided by the Linux kernel maintainers.

Long-Term Security Practices

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

Patching and Updates

Stay informed about security advisories and patches released by Linux kernel vendors.
Apply security updates promptly to protect systems from potential exploits.