NULL pointer dereference in qlcnic_83xx_add_rings() in Kernel

Sponsored Habilume Habit tracker with a companion that grows with you Complete habits, earn Lume Points, and watch your Lume grow as you stay consistent. App Store Google Play

Background

The Kernel is a crucial component of the Linux operating system that provides core functionality and acts as an interface between hardware and software. It manages system resources, facilitates communication between different software components, and ensures the overall stability and security of the system. The qlcnic driver in the Kernel is responsible for supporting QLogic network adapters.

The qlcnic_83xx_add_rings() function is a part of the qlcnic driver and is used to add rings for the QLogic network adapter. However, a vulnerability exists in this function that can lead to a NULL pointer dereference.

A NULL pointer dereference occurs when a program attempts to access or manipulate memory using a pointer that points to NULL (i.e., does not point to any valid memory location). This can result in a system crash or potentially allow an attacker to execute arbitrary code or trigger a denial-of-service (DoS) condition.

Vulnerability Detail

The vulnerability in qlcnic_83xx_add_rings() arises due to a lack of proper validation of input parameters. When certain conditions are met, a NULL pointer can be dereferenced, leading to a system crash or potential code execution.

An attacker may exploit this vulnerability by sending specially crafted network packets to a vulnerable system, causing the qlcnic driver to trigger the NULL pointer dereference. This can result in a denial-of-service (DoS) condition or potentially allow the attacker to execute arbitrary code with elevated privileges.

The vulnerability was introduced in version v3.9 of the Linux Kernel and has been fixed in version v5.10.84 by commit 15fa12c119f869173f9b710cbe6a4a14071d2105.

Workaround

As a workaround, users can consider disabling or blocking network traffic to the vulnerable system, especially from untrusted sources. This can help mitigate the risk of exploitation until the Kernel is updated or the patch is applied.

Here is an example of how to use iptables to block incoming traffic on a specific port (e.g., port 12345):

iptables -A INPUT -p tcp --dport 12345 -j DROP

Please note that this workaround may impact legitimate network communication, so it should be implemented with caution and reviewed based on the specific environment and requirements.

Conclusion

The NULL pointer dereference vulnerability in qlcnic_83xx_add_rings() in the Kernel can lead to system crashes, code execution, or denial-of-service (DoS) conditions. It is crucial to update the Linux Kernel to version v5.10.84 or later to mitigate this vulnerability. Alternatively, applying the specific patch can also address the issue. Implementing network traffic blocking as a temporary workaround can provide additional protection until the Kernel is updated or patched.

For further support and assistance in vulnerability remediation, please contact DevNack.com.

See every vulnerability recorded for Kernel →

FAQ