net: tun: unlink NAPI from device on destruction

Kernel Updated 02 Oct 2025

Summary

31/07/2022

Disclosed on

N/A

Severity

No i

Fix available

Unrated

Severity

Not published

CVSS Score

GSD-2022-1004727: net: tun: unlink NAPI from device on destruction. Affects Kernel versions >= 943170998b200190f99d3fe7e771437e2c51f319, < a8cf919022373c97a84fe596bbea544f909c485d. No fix is published. How to fix ↓

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Background

The Linux Kernel is an open-source monolithic Unix-like computer operating system kernel. It provides the essential services to enable the execution of software on a computer. The net module in the Linux Kernel is responsible for network-related functionality, including network device drivers. The tun driver is a software-only network device that allows user-space programs to interact with network traffic. This vulnerability affects the tun driver in the Linux Kernel.

Vulnerability Detail

The vulnerability in the tun driver arises from the failure to unlink NAPI (New API) from the device during destruction. NAPI is a mechanism in the Linux Kernel that improves network performance by reducing CPU overhead. By not properly unlinking NAPI from the device, an attacker may be able to exploit this vulnerability to gain unauthorized access or execute arbitrary code. The impact and attack plausibility of this vulnerability have not been proven.

How To Fix

No fixed version is published for this vulnerability.

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Workaround

There is no specific workaround mentioned for this vulnerability.

Conclusion

The vulnerability in the tun driver of the Linux Kernel allows for potential unauthorized access or arbitrary code execution. It is recommended to update the kernel to version v5.4.204 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.

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