Vulnerability in hamradio: defer ax25 kfree after unregister_netdev
Summary
GSD-2021-1002789: hamradio: defer ax25 kfree after unregister_netdev. Affects Kernel versions < 896193a02a2981e60c40d4614fd095ce92135ccd. No fix is published. How to fix ↓
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Background
The hamradio package is a component of the Linux Kernel, which is responsible for handling Amateur Radio (ham radio) protocols. It provides support for various radio communication protocols and interfaces. The ax25 module within the hamradio package is specifically designed for handling AX.25 (Amateur X.25) network protocol, which is commonly used in amateur radio packet radio networks. This vulnerability affects the ax25 module in the hamradio package.
Vulnerability Detail
The vulnerability in the ax25 module of the hamradio package arises from a memory management issue. Specifically, the module does not properly handle memory deallocation after unregistering the network device. This can lead to a use-after-free condition, where a reference to freed memory is still accessible, potentially leading to a variety of security issues. The impact and attack plausibility of this vulnerability have not been proven yet.
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. The recommended approach is to update the Linux Kernel to the fixed version.
Conclusion
The vulnerability in the ax25 module of the hamradio package can potentially lead to security issues due to improper memory deallocation. It is crucial to update the Linux Kernel to the fixed version to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The hamradio package is a component of the Linux Kernel that provides support for Amateur Radio (ham radio) protocols and interfaces.
The ax25 module is a part of the hamradio package that handles the AX.25 (Amateur X.25) network protocol commonly used in amateur radio packet radio networks.
A use-after-free vulnerability occurs when a program continues to use a memory reference after it has been freed. This can lead to various security issues.
To fix this vulnerability, update the Linux Kernel to version v4.19.223 or later, which includes the necessary fix for the ax25 module.
No specific workaround is mentioned for this vulnerability. Updating the Linux Kernel to the fixed version is the recommended approach.
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