net: tun: unlink NAPI from device on destruction
Summary
GSD-2022-1004446: net: tun: unlink NAPI from device on destruction. Affects Kernel versions >= 943170998b200190f99d3fe7e771437e2c51f319, < 8145f77d38de4f88b8a69e1463f5c09ba189d77c. No fix is published. How to fix ↓
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Background
The net package in the Linux Kernel is responsible for network communication and provides various network protocols, interfaces, and drivers. The tun driver is a virtual network device that allows user-space programs to interact with the network stack. It is commonly used for VPNs and other network-related applications. This vulnerability in the tun driver allows an attacker to unlink the NAPI (New API) from the device during destruction, potentially leading to a use-after-free vulnerability.
Vulnerability Detail
The vulnerability arises from the failure to properly unlink the NAPI from the tun device when it is being destroyed. This can result in a use-after-free scenario where an attacker can exploit the freed memory to execute arbitrary code or cause a denial-of-service condition. The impact and attack plausibility of this vulnerability have not been proven yet. The vulnerability was introduced in version v4.15 of the Linux Kernel and has been fixed in version v5.15.53.
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 net package in the Linux Kernel, specifically the tun driver, is vulnerable to a use-after-free vulnerability due to the improper unlinking of NAPI during device destruction. This vulnerability can be mitigated by updating the Linux Kernel to version v5.15.53 or later. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The net package in the Linux Kernel is responsible for network communication and provides various network protocols, interfaces, and drivers.
The tun driver is a virtual network device that allows user-space programs to interact with the network stack. It is commonly used for VPNs and other network-related applications.
NAPI (New API) is a mechanism in the Linux Kernel that provides efficient packet reception for network devices.
A use-after-free vulnerability occurs when a program continues to use a memory region after it has been freed, potentially leading to memory corruption and arbitrary code execution.
To fix this vulnerability, you should update your Linux Kernel to version v5.15.53 or later.
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