Vulnerability in Kernel: Bluetooth hci_uart
Summary
GSD-2022-1001829: Bluetooth: hci_uart: add missing NULL check in h5_enqueue. Affects Kernel versions >= d9dd833cf6d29695682ec7e7924c0d0992b906bc, < 7235485433d290367d60ae22fcdfc565e61d42ab. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that acts as a bridge between hardware and software. It provides essential functionality and services to enable the proper functioning of the system. The Bluetooth hci_uart module within the Kernel facilitates communication between Bluetooth devices and the host system. It is responsible for handling Bluetooth HCI (Host Controller Interface) commands and events. This vulnerability, identified as GSD-2022-1001829, affects the hci_uart module and could potentially lead to security issues.
Vulnerability Detail
The vulnerability in the Bluetooth hci_uart module arises from a missing NULL check in the h5_enqueue function. This flaw can be exploited by an attacker to trigger a NULL pointer dereference, resulting in a kernel crash or potential code execution. The impact and attack plausibility of this vulnerability have not been proven yet, but it is crucial to address it to ensure the security and stability of the system. The vulnerability was introduced in Linux Kernel version v5.15 and has been fixed in version v5.15.33 by commit 7235485433d290367d60ae22fcdfc565e61d42ab.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users can disable the Bluetooth functionality or unload the hci_uart module if it is not required for their system. This can be achieved by executing the following commands:
# Disable Bluetooth
sudo systemctl disable bluetooth
# Unload hci_uart module
sudo modprobe -r hci_uart
However, it is strongly recommended to apply the official fix by updating the Kernel to ensure the long-term security of the system.
Conclusion
The vulnerability in the Bluetooth hci_uart module of the Kernel can lead to a kernel crash or potential code execution. It is crucial to update the Linux Kernel to version v5.15.33 or later to address this vulnerability. Users can also temporarily disable Bluetooth or unload the hci_uart module as a workaround. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The impact of this vulnerability is not yet proven, but it could potentially lead to a kernel crash or code execution, which may result in a denial of service or unauthorized access to the system.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your package-lock.json file to the playground, and it will provide real-time alerts for open-source vulnerabilities, including this one.
Yes, a temporary workaround is to disable the Bluetooth functionality or unload the hci_uart module if it is not required for your system. However, it is recommended to apply the official fix by updating the Kernel to ensure long-term security.
The official fix for this vulnerability is included in Linux Kernel version v5.15.33 or later. Users can obtain the updated Kernel from the official Linux Kernel repository.
At the time of this report, there are no known exploits for this vulnerability. However, it is important to address it promptly to mitigate any potential risks.
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