Vulnerability in Kernel: thermal: core: Fix TZ_GET_TRIP NULL pointer dereference
Summary
GSD-2022-1000778: thermal: core: Fix TZ_GET_TRIP NULL pointer dereference. Affects Kernel versions >= 1ce50e7d408ef2bdc8ca021363fd46d1b8bfad00, < 3dafbf915c05f83469e791949b5590da2aca2afb. No fix is published. How to fix ↓
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Background
The Kernel is a crucial component of the Linux operating system, responsible for managing system resources and facilitating communication between hardware and software. It provides essential functionalities such as process management, memory management, and device drivers. The thermal subsystem within the Kernel is responsible for monitoring and controlling the temperature of various components in the system. This vulnerability specifically affects the thermal core module, which is responsible for handling temperature zones and trips.
The vulnerability arises due to a NULL pointer dereference in the TZ_GET_TRIP function. This can be exploited by an attacker to cause a denial-of-service condition or potentially execute arbitrary code with kernel privileges. The vulnerability was introduced in version v5.9 of the Linux Kernel and has been fixed in version v5.15.27.
Vulnerability Detail
The vulnerability in the thermal core module of the Kernel arises from a NULL pointer dereference in the TZ_GET_TRIP function. When this function is called with an invalid trip ID, it fails to handle the NULL pointer correctly, leading to a kernel crash or potential code execution with elevated privileges. An attacker can exploit this vulnerability by sending specially crafted input to trigger the vulnerable code path.
The impact of this vulnerability can range from a denial-of-service condition, where the system becomes unresponsive or crashes, to arbitrary code execution with kernel privileges. Successful exploitation of this vulnerability could allow an attacker to gain control over the affected system and potentially escalate their privileges.
It is important to note that the actual 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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Conclusion
The vulnerability in the thermal core module of the Kernel, which results in a NULL pointer dereference in the TZ_GET_TRIP function, can have severe consequences ranging from a denial-of-service condition to arbitrary code execution with kernel privileges. It is crucial to update the Linux Kernel to version v5.15.27 or later to mitigate this vulnerability. Promptly applying security patches and updates is essential to ensure the security and stability of the system.
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FAQ
The impact of this vulnerability can range from a denial-of-service condition, where the system becomes unresponsive or crashes, to arbitrary code execution with kernel privileges. Successful exploitation of this vulnerability could allow an attacker to gain control over the affected system and potentially escalate their privileges.
You can use tools like Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Vulert Playground allows you to analyze your manifest file, such as package-lock.json, and provides real-time alerts for open-source vulnerabilities in the software.
There is no evidence to suggest that this vulnerability has been exploited in the wild. However, it is always recommended to apply security patches and updates promptly to mitigate potential risks.
At the moment, there are no known workarounds for this vulnerability. It is recommended to update the Linux Kernel to the fixed version as soon as possible.
The discovery of this vulnerability is credited to the Linux Kernel development team. The vulnerability was identified and fixed through the collaborative efforts of the open-source community.
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