Vulnerability in Kernel: isotp_sendmsg() Function
Summary
GSD-2021-1001886: can: isotp: isotp_sendmsg(): add result check for wait_event_interruptible(). Affects Kernel versions >= e057dd3fc20ffb3d7f150af46542a51b59b90127, < a76abedd2be3926d6deba236a935c7f98abf9110. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that provides core functionalities and acts as an interface between hardware and software. It manages system resources, facilitates communication between different software components, and ensures the overall stability and security of the system. One of the features provided by the Kernel is the Controller Area Network (CAN) subsystem, which enables communication between devices connected via the CAN bus. Within the CAN subsystem, the isotp_sendmsg() function is responsible for sending ISO-TP (ISO 15765-2) protocol messages. However, a vulnerability has been identified in this function that could potentially be exploited by attackers.
Vulnerability Detail
The vulnerability in the isotp_sendmsg() function arises from a missing result check for the wait_event_interruptible() call. This omission can lead to a race condition where a malicious actor could send specially crafted ISO-TP messages to trigger a deadlock or cause the system to hang. By exploiting this vulnerability, an attacker may be able to disrupt the normal operation of the system, leading to denial of service or potentially gaining unauthorized access to sensitive information. The vulnerability was introduced in Linux Kernel version 5.10 and has been fixed in version 5.14.15.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users can disable the affected functionality by unloading the relevant kernel module or disabling the CAN subsystem entirely. However, this may impact the functionality of devices relying on the CAN bus communication.
Conclusion
In conclusion, a vulnerability has been identified in the isotp_sendmsg() function of the Kernel's CAN subsystem. This vulnerability could potentially be exploited to cause a denial of service or gain unauthorized access. It is crucial to update the Linux Kernel to version 5.14.15 or later to mitigate this vulnerability. If you require further assistance or support in addressing this vulnerability, please contact DevNack.com.
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FAQ
The vulnerability can potentially lead to denial of service or unauthorized access to sensitive information.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your manifest file (e.g., package-lock.json) and Vulert will provide real-time alerts for open-source vulnerabilities.
At the time of this report, there is no known public exploit for this vulnerability. However, it is important to apply the fix as soon as possible to mitigate any potential risks.
As a temporary workaround, you can disable the affected functionality by unloading the relevant kernel module or disabling the CAN subsystem entirely. However, it is recommended to update the Kernel to the fixed version as soon as possible.
You can find more information about this vulnerability in the official Linux Kernel security advisory or by contacting the Linux Kernel development community.
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