Critical Vulnerability in Linux Kernel: Serial Port Locking Issue
Summary
DEBIAN-CVE-2024-38634: In the Linux kernel, the following vulnerability has been resolved: serial: max3100: Lock port->lock when calling uart_handle_cts_change() uart_handle_cts_change() has to be called with port lock taken, Since we run it i... Affects linux versions < 5.10.221-1. Fixed in 5.10.221-1. How to fix ↓
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Background
The Linux kernel is the core component of the Linux operating system, managing hardware and system resources. It provides essential services for all other parts of the system, including device drivers, system calls, and process management. The kernel is crucial for system stability and performance. This vulnerability affects the serial driver for the MAX3100 chip, which is used for serial communication in various devices. The issue arises from improper locking mechanisms when handling changes in the Clear to Send (CTS) signal, potentially leading to system instability.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the serial driver for the MAX3100 chip, specifically in the function uart_handle_cts_change(). This function must be called with the port lock taken to prevent race conditions. However, it is executed in a separate work queue, which may not have the lock taken at the time of execution. This oversight can lead to a system crash, as indicated by the warning message generated during operation. The vulnerability is critical as it can cause unexpected behavior in devices relying on the MAX3100 for serial communication.
How To Fix
Minimum fixed version
5.10.221-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade linuxTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
Currently, there are no specific workarounds mentioned for this vulnerability. The best course of action is to apply the available patches as soon as possible.
Conclusion
The vulnerability in the Linux kernel's serial driver for the MAX3100 chip poses a significant risk to system stability. It is crucial for users to update their systems to the patched versions to mitigate this risk. Regular monitoring for vulnerabilities is essential to ensure the security of your systems.
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FAQ
The vulnerability involves improper locking in the serial driver for the MAX3100 chip, which can lead to system crashes.
You can use the Vulert platform to monitor and alert for open-source vulnerabilities in your software without requiring code access. Visit Vulert Scanner to check if your application is affected.
Failure to address this vulnerability may result in system instability, crashes, and potential data loss in devices utilizing the MAX3100 for serial communication.
Yes, the vulnerability affects specific versions of the Linux kernel across Debian 11, 12, 13, and 14. Ensure you upgrade to the patched versions.
It is recommended to regularly check for vulnerabilities and apply updates promptly to maintain system security and stability.
References
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