Memory Leak in ldisc_open in Kernel
Summary
UVI-2021-1001125: net: caif: fix memory leak in ldisc_open. Affects Kernel versions < 18ed1789bbce54f34367877344e35d9bb877f8f4. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that manages system resources and facilitates communication between hardware and software. It provides essential functionalities such as process management, memory management, and device drivers. The ldisc_open function in the Kernel's networking subsystem, specifically in the caif (Common API for Interfacing with the Fabric) module, is responsible for opening a line discipline. A line discipline is a software layer that processes data streams between the network interface and user applications. This vulnerability affects the Kernel's ldisc_open function and can lead to a memory leak.
Vulnerability Detail
The vulnerability in ldisc_open function in the Kernel's caif module results in a memory leak. When a line discipline is opened, memory is allocated to handle the data streams. However, due to a flaw in the code, this memory is not properly deallocated when the line discipline is closed. As a result, repeated opening and closing of line disciplines can exhaust system memory resources, leading to performance degradation or even system instability. An attacker could potentially exploit this vulnerability to cause a denial-of-service (DoS) condition by repeatedly opening and closing line disciplines.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no known workaround for this vulnerability. It is recommended to apply the fix by updating the Linux Kernel to the patched version.
Conclusion
The memory leak vulnerability in ldisc_open function in the Kernel's caif module can have significant consequences on system performance and stability. It is crucial to update the Linux Kernel to the patched version to mitigate this vulnerability. For further support on vulnerability remediation, you can contact DevNack.com.
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FAQ
The vulnerability can result in a memory leak, leading to performance degradation or system instability. An attacker could potentially exploit this vulnerability to cause a denial-of-service (DoS) condition.
You can use tools like Vulert (https://vulert.com) to check if your system is affected by this vulnerability. Vulert uses a manifest file like package-lock.json to monitor and alert in real-time for open-source vulnerabilities in the software.
At the time of this report, there is no known exploit for this vulnerability. However, it is important to apply the fix to prevent potential exploitation.
No, the recommended mitigation is to update the Linux Kernel to the patched version. There is no known workaround for this vulnerability.
You can refer to the Linux Kernel's Git repository at https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ for more information about the fix and the vulnerability. The specific commit addressing this issue is 18ed1789bbce54f34367877344e35d9bb877f8f4.
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