Memory Leak in caif_device_notify in Kernel
Summary
UVI-2021-1000713: net: caif: fix memory leak in caif_device_notify. Affects Kernel versions >= 7c18d2205ea76eef9674e59e1ecae4f332a53e9e, < b042e2b2039565eb8f0eb51c14fbe1ef463c8cd8. 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 provides an interface for software to interact with hardware. It is responsible for tasks such as process management, memory management, and device drivers. The caif_device_notify function in the Kernel's networking subsystem is vulnerable to a memory leak. This function is used to notify the CAIF (Common Asynchronous Interface Framework) layer about device events. A memory leak occurs when memory is allocated but not properly deallocated, leading to a gradual depletion of available memory.
Vulnerability Detail
The vulnerability in caif_device_notify allows an attacker to trigger a memory leak by repeatedly sending device events. This can result in a gradual increase in memory usage, potentially leading to resource exhaustion and system instability. The vulnerability was introduced in version v3.3 of the Linux Kernel and was fixed in version v4.4.272. The impact and attack plausibility of this vulnerability have not been proven.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
If updating the Kernel is not immediately feasible, a temporary workaround can be implemented by restarting the affected system periodically to free up the leaked memory. However, this is not a permanent solution and should be followed by updating the Kernel as soon as possible.
Conclusion
The memory leak vulnerability in caif_device_notify can be addressed by updating the Linux Kernel to version v4.4.272 or later. It is recommended to apply the fix as soon as possible to prevent resource exhaustion and system instability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability can lead to a gradual increase in memory usage, potentially causing resource exhaustion and system instability.
An attacker can exploit this vulnerability by repeatedly sending device events to trigger the memory leak, gradually depleting available memory resources.
There is no evidence of this vulnerability being actively exploited in the wild at this time.
The vulnerability was introduced in version v3.3 of the Linux Kernel and was fixed in version v4.4.272. Versions within this range are potentially affected.
Apart from updating the Kernel, implementing strict memory management practices and monitoring system resources can help detect and mitigate the impact of memory leaks.
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