Memory Leak Vulnerability in Linux Kernel
Summary
GSD-2021-1001838: mm, slub: fix potential memoryleak in kmem_cache_open(). Affects Kernel versions >= 210e7a43fa905bccafa9bb5966fba1d71f33eb8b, < 568f906340b43120abd6fcc67c37396482f85930. No fix is published. How to fix ↓
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Background
The Linux Kernel is the core component of the Linux operating system, responsible for managing system resources and providing essential functionality. It is a critical piece of software that interacts directly with hardware and enables the execution of user applications. The mm (memory management) subsystem in the Linux Kernel handles memory allocation and management. One of the key components of the mm subsystem is the slub allocator, which is responsible for managing kernel object caches. These caches improve performance by reducing the overhead of memory allocation and deallocation. However, a vulnerability has been discovered in the slub allocator that can lead to a memory leak.
Vulnerability Detail
The vulnerability, identified as GSD-2021-1001838, exists in the kmem_cache_open() function of the slub allocator in the Linux Kernel. When a cache is opened, the function allocates memory for the cache's data structures. However, under certain conditions, if the allocation fails, the function fails to free the previously allocated memory, resulting in a memory leak. This can lead to a gradual depletion of system memory, potentially causing performance degradation or even system instability. The vulnerability was introduced in version v4.8 of the Linux Kernel and has been fixed in version v5.10.76.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As this vulnerability has been fixed in the latest version of the Linux Kernel, there is no specific workaround available. It is strongly advised to update to the patched version to mitigate the risk of memory leaks.
Conclusion
The memory leak vulnerability in the Linux Kernel's slub allocator can lead to a gradual depletion of system memory, potentially causing performance degradation and system instability. To mitigate this risk, it is crucial to update the Linux Kernel to version v5.10.76 or later. By doing so, the kmem_cache_open() function will properly handle memory allocation failures and prevent memory leaks. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability can lead to a memory leak in the Linux Kernel, resulting in a gradual depletion of system memory. This can cause performance degradation and potentially lead to system instability.
You can use the Vulert Playground at Vulert Scanner to check if your system is affected by this vulnerability. Simply upload your package-lock.json file, and Vulert will analyze it for open-source vulnerabilities, including this memory leak vulnerability in the Linux Kernel.
At the time of this report, there is no known exploit for this vulnerability. However, it is important to promptly update the Linux Kernel to the patched version to mitigate the risk.
This vulnerability does not have a direct remote exploitation vector. However, if an attacker gains control over a system running an outdated version of the Linux Kernel with this vulnerability, they may be able to leverage it for further attacks.
If updating the Linux Kernel is not immediately feasible, it is recommended to implement other security measures such as network segmentation, access controls, and monitoring to reduce the risk of exploitation.
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