Memory Leak Vulnerability in Linux Kernel
Summary
GSD-2021-1002111: mm, slub: fix potential memoryleak in kmem_cache_open(). Affects Kernel versions >= 210e7a43fa905bccafa9bb5966fba1d71f33eb8b, < 42b81946e3ac9ea0372ba16e05160dc11e02694f. 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 functionalities. It is widely used in various devices, including servers, desktops, and embedded systems. The mm (memory management) subsystem in the Linux Kernel handles memory allocation and deallocation. One of the key components of the mm subsystem is the slub allocator, which manages kernel object caches. However, a vulnerability has been discovered in the slub allocator that can lead to potential memory leaks.
Vulnerability Detail
The vulnerability, identified as GSD-2021-1002111, exists in the kmem_cache_open() function of the slub allocator in the Linux Kernel. When a cache is opened, there is a potential memory leak due to a missing error handling path. This can result in the consumption of excessive memory resources, leading to performance degradation or even denial of service conditions. The vulnerability was introduced in version v4.8 of the Linux Kernel and has been fixed in version v5.14.15.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can mitigate the risk of memory leaks by avoiding the usage of the kmem_cache_open() function in their applications or by implementing proper error handling and resource cleanup mechanisms within their code. Here is an example of how to handle errors and free allocated resources:
struct kmem_cache *cache = kmem_cache_create(...);
if (!cache) {
// Handle error and free resources
...
}
// Use the cache
...
// Cleanup and destroy the cache
kmem_cache_destroy(cache);
Conclusion
The memory leak vulnerability in the Linux Kernel's slub allocator can lead to excessive memory consumption and performance degradation. It is crucial to update the kernel to version v5.14.15 or later to mitigate this vulnerability. Alternatively, users can implement the provided workaround or consult with security experts for further guidance. For additional support on vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability can lead to memory leaks, which can result in excessive memory consumption, performance degradation, or denial of service conditions.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your package-lock.json file, and Vulert will analyze it in real-time.
At the time of this report, there is no known public exploit for this vulnerability. However, it is advisable to apply the recommended fix to ensure system security.
As a temporary measure, you can avoid using the kmem_cache_open() function in your applications or implement proper error handling and resource cleanup mechanisms within your code.
There may be other vulnerabilities in the Linux Kernel that are unrelated to this specific issue. It is recommended to regularly update the kernel and stay informed about security advisories to mitigate potential risks.
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