Memory Leak Vulnerability in Linux Kernel - CVE-2021-47655
Summary
CVE-2021-47655: In the Linux kernel, the following vulnerability has been resolved: media: venus: vdec: fixed possible memory leak issue The venus_helper_alloc_dpb_bufs() implementation allows an early return on an error path when check... Affects linux versions < 5.17.3-1. Fixed in 5.17.3-1. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, responsible for managing hardware and system resources. It provides essential services for all other parts of the operating system, including process management, memory management, and device control. The kernel is highly modular, allowing for various functionalities to be added or removed as needed. However, like any complex software, it is susceptible to vulnerabilities that can affect system stability and security.
Vulnerability Detail
CVE-2021-47655 is a vulnerability in the Linux kernel's media subsystem, specifically within the Venus video decoder. The issue arises from the venus_helper_alloc_dpb_bufs() function, which can lead to a memory leak if an error occurs during buffer allocation. If the function encounters an error after allocating memory but before it can free that memory, it results in a resource leak. This vulnerability could potentially lead to increased memory usage and system instability, as the leaked memory is not reclaimed, ultimately affecting performance and reliability.
How To Fix
Minimum fixed version
5.17.3-1
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 patch as soon as it becomes available.
Conclusion
CVE-2021-47655 is a significant vulnerability in the Linux kernel that can lead to memory leaks, affecting system performance and stability. It is essential to update to the latest patched version to mitigate this risk. Regular monitoring and prompt updates are vital for maintaining system security.
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FAQ
CVE-2021-47655 is a vulnerability in the Linux kernel that can lead to a memory leak in the Venus video decoder.
This vulnerability can lead to increased memory usage and potential system instability due to unreleased memory allocations.
If you are using a version of the Linux kernel prior to 5.17.3-1, your system may be vulnerable to this issue.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without requiring any installation.
While there are no specific workarounds, it is crucial to monitor your system for unusual behavior and plan to apply the patch as soon as possible.
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