Memory Leak Vulnerability in ext4_fill_super in Kernel
Summary
GSD-2021-1001229: ext4: fix memory leak in ext4_fill_super. Affects Kernel versions >= ce40733ce93de402ed629762f0e912d9af187cef, < afd09b617db3786b6ef3dc43e28fe728cfea84df. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that provides core functionalities and acts as a bridge between hardware and software. It manages system resources, facilitates communication between different software components, and ensures the overall stability and security of the system. The ext4 file system is widely used in Linux and offers features such as improved performance, scalability, and reliability. However, a vulnerability has been discovered in the ext4_fill_super function, which can lead to a memory leak issue.
Vulnerability Detail
The memory leak vulnerability in ext4_fill_super arises from a flaw in the code implementation. When the function is called to mount an ext4 file system, it fails to release allocated memory in certain scenarios, resulting in a memory leak. An attacker could potentially exploit this vulnerability by mounting a specially crafted ext4 file system, leading to a gradual depletion of system memory resources. This could result in system instability, performance degradation, or even denial of service if the memory exhaustion reaches critical levels. The vulnerability was introduced in version v2.6.25 of the Linux Kernel and has been fixed in version v5.13.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users can avoid mounting untrusted or malicious ext4 file systems until the Kernel is updated to a fixed version. Additionally, monitoring system memory usage and promptly restarting the system if memory depletion is observed can help mitigate the impact of this vulnerability.
Conclusion
The memory leak vulnerability in ext4_fill_super poses a risk of memory depletion and system instability. It is crucial to update the Linux Kernel to version v5.13 or later to mitigate this vulnerability. By doing so, the ext4_fill_super function will properly release allocated memory, preventing memory leaks. For further support on vulnerability remediation, you can reach out to DevNack.com.
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FAQ
The vulnerability can lead to a gradual depletion of system memory resources, potentially causing system instability, performance degradation, or denial of service if memory exhaustion reaches critical levels.
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 any open-source vulnerabilities, including this memory leak vulnerability in ext4_fill_super.
There is no evidence of this vulnerability being exploited in the wild at the moment. However, it is crucial to apply the recommended fix or update the Kernel to mitigate any potential risks.
No, the vulnerability was introduced in version v2.6.25 of the Linux Kernel. Versions prior to v2.6.25 and versions from v5.13 onwards are not affected.
Apart from avoiding mounting untrusted or malicious ext4 file systems, there are no other known workarounds for this vulnerability. Updating the Kernel to a fixed version is the recommended solution.
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