Integer Overflow in prealloc_elems_and_freelist() in Kernel
Summary
GSD-2021-1001630: bpf: Fix integer overflow in prealloc_elems_and_freelist(). Affects Kernel versions >= 557c0c6e7df8e14a46bd7560d193fa5bbc00a858, < 064faa8e8a9b50f5010c5aa5740e06d477677a89. 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 interfaces between hardware and software. It manages system resources, facilitates communication between different software components, and ensures the security and stability of the system. The prealloc_elems_and_freelist() function is a part of the Berkeley Packet Filter (BPF) subsystem in the Kernel. BPF is a virtual machine in the Kernel that allows user-defined programs to run in a safe and efficient manner. The prealloc_elems_and_freelist() function is responsible for allocating memory for BPF maps and maintaining a freelist of available elements. However, a vulnerability in this function can lead to an integer overflow, potentially resulting in memory corruption or other security issues.
Vulnerability Detail
The vulnerability in prealloc_elems_and_freelist() arises due to an integer overflow. When calculating the number of elements to preallocate for a BPF map, the function multiplies the requested number of elements by a constant factor. However, if the requested number of elements is large enough, the multiplication can result in an integer overflow. This can lead to insufficient memory allocation, memory corruption, or other unexpected behavior. An attacker may be able to exploit this vulnerability to execute arbitrary code, escalate privileges, or cause a denial-of-service condition. The impact and attack plausibility of this vulnerability have not been proven yet.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround mentioned for this vulnerability. Users are advised to update their Kernel to the latest version as soon as possible.
Conclusion
The vulnerability in prealloc_elems_and_freelist() in the Kernel can lead to memory corruption or other security issues. It is crucial to update the Kernel to the latest version to fix this vulnerability and ensure the security and stability of the system. For further support on vulnerability remediation, you can reach out to DevNack.com.
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FAQ
The impact of this vulnerability can vary depending on the specific system and its configuration. It could potentially allow an attacker to execute arbitrary code, escalate privileges, or cause a denial-of-service condition.
You can use tools like Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Vulert Playground allows you to analyze your manifest file, such as package-lock.json, and provides real-time alerts for open-source vulnerabilities.
As of now, there is no known exploit for this vulnerability. However, it is always recommended to apply security patches and updates to mitigate the risk of potential exploits.
The vulnerability was introduced in version v4.6 of the Kernel by commit 557c0c6e7df8e14a46bd7560d193fa5bbc00a858. It has been fixed in version v5.10.73 by commit 064faa8e8a9b50f5010c5aa5740e06d477677a89. Therefore, versions between v4.6 and v5.10.73 are potentially affected.
If you are unable to update your Kernel immediately, it is recommended to apply other security measures such as network segmentation, access controls, and monitoring to mitigate the risk of exploitation.
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