Overflow Vulnerability in seq_buf_putmem_hex() in Kernel
Summary
UVI-2021-1001351: seq_buf: Fix overflow in seq_buf_putmem_hex(). Affects Kernel versions >= 5e3ca0ec76fce92daa4eed0d02de9c79b1fe3920, < 33ab9138a13e379cf1c4ccd76b97ae2ee8c5421b. No fix is published. How to fix ↓
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Background
The Kernel is a fundamental component of the Linux operating system that provides core functionalities and acts as an interface between hardware and software. It manages system resources, facilitates communication between different software components, and enables the execution of user programs. The seq_buf_putmem_hex() function is a part of the seq_buf API in the Kernel, which is used for sequential buffer handling. This vulnerability specifically affects the seq_buf_putmem_hex() function, leading to a potential overflow.
Vulnerability Detail
The seq_buf_putmem_hex() function in the Kernel is vulnerable to an overflow issue. This vulnerability allows an attacker to overwrite adjacent memory locations, potentially leading to memory corruption, crashes, or even remote code execution. The vulnerability was introduced in version v2.6.27 of the Kernel and was fixed in version v5.4.133. 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.
Conclusion
In conclusion, the seq_buf_putmem_hex() function in the Kernel is vulnerable to an overflow issue. It is recommended to update the Linux Kernel to version v5.4.133 or later to mitigate this vulnerability. For further support on vulnerability remediation, you can contact DevNack.com.
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FAQ
The seq_buf API in the Kernel provides functions for handling sequential buffers. It allows efficient appending of data to a buffer and provides methods for reading and writing data in a sequential manner.
The overflow vulnerability in seq_buf_putmem_hex() can potentially lead to memory corruption, crashes, or remote code execution. However, the actual impact and attack plausibility have not been proven yet.
This vulnerability was introduced in version v2.6.27 of the Kernel and affects all versions up to v5.4.132. It has been fixed in version v5.4.133.
You can use Vulert's playground at Vulert Scanner to check if your system is affected by this vulnerability. Vulert uses a manifest file like package-lock.json to monitor and alert in real-time for open-source vulnerabilities in the software.
You can find more information about this vulnerability in the Open Source Vulnerability database maintained by the Cloud Security Alliance. The specific vulnerability ID is UVI-2021-1001351.
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