Array Overflow Vulnerability in Linux Kernel - visconti_clk_register_gates()
Summary
CVE-2022-49186: In the Linux kernel, the following vulnerability has been resolved: clk: visconti: prevent array overflow in visconti_clk_register_gates() This code was using -1 to represent that there was no reset function. 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, providing essential services for all other parts of the system. It manages hardware resources and enables communication between software and hardware. The kernel is crucial for system stability and performance, and vulnerabilities within it can have severe implications for security and functionality. This specific vulnerability affects the visconti clock driver, which is responsible for managing clock signals in certain hardware configurations.
Vulnerability Detail
The vulnerability identified as CVE-2022-49186 arises from an improper handling of reset function identifiers within the visconti_clk_register_gates() function. The code incorrectly uses -1 to signify the absence of a reset function, but stores this value in an unsigned 8-bit integer (u8). As a result, the condition checking if the reset function identifier is greater than or equal to zero is always true, leading to potential out-of-bounds access. This flaw can result in memory corruption, crashes, or arbitrary code execution, posing a significant risk to system integrity.
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 by updating the Linux package as described in the 'how_to_fix' section.
Conclusion
The CVE-2022-49186 vulnerability in the Linux kernel poses a serious risk due to improper handling of reset function identifiers, leading to potential out-of-bounds access. It is crucial for users to update their Linux packages to the patched version to mitigate this risk. Utilizing tools like Vulert can help in monitoring and identifying vulnerabilities in open-source software.
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FAQ
CVE-2022-49186 is a vulnerability in the Linux kernel related to improper handling of reset function identifiers, leading to potential out-of-bounds access.
This vulnerability can lead to memory corruption, system crashes, or even arbitrary code execution, compromising system security and stability.
Yes, a patch is available in the form of an updated Linux kernel version 5.17.3-1 for Debian 12 and 13.
You can check if your application is affected by using the Vulert platform, which monitors and alerts for open-source vulnerabilities in real-time.
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