Out-of-Bound Write Vulnerability in Linux Kernel - CVE-2025-38082
Summary
DEBIAN-CVE-2025-38082: In the Linux kernel, the following vulnerability has been resolved: gpio: virtuser: fix potential out-of-bound write If the caller wrote more characters, count is truncated to the max available space in "simple_write_to_... Affects linux versions < 6.12.32-1. Fixed in 6.12.32-1. How to fix ↓
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Background
The Linux kernel is the core component of the Linux operating system, responsible for managing hardware resources and providing essential services to software applications. It is widely used across various platforms, including servers, desktops, and embedded systems. The kernel's functionality includes process management, memory management, device drivers, and system calls. This vulnerability specifically affects the GPIO (General Purpose Input/Output) subsystem, which allows software to control hardware pins on a device. The vulnerability arises from insufficient input size checks, making it susceptible to out-of-bound write attacks.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the GPIO subsystem, specifically in the virtuser implementation. The issue occurs when a caller writes more characters than the allocated buffer can handle. The count of characters is truncated to the maximum available space in the 'simple_write_to_buffer' function, leading to a potential out-of-bound write. This can result in memory corruption, which may allow an attacker to execute arbitrary code, crash the system, or escalate privileges. The vulnerability is classified under CVE-2025-38082 and affects multiple versions of the Linux package in Debian.
How To Fix
Minimum fixed version
6.12.32-1
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
As a temporary workaround, users can limit the input size to the buffer manually in their applications to prevent exceeding the allocated space. However, this is not a permanent solution and updating the package is strongly recommended.
Conclusion
The CVE-2025-38082 vulnerability in the Linux kernel poses significant risks due to its potential for out-of-bound writes. Users are urged to update their systems to the patched version to ensure security. Utilizing tools like Vulert can help monitor for such vulnerabilities in real-time.
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FAQ
CVE-2025-38082 is a vulnerability in the Linux kernel's GPIO subsystem that allows for potential out-of-bound writes due to insufficient input size checks.
You can use Vulert to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected by this vulnerability.
The risks include memory corruption, potential system crashes, arbitrary code execution, and privilege escalation, which can compromise system security.
Yes, a patch is available in version 6.12.32-1 of the Linux package. It is recommended to update to this version to mitigate the vulnerability.
If immediate updates are not possible, consider implementing input size checks in your applications as a temporary workaround until you can apply the patch.
References
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