Critical Vulnerability in Linux Kernel: vhost vringh Return Value Check Issue
Summary
DEBIAN-CVE-2025-40051: In the Linux kernel, the following vulnerability has been resolved: vhost: vringh: Modify the return value check The return value of copy_from_iter and copy_to_iter can't be negative, check whether the copied lengths are... Affects linux versions 6.1.106-1 – 6.9.9-1. No fix is published. How to fix ↓
Check if this vulnerability affects your application
Upload a manifest or SBOM and we'll show whether you're affected, plus every other risky package in the same scan.
No signup required · Results in about 60 seconds
Habilume
Habit tracker with a companion that grows with you
Complete habits, earn Lume Points, and watch your Lume grow as you stay consistent.
Background
The Linux kernel is a core component of many operating systems, including Debian. It manages system resources and hardware interactions, providing essential services for applications. The kernel's stability and security are paramount, as vulnerabilities can lead to system crashes, data breaches, or unauthorized access. This specific vulnerability affects the vhost subsystem, which is responsible for high-performance networking in virtualized environments.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the vhost subsystem related to the vringh implementation. The issue arises from an improper check of the return values from the functions copy_from_iter and copy_to_iter. These functions are designed to copy data between user space and kernel space. The vulnerability allows for the possibility of negative return values, which could lead to incorrect assumptions about the success of data transfers, potentially resulting in memory corruption or denial of service. This flaw has been classified as CVE-2025-40051.
How To Fix
No fixed version is published for this vulnerability.
Tip — Not sure whether your app is affected? Vulert can check the versions your app actually runs. Scan free →
Workaround
As of now, no specific workarounds have been provided for this vulnerability. It is recommended to apply the patch as soon as it becomes available to mitigate any potential risks.
Conclusion
The vulnerability CVE-2025-40051 in the Linux kernel's vhost subsystem poses significant risks to system stability and security. Users are advised to update their systems promptly to mitigate these risks. Utilizing tools like Vulert can enhance your ability to monitor and manage vulnerabilities effectively.
See every vulnerability recorded for linux →
FAQ
CVE-2025-40051 is a vulnerability in the Linux kernel's vhost subsystem that involves improper return value checks, potentially leading to memory corruption.
You can use the Vulert platform to check if your application is affected by this vulnerability. Simply upload your manifest file like package-lock.json to monitor and alert for open-source vulnerabilities.
The risks include potential memory corruption, system crashes, or denial of service, which could compromise the stability and security of the affected systems.
Yes, a patch is expected to be released. Users should regularly update their Linux packages to ensure they have the latest security fixes.
Vulert uses a manifest file to monitor and alert in real-time for open-source vulnerabilities in your software, providing a proactive approach to security.
References
Related vulnerabilities
Recent vulnerabilities recorded for linux.
Habilume
Habit tracker with a companion that grows with you
Complete habits, earn Lume Points, and watch your Lume grow as you stay consistent.
