Critical Buffer Management Flaw in Linux Kernel - CVE-2025-40364
Summary
CVE-2025-40364: In the Linux kernel, the following vulnerability has been resolved: io_uring: fix io_req_prep_async with provided buffers io_req_prep_async() can import provided buffers, commit the ring state by giving up on that before... Affects linux versions < 6.1.129-1. Fixed in 6.1.129-1. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, managing hardware resources and providing essential services for software applications. It is known for its stability, performance, and flexibility, making it a popular choice for servers, desktops, and embedded systems. However, vulnerabilities can arise, such as CVE-2025-40364, which affects the io_uring subsystem responsible for asynchronous I/O operations, potentially leading to system instability or data corruption.
Vulnerability Detail
CVE-2025-40364 is a vulnerability in the Linux kernel's io_uring subsystem, specifically in the io_req_prep_async function. This function improperly handles provided buffers, which can lead to a situation where the ring state is committed prematurely. If the buffers are not correctly reimported later, it may result in unexpected behavior or crashes. This vulnerability poses risks of data loss or system crashes, particularly in environments that rely heavily on asynchronous I/O operations.
How To Fix
Minimum fixed version
6.1.129-1
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, no specific workarounds have been provided for this vulnerability. Users are advised to apply the available patches as soon as they are released.
Conclusion
CVE-2025-40364 is a critical vulnerability in the Linux kernel that affects buffer management in the io_uring subsystem. Users are strongly advised to update their systems to the latest patched versions to mitigate risks associated with this vulnerability.
See every vulnerability recorded for linux →
FAQ
CVE-2025-40364 is a vulnerability in the Linux kernel's io_uring subsystem that affects buffer management, potentially leading to system instability.
You can use the Vulert platform to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected without any signup.
The risks include potential data loss, system crashes, and instability in applications that rely on asynchronous I/O operations.
You can update your Linux kernel using the terminal commands: 'sudo apt update' followed by 'sudo apt upgrade linux'. Ensure you have the correct patched version.
Currently, there are no specific workarounds available. It is recommended to apply the patches as soon as they are released.
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