Critical Vulnerability in Linux Kernel: RDMA/mlx5 Use-After-Free Issue
Summary
DEBIAN-CVE-2025-21714: In the Linux kernel, the following vulnerability has been resolved: RDMA/mlx5: Fix implicit ODP use after free Prevent double queueing of implicit ODP mr destroy work by using __xa_cmpxchg() to make sure this is the only... Affects linux versions < 6.12.13-1. Fixed in 6.12.13-1. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, providing essential services for hardware management and system resources. It supports a wide range of functionalities, including networking, file systems, and device drivers. The kernel's stability and security are paramount, as vulnerabilities can lead to severe system compromises. This specific vulnerability affects the RDMA/mlx5 subsystem, which is responsible for remote direct memory access operations, enabling high-performance networking capabilities.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the RDMA/mlx5 subsystem, specifically related to the improper handling of memory references. The issue arises from the potential for a use-after-free condition, where a memory region can be accessed after it has been freed. This can lead to critical system errors, including refcount_t underflow and potential system crashes. The vulnerability allows for double queueing of implicit ODP (On-Demand Paging) memory region destruction, which can result in executing a work item after the memory has already been released, causing undefined behavior and security risks.
How To Fix
Minimum fixed version
6.12.13-1
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. It is highly recommended to apply the patch as soon as it becomes available to mitigate risks.
Conclusion
The RDMA/mlx5 use-after-free vulnerability in the Linux kernel poses significant risks to system stability and security. Users are strongly advised to update their kernel to the patched version 6.12.13-1 to protect against potential exploits. Monitoring tools like Vulert can assist in identifying vulnerabilities in your software.
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FAQ
The vulnerability is a use-after-free issue in the RDMA/mlx5 subsystem of the Linux kernel, which can lead to system instability and security risks.
You can use tools like Vulert to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected.
Exploiting this vulnerability could lead to system crashes, data corruption, or unauthorized access to system resources.
Yes, a patch is available in the form of the updated Linux kernel version 6.12.13-1.
While there are no specific workarounds, it is crucial to plan for an update as soon as possible to mitigate the risks associated with this vulnerability.
References
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