Critical RDMA Resource Management Vulnerability in Linux Kernel
Summary
CVE-2025-21829: In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Fix the warning "rxe_cleanup+0x12c/0x170 [rdma_rxe]" The Call Trace is as below: " ? 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 Linux operating systems, responsible for managing hardware resources and providing essential services to applications. It supports various functionalities, including process management, memory management, and device control. The kernel's RDMA (Remote Direct Memory Access) subsystem allows for high-throughput, low-latency networking, which is crucial for performance-sensitive applications. However, this subsystem is vulnerable to a resource management issue that can lead to improper handling of RDMA resources.
Vulnerability Detail
The vulnerability, identified as CVE-2025-21829, arises from the RDMA/rxe component of the Linux kernel. When an excessive number of RDMA resources are allocated, the rxe module may not have sufficient time to manage these resources effectively. This can result in a failure to release RDMA resources correctly, potentially leading to system instability or crashes. The issue is exacerbated by a timeout setting that is insufficient compared to other RDMA drivers, making it critical for users to address this vulnerability promptly.
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
As a temporary workaround, users can reduce the number of RDMA resources allocated to prevent triggering the vulnerability. This can be done by adjusting the configuration settings of the RDMA subsystem to limit resource allocation, although this may impact performance.
Conclusion
CVE-2025-21829 is a critical vulnerability in the Linux kernel's RDMA subsystem that requires immediate attention. Users should update their systems to the latest patched version to prevent potential instability. By understanding the nature of this vulnerability and implementing the recommended fixes, users can ensure their systems remain secure.
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FAQ
CVE-2025-21829 is a vulnerability in the RDMA/rxe component of the Linux kernel that can lead to improper handling of RDMA resources.
This vulnerability can cause system instability or crashes if too many RDMA resources are allocated and not released correctly.
Yes, a patched version of the Linux kernel is available. Users should update their kernel to the latest version to mitigate this vulnerability.
RDMA resources are components used in Remote Direct Memory Access operations, allowing data to be transferred directly between memory locations without involving the CPU.
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