RDMA/cma: Fix listener leak in rdma_cma_listen_on_all() failure

Kernel Updated 02 Oct 2025

Summary

19/10/2021

Disclosed on

N/A

Severity

No i

Fix available

Unrated

Severity

Not published

CVSS Score

GSD-2021-1001727: RDMA/cma: Fix listener leak in rdma_cma_listen_on_all() failure. Affects Kernel versions >= c80a0c52d85c49a910d0dc0e342e8d8898677dc0, < e56a5146ef8cb51cd7c9e748267dce7564448a35. No fix is published. How to fix ↓

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Background

The RDMA/cma package is a component of the Linux Kernel that provides support for Remote Direct Memory Access (RDMA) communication. RDMA allows for high-speed, low-latency data transfers between remote systems. The RDMA/cma package includes functions for managing RDMA communication channels and endpoints. One of these functions is rdma_cma_listen_on_all(), which sets up a listener for incoming RDMA connection requests on all available network interfaces. However, a vulnerability has been discovered in this function that can lead to a resource leak when it fails to set up the listener properly.

Vulnerability Detail

The vulnerability in rdma_cma_listen_on_all() occurs when the function fails to allocate resources for the listener, but does not properly clean up the partially allocated resources. This can result in a resource leak, where the allocated memory and other resources are not freed. An attacker could potentially exploit this vulnerability to exhaust system resources, leading to a denial of service (DoS) condition. The vulnerability was introduced in Linux Kernel version v5.11 and has been fixed in version v5.14.10.

How To Fix

No fixed version is published for this vulnerability.

To fix this vulnerability, it is recommended to update the Linux Kernel to version v5.14.10 or later. This can be done by downloading the latest kernel source code from the official Linux Kernel repository (https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/) and compiling it for your system. Alternatively, you can check if your system's package manager provides an updated version of the Linux Kernel and install it using the appropriate package management commands.

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Workaround

There is no specific workaround provided for this vulnerability. The recommended solution is to update the Linux Kernel to the fixed version.

Conclusion

In conclusion, the vulnerability in rdma_cma_listen_on_all() can result in a resource leak and potential denial of service (DoS) condition. It is crucial to update the Linux Kernel to version v5.14.10 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.

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