Vulnerability in xprtrdma package: Treat all calls not a bcall when bc_serv is NULL

Kernel Updated 02 Oct 2025

Summary

28/06/2022

Disclosed on

N/A

Severity

No i

Fix available

Unrated

Severity

Not published

CVSS Score

GSD-2022-1003833: xprtrdma: treat all calls not a bcall when bc_serv is NULL. Affects Kernel versions < 998d35a2aff4b81a1c784f3aa45cd3afff6814c1. No fix is published. How to fix ↓

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Background

The xprtrdma package is a component of the Linux Kernel ecosystem. It provides support for Remote Direct Memory Access (RDMA) over RPC (Remote Procedure Call) transport. RDMA allows for high-speed data transfers between remote systems without involving the CPU. The xprtrdma package is responsible for handling RDMA operations in the kernel. However, a vulnerability has been discovered in the package that can potentially be exploited by attackers.

Vulnerability Detail

The vulnerability in the xprtrdma package arises when calls are not treated as bcall (back-channel call) when bc_serv (back-channel service) is NULL. This issue can lead to a security breach, although the exact impact and attack plausibility have not been proven yet. It is important to note that this vulnerability has been fixed in the Linux Kernel version v4.19.247 by commit 998d35a2aff4b81a1c784f3aa45cd3afff6814c1.

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 v4.19.247 or later. This can be done by pulling the latest changes from the official Linux Kernel repository and rebuilding the kernel. Alternatively, users can wait for their Linux distribution to release an updated kernel package that includes the fix.

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Workaround

There is no specific workaround mentioned for this vulnerability. The recommended approach is to apply the fix by updating the Linux Kernel.

Conclusion

In conclusion, the xprtrdma package in the Linux Kernel is vulnerable to a security issue where calls are not treated as bcall when bc_serv is NULL. This vulnerability has been fixed in the Linux Kernel version v4.19.247. It is crucial to update the kernel to ensure the security of the system. For further support on vulnerability remediation, please contact DevNack.com.

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