Use After Free Vulnerability in RDMA/siw

Kernel Updated 02 Oct 2025

Summary

31/05/2021

Disclosed on

N/A

Severity

No i

Fix available

Unrated

Severity

Not published

CVSS Score

GSD-2021-1000227: RDMA/siw: Fix a use after free in siw_alloc_mr. Affects Kernel versions >= 2251334dcac9eb337575d8767e2a6a7e81848f7f, < ad9ce7188432650469a6c7625bf479f5ed0b6155. No fix is published. How to fix ↓

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Background

The RDMA/siw package is a component of the Linux Kernel that provides support for the Softiwarp RDMA driver. RDMA (Remote Direct Memory Access) is a technology that allows for high-speed data transfer between remote systems. The siw_alloc_mr function in RDMA/siw is responsible for allocating memory resources for RDMA operations. However, a use after free vulnerability has been discovered in this function, which could potentially lead to memory corruption and system instability.

Vulnerability Detail

The use after free vulnerability in siw_alloc_mr occurs when the function attempts to access memory that has already been freed. This can occur if a memory region is freed while it is still being used by the RDMA operations. An attacker could potentially exploit this vulnerability to execute arbitrary code or cause a denial of service by manipulating the freed memory. The vulnerability was introduced in version v5.3 of the Linux Kernel and has been fixed in version v5.12.4.

How To Fix

No fixed version is published for this vulnerability.

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Workaround

There is no known workaround for this vulnerability. It is necessary to update the Linux Kernel to the fixed version.

Conclusion

The use after free vulnerability in RDMA/siw can lead to memory corruption and system instability. It is crucial to update the Linux Kernel to version v5.12.4 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.

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