CVE-2026-68417
Received Received - Intake

RDMA QP Initialization Race Condition in Linux Kernel

Publication date: 2026-08-10

Last updated on: 2026-08-10

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: RDMA/siw: publish QP after initialization siw_create_qp() currently calls siw_qp_add() before the queues, CQ pointers, state, completion, and device list entry are ready. A QPN lookup can therefore reach a QP that is still being constructed. Move siw_qp_add() to the end of siw_create_qp(), after QP initialization and before adding the QP to the siw device list.

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Meta Information

Published
2026-08-10
Last Modified
2026-08-10
Generated
2026-08-10
AI Q&A
2026-08-10
EPSS Evaluated
N/A
NVD
CVE-2026-68417
EUVD
EUVD-2026-55603

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel involves a race condition in the RDMA/siw module where a queue pair (QP) is published before it is fully initialized. The siw_create_qp() function calls siw_qp_add() too early, allowing a QPN lookup to access a QP that is still being constructed, potentially leading to undefined behavior or crashes.

Detection Guidance

This vulnerability is specific to the Linux kernel's RDMA/siw component. Detection requires checking if the affected kernel version is running and if the siw module is loaded. Commands: uname -r to check kernel version, lsmod | grep siw to verify siw module, and dmesg | grep siw to check for related errors.

Impact Analysis

This vulnerability could cause system instability, crashes, or unexpected behavior in applications using RDMA over the siw driver. It may lead to data corruption or denial of service if exploited.

Mitigation Strategies

Update the Linux kernel to a patched version that includes the fix for CVE-2026-68417. If immediate patching is not possible, consider disabling the siw module using rmmod siw or blacklisting it to prevent exploitation.

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