CVE-2026-74346

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

RDMA/irdma: Fix OOB read during CQ MR registration

Sashiko pointed out an unrelated bug during a previous patch:

https://sashiko.dev/#/patchset/20260512183852.614045-1-jmoroni%40google.com

This change fixes the bug by eliminating the cqmr->split field which

was not being set properly and instead just checks the CQ resize

feature flag directly.

The cqmr->split field essentially tracks whether IRDMA_FEATURE_CQ_RESIZE

is set, but it was not being set until CQ creation time, which is _after_

CQ memory registration (the only other place where it is referenced).

As a result, it would always be false during MR registration and would

therefore cause irdma_handle_q_mem to populate cqmr->shadow even for GEN_2

HW and beyond:

cqmr->shadow = (dma_addr_t)arr[req->cq_pages];

The issue is that for GEN_2 and beyond, req->cq_pages may be exactly equal

to iwmr->page_cnt and therefore equal to the size of arr, which would cause

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References