Medium [CVE-2026-74346] Fix OOB read during CQ MR registration
This medium-severity Red Hat Linux advisory covers CVE-2026-74346 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.
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Summary
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: 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 an OOB read by one.
A flaw was found in the Linux kernel's RDMA (Remote Direct Memory Access) irdma component. During Completion Queue (CQ) Memory Region (MR) registration, an internal field was not correctly initialized.
This could lead to an out-of-bounds read when handling queue memory, potentially allowing an attacker to access sensitive information or cause system instability. Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
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