---
id: CVE-2026-74377
title: 'RDMA/rxe: Copy WQE to local buffer in non-SRQ receive path'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  RDMA/rxe: Copy WQE to local buffer in non-SRQ receive path

  For non-SRQ QPs, the responder reads WQE fields directly from the
  shared queue buffer mapped into userspace.…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 <
    2e60378fb3c8b51c94103bb40014c4fe38fa5033
  - >-
    Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 <
    fc72fd61cc8b2e2e3e92ae4c0e9cc30c9a7ecb78
  - >-
    Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 <
    9fa785137303f7109c23dea779b8dedc67c9b531
  - >-
    Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 <
    5420eebf3b3c162bfaf965f30e61cd1d689e5732
  - >-
    Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 <
    a211b7904aed365e4e4f08a48ec6e6dd1ea7b16b
  - >-
    Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 <
    d6ab440240a04b8737ee4c7bb21af9182e451733
  - Linux 4.8
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T18:54:49.610673Z'
published: '2026-08-15'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T18:55:36.323Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-74377'
references:
  - url: 'https://git.kernel.org/stable/c/2e60378fb3c8b51c94103bb40014c4fe38fa5033'
  - url: 'https://git.kernel.org/stable/c/fc72fd61cc8b2e2e3e92ae4c0e9cc30c9a7ecb78'
  - url: 'https://git.kernel.org/stable/c/9fa785137303f7109c23dea779b8dedc67c9b531'
  - url: 'https://git.kernel.org/stable/c/5420eebf3b3c162bfaf965f30e61cd1d689e5732'
  - url: 'https://git.kernel.org/stable/c/a211b7904aed365e4e4f08a48ec6e6dd1ea7b16b'
  - url: 'https://git.kernel.org/stable/c/d6ab440240a04b8737ee4c7bb21af9182e451733'
tags:
  - cve.org
epss: 0.00129
epssPercentile: 0.02268
ingestedAt: '2026-10-16T19:46:24.372Z'
---

## Overview

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

RDMA/rxe: Copy WQE to local buffer in non-SRQ receive path

For non-SRQ QPs, the responder reads WQE fields directly from the
shared queue buffer mapped into userspace. This allows a malicious
user to modify fields like num_sge or sge entries while the kernel
is processing the WQE, leading to out-of-bounds reads in
rxe_resp_check_length() and copy_data().

Introduce get_recv_wqe() that validates num_sge and copies the WQE
to a kernel-local buffer before processing, matching the approach
already used for SRQ WQEs in get_srq_wqe(). The srq_wqe buffer is
reused since SRQ and non-SRQ paths are mutually exclusive per QP.

## Affected

- `Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 < 2e60378fb3c8b51c94103bb40014c4fe38fa5033`
- `Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 < fc72fd61cc8b2e2e3e92ae4c0e9cc30c9a7ecb78`
- `Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 < 9fa785137303f7109c23dea779b8dedc67c9b531`
- `Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 < 5420eebf3b3c162bfaf965f30e61cd1d689e5732`
- `Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 < a211b7904aed365e4e4f08a48ec6e6dd1ea7b16b`
- `Linux >= 8700e3e7c4857d28ebaa824509934556da0b3e76 < d6ab440240a04b8737ee4c7bb21af9182e451733`
- `Linux 4.8`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.