---
id: CVE-2026-74377
title: |-
  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.…
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'
cwe:
  - CWE-20
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 7
  - enterprise_linux 8
  - enterprise_linux 9
published: '2026-08-15'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T19:17:42.683'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-74377'
references:
  - url: 'https://git.kernel.org/stable/c/2e60378fb3c8b51c94103bb40014c4fe38fa5033'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5420eebf3b3c162bfaf965f30e61cd1d689e5732'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/9fa785137303f7109c23dea779b8dedc67c9b531'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a211b7904aed365e4e4f08a48ec6e6dd1ea7b16b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d6ab440240a04b8737ee4c7bb21af9182e451733'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/fc72fd61cc8b2e2e3e92ae4c0e9cc30c9a7ecb78'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74377.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-74377'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2516773'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-74377'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-74377'
  - url: 'https://kernelcve.org/list/?q=CVE-2026-74377'
  - url: >-
      https://lore.kernel.org/linux-cve-announce/2026081504-CVE-2026-74377-9467@gregkh/T
tags:
  - nvd
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00129
epssPercentile: 0.02543
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T18:54:49.610673Z'
scores:
  nvd: 7.8
  vendor: 4.7
  cna: 7.8
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.

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · updated 2026-10-26 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74377.json)