---
id: CVE-2026-68418
title: 'RDMA/irdma: Prevent user-triggered null deref on QP create'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  RDMA/irdma: Prevent user-triggered null deref on QP create

  Previously, the user QP creation path would only attempt to
  populate iwqp->iwpbl if the user-provided req.us…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 <
    d52ff592abfcd56234f266aa245c489f70b1c554
  - >-
    Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 <
    ad68e0b759f9569f0dfea84f035c91eadb979802
  - >-
    Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 <
    ec675b4cdfd378d8c9dd8c93126c024f2469bd79
  - >-
    Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 <
    728211c815f6eef28dd3df2a5b6297483185aa20
  - >-
    Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 <
    b9b0889071569d43623c260074e159cd8f26adb1
  - Linux 5.14
published: '2026-08-10'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T12:44:05.184Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-68418'
references:
  - url: 'https://git.kernel.org/stable/c/d52ff592abfcd56234f266aa245c489f70b1c554'
  - url: 'https://git.kernel.org/stable/c/ad68e0b759f9569f0dfea84f035c91eadb979802'
  - url: 'https://git.kernel.org/stable/c/ec675b4cdfd378d8c9dd8c93126c024f2469bd79'
  - url: 'https://git.kernel.org/stable/c/728211c815f6eef28dd3df2a5b6297483185aa20'
  - url: 'https://git.kernel.org/stable/c/b9b0889071569d43623c260074e159cd8f26adb1'
tags:
  - cve.org
epss: 0.00155
epssPercentile: 0.04206
ingestedAt: '2026-10-21T12:48:53.599Z'
---

## Overview

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

RDMA/irdma: Prevent user-triggered null deref on QP create

Previously, the user QP creation path would only attempt to
populate iwqp->iwpbl if the user-provided req.user_wqe_bufs
field was non-zero. The problem is that iwqp->iwpbl is
unconditionally dereferenced later on in irdma_setup_virt_qp.

While there was a check for iwqp->iwpbl != NULL, this check
would only occur if req.user_wqe_bufs was non-zero. The end
result is that a user could send a zero user_wqe_bufs value
and trigger a null ptr deref.

Fix this by unconditionally calling irdma_get_pbl and bailing
if it fails, similar to the CQ and SRQ paths.

## Affected

- `Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < d52ff592abfcd56234f266aa245c489f70b1c554`
- `Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < ad68e0b759f9569f0dfea84f035c91eadb979802`
- `Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < ec675b4cdfd378d8c9dd8c93126c024f2469bd79`
- `Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < 728211c815f6eef28dd3df2a5b6297483185aa20`
- `Linux >= b48c24c2d710cf34810c555dcef883a3d35a9c08 < b9b0889071569d43623c260074e159cd8f26adb1`
- `Linux 5.14`

## Remediation

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