---
id: CVE-2026-72495
title: 'RDMA/bnxt_re: Avoid repeated requests to allocate WC pages'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  RDMA/bnxt_re: Avoid repeated requests to allocate WC pages

  Applications can request multiple WC pages for the same ucontext.
  As of now, only 1 WC page per ucontext is …
severity: critical
cvss: 9.3
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 360da60d6c6edb9740de7a8e6d8969d62ceff956 <
    478c4d24193fe3e6aa2accd4874ae43000e4a217
  - >-
    Linux >= 360da60d6c6edb9740de7a8e6d8969d62ceff956 <
    da406b8b49c1dfe661a497483940d7ee781430db
  - >-
    Linux >= 360da60d6c6edb9740de7a8e6d8969d62ceff956 <
    441baa79043431807115fd030d7d0bb14ed441a0
  - Linux 6.5
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T18:51:00.430753Z'
published: '2026-08-15'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T18:55:26.977Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-72495'
references:
  - url: 'https://git.kernel.org/stable/c/478c4d24193fe3e6aa2accd4874ae43000e4a217'
  - url: 'https://git.kernel.org/stable/c/da406b8b49c1dfe661a497483940d7ee781430db'
  - url: 'https://git.kernel.org/stable/c/441baa79043431807115fd030d7d0bb14ed441a0'
tags:
  - cve.org
epss: 0.00194
epssPercentile: 0.08444
ingestedAt: '2026-10-16T19:46:24.390Z'
---

## Overview

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

RDMA/bnxt_re: Avoid repeated requests to allocate WC pages

Applications can request multiple WC pages for the same ucontext.
As of now, only 1 WC page per ucontext is supported. Add a lock to
avoid concurrent access and a check to fail repeated requests.
Also, if the mmap entry insert fails for the WC, free the Doorbell
page index mapped for the WC page.

## Affected

- `Linux >= 360da60d6c6edb9740de7a8e6d8969d62ceff956 < 478c4d24193fe3e6aa2accd4874ae43000e4a217`
- `Linux >= 360da60d6c6edb9740de7a8e6d8969d62ceff956 < da406b8b49c1dfe661a497483940d7ee781430db`
- `Linux >= 360da60d6c6edb9740de7a8e6d8969d62ceff956 < 441baa79043431807115fd030d7d0bb14ed441a0`
- `Linux 6.5`

## Remediation

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