---
id: CVE-2026-98486
title: 'net: ena: fix MMIO read buffer leak on probe failure'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net: ena: fix MMIO read buffer leak on probe failure

  ena_device_init() initializes the MMIO read mechanism with
  ena_com_mmio_reg_read_request_init(), which allocates a…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 1738cd3ed342294360d6a74d4e58800004bff854 <
    7bd3e9a2d0c288e54f51df260d9433163f5fbc1e
  - >-
    Linux >= 1738cd3ed342294360d6a74d4e58800004bff854 <
    30ff01b4c7e419bb70f40f01dcd7f6af680808b3
  - >-
    Linux >= 1738cd3ed342294360d6a74d4e58800004bff854 <
    47785f9f638b064ce6e32e8e3b6f1ffd83849fc2
  - >-
    Linux >= 1738cd3ed342294360d6a74d4e58800004bff854 <
    9476b4468862927297c94c440863cd8ed1e7cc83
  - Linux 4.9
published: '2026-10-18'
updated: '2026-10-18'
sourceUpdated: '2026-10-18T15:16:03.002Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-98486'
references:
  - url: 'https://git.kernel.org/stable/c/7bd3e9a2d0c288e54f51df260d9433163f5fbc1e'
  - url: 'https://git.kernel.org/stable/c/30ff01b4c7e419bb70f40f01dcd7f6af680808b3'
  - url: 'https://git.kernel.org/stable/c/47785f9f638b064ce6e32e8e3b6f1ffd83849fc2'
  - url: 'https://git.kernel.org/stable/c/9476b4468862927297c94c440863cd8ed1e7cc83'
tags:
  - cve.org
ingestedAt: '2026-10-18T15:45:12.294Z'
---

## Overview

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

net: ena: fix MMIO read buffer leak on probe failure

ena_device_init() initializes the MMIO read mechanism with
ena_com_mmio_reg_read_request_init(), which allocates a coherent DMA
buffer for MMIO read responses.

The normal removal path releases this buffer through
ena_com_mmio_reg_read_request_destroy(). However, if ena_probe() fails
after ena_device_init() succeeds, the error path destroys the admin
resources and eventually frees ena_dev without destroying the MMIO read
request, leaving the coherent DMA buffer allocated.

Call ena_com_mmio_reg_read_request_destroy() in the probe error path
before releasing the remaining device resources.

This issue was found by manual code inspection.

## Affected

- `Linux >= 1738cd3ed342294360d6a74d4e58800004bff854 < 7bd3e9a2d0c288e54f51df260d9433163f5fbc1e`
- `Linux >= 1738cd3ed342294360d6a74d4e58800004bff854 < 30ff01b4c7e419bb70f40f01dcd7f6af680808b3`
- `Linux >= 1738cd3ed342294360d6a74d4e58800004bff854 < 47785f9f638b064ce6e32e8e3b6f1ffd83849fc2`
- `Linux >= 1738cd3ed342294360d6a74d4e58800004bff854 < 9476b4468862927297c94c440863cd8ed1e7cc83`
- `Linux 4.9`

## Remediation

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