---
id: CVE-2025-39830
title: 'net/mlx5: HWS, Fix memory leak in hws_pool_buddy_init error path'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net/mlx5: HWS, Fix memory leak in hws_pool_buddy_init error path

  In the error path of hws_pool_buddy_init(), the buddy allocator cleanup
  doesn't free the allocator str…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: adp
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= c61afff94373641695cc81999e9bb10408ea84d5 <
    4ccdbf50dd88a2a7399409e68887dd8077f6a562
  - >-
    Linux >= c61afff94373641695cc81999e9bb10408ea84d5 <
    86d13a6f49cb68aa91bd718b1b627e72e77285c1
  - >-
    Linux >= c61afff94373641695cc81999e9bb10408ea84d5 <
    2c0a959bebdc1ada13cf9a8242f177c5400299e6
  - Linux 6.12
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-01-14T18:17:36.992991Z'
published: '2025-09-16'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T12:37:25.183Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2025-39830'
references:
  - url: 'https://git.kernel.org/stable/c/4ccdbf50dd88a2a7399409e68887dd8077f6a562'
  - url: 'https://git.kernel.org/stable/c/86d13a6f49cb68aa91bd718b1b627e72e77285c1'
  - url: 'https://git.kernel.org/stable/c/2c0a959bebdc1ada13cf9a8242f177c5400299e6'
tags:
  - cve.org
epss: 0.00187
epssPercentile: 0.0824
ingestedAt: '2026-10-21T12:48:53.688Z'
---

## Overview

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

net/mlx5: HWS, Fix memory leak in hws_pool_buddy_init error path

In the error path of hws_pool_buddy_init(), the buddy allocator cleanup
doesn't free the allocator structure itself, causing a memory leak.

Add the missing kfree() to properly release all allocated memory.

## Affected

- `Linux >= c61afff94373641695cc81999e9bb10408ea84d5 < 4ccdbf50dd88a2a7399409e68887dd8077f6a562`
- `Linux >= c61afff94373641695cc81999e9bb10408ea84d5 < 86d13a6f49cb68aa91bd718b1b627e72e77285c1`
- `Linux >= c61afff94373641695cc81999e9bb10408ea84d5 < 2c0a959bebdc1ada13cf9a8242f177c5400299e6`
- `Linux 6.12`

## Remediation

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