---
id: CVE-2025-39834
title: 'net/mlx5: HWS, Fix memory leak in hws_action_get_shared_stc_nic error flow'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  net/mlx5: HWS, Fix memory leak in hws_action_get_shared_stc_nic error flow

  When an invalid stc_type is provided, the function allocates memory for
  shared_stc but jumps…
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 >= 504e536d90104c850731840d3fbc95acf251f11b <
    a2751e1af5dc8b1a64cfd463576c58617c2573ac
  - >-
    Linux >= 504e536d90104c850731840d3fbc95acf251f11b <
    051fd8576a2e4e95d5870c5c9f8679c5b16882e4
  - >-
    Linux >= 504e536d90104c850731840d3fbc95acf251f11b <
    a630f83592cdad1253523a1b760cfe78fef6cd9c
  - Linux 6.12
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-01-14T18:18:41.812797Z'
published: '2025-09-16'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T12:37:26.260Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2025-39834'
references:
  - url: 'https://git.kernel.org/stable/c/a2751e1af5dc8b1a64cfd463576c58617c2573ac'
  - url: 'https://git.kernel.org/stable/c/051fd8576a2e4e95d5870c5c9f8679c5b16882e4'
  - url: 'https://git.kernel.org/stable/c/a630f83592cdad1253523a1b760cfe78fef6cd9c'
tags:
  - cve.org
epss: 0.00187
epssPercentile: 0.08239
ingestedAt: '2026-10-21T12:48:53.689Z'
---

## Overview

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

net/mlx5: HWS, Fix memory leak in hws_action_get_shared_stc_nic error flow

When an invalid stc_type is provided, the function allocates memory for
shared_stc but jumps to unlock_and_out without freeing it, causing a
memory leak.

Fix by jumping to free_shared_stc label instead to ensure proper cleanup.

## Affected

- `Linux >= 504e536d90104c850731840d3fbc95acf251f11b < a2751e1af5dc8b1a64cfd463576c58617c2573ac`
- `Linux >= 504e536d90104c850731840d3fbc95acf251f11b < 051fd8576a2e4e95d5870c5c9f8679c5b16882e4`
- `Linux >= 504e536d90104c850731840d3fbc95acf251f11b < a630f83592cdad1253523a1b760cfe78fef6cd9c`
- `Linux 6.12`

## Remediation

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