linux-cve-announce - CVE-2025-39834: net/mlx5: HWS, Fix memory leak in hws_action_get_shared_stc

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Message-ID: <2025091657-CVE-2025-39834-4d8f@gregkh>
Date: Tue, 16 Sep 2025 15:09:02 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-39834: net/mlx5: HWS, Fix memory leak in hws_action_get_shared_stc_nic error flow

From: Greg Kroah-Hartman <gregkh@...nel.org>

Description
===========

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.

The Linux kernel CVE team has assigned CVE-2025-39834 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 6.12 with commit 504e536d90104c850731840d3fbc95acf251f11b and fixed in 6.16.5 with commit 051fd8576a2e4e95d5870c5c9f8679c5b16882e4
	Issue introduced in 6.12 with commit 504e536d90104c850731840d3fbc95acf251f11b and fixed in 6.17-rc4 with commit a630f83592cdad1253523a1b760cfe78fef6cd9c

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2025-39834
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	drivers/net/ethernet/mellanox/mlx5/core/steering/hws/action.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/051fd8576a2e4e95d5870c5c9f8679c5b16882e4
	https://git.kernel.org/stable/c/a630f83592cdad1253523a1b760cfe78fef6cd9c