linux-cve-announce - CVE-2025-68779: net/mlx5e: Avoid unregistering PSP twice

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <2026011300-CVE-2025-68779-726e@gregkh>
Date: Tue, 13 Jan 2026 16:29:05 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-68779: net/mlx5e: Avoid unregistering PSP twice

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

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

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

net/mlx5e: Avoid unregistering PSP twice

PSP is unregistered twice in:
_mlx5e_remove -> mlx5e_psp_unregister
mlx5e_nic_cleanup -> mlx5e_psp_unregister

This leads to a refcount underflow in some conditions:
------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 2 PID: 1694 at lib/refcount.c:28 refcount_warn_saturate+0xd8/0xe0
[...]
 mlx5e_psp_unregister+0x26/0x50 [mlx5_core]
 mlx5e_nic_cleanup+0x26/0x90 [mlx5_core]
 mlx5e_remove+0xe6/0x1f0 [mlx5_core]
 auxiliary_bus_remove+0x18/0x30
 device_release_driver_internal+0x194/0x1f0
 bus_remove_device+0xc6/0x130
 device_del+0x159/0x3c0
 mlx5_rescan_drivers_locked+0xbc/0x2a0 [mlx5_core]
[...]

Do not directly remove psp from the _mlx5e_remove path, the PSP cleanup
happens as part of profile cleanup.

The Linux kernel CVE team has assigned CVE-2025-68779 to this issue.


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

	Issue introduced in 6.18 with commit 89ee2d92f66c45625ff1c173df2dbdea32568c5d and fixed in 6.18.3 with commit e12c912f92ccea671b514caf371f28485714bb4b
	Issue introduced in 6.18 with commit 89ee2d92f66c45625ff1c173df2dbdea32568c5d and fixed in 6.19-rc2 with commit 35e93736f69963337912594eb3951ab320b77521

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-2025-68779
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/en_main.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/e12c912f92ccea671b514caf371f28485714bb4b
	https://git.kernel.org/stable/c/35e93736f69963337912594eb3951ab320b77521