linux-cve-announce - CVE-2023-53398: mlx5: fix possible ptp queue fifo use-after-free

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Message-ID: <2025091859-CVE-2023-53398-2464@gregkh>
Date: Thu, 18 Sep 2025 15:34:43 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53398: mlx5: fix possible ptp queue fifo use-after-free

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

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

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

mlx5: fix possible ptp queue fifo use-after-free

Fifo indexes are not checked during pop operations and it leads to
potential use-after-free when poping from empty queue. Such case was
possible during re-sync action. WARN_ON_ONCE covers future cases.

There were out-of-order cqe spotted which lead to drain of the queue and
use-after-free because of lack of fifo pointers check. Special check and
counter are added to avoid resync operation if SKB could not exist in the
fifo because of OOO cqe (skb_id must be between consumer and producer
index).

The Linux kernel CVE team has assigned CVE-2023-53398 to this issue.


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

	Issue introduced in 6.0 with commit 58a518948f60153e8f6cb8361d2712aa3a1af94a and fixed in 6.1.18 with commit 52e6e7a0bc04c85012a9251c7cf2d444a77eb966
	Issue introduced in 6.0 with commit 58a518948f60153e8f6cb8361d2712aa3a1af94a and fixed in 6.2.5 with commit 6afdedc4e66e3846ce497744f01b95c34bf39d21
	Issue introduced in 6.0 with commit 58a518948f60153e8f6cb8361d2712aa3a1af94a and fixed in 6.3 with commit 3a50cf1e8e5157b82268eee7e330dbe5736a0948

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-2023-53398
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/ptp.c
	drivers/net/ethernet/mellanox/mlx5/core/en/txrx.h
	drivers/net/ethernet/mellanox/mlx5/core/en_stats.c
	drivers/net/ethernet/mellanox/mlx5/core/en_stats.h


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/52e6e7a0bc04c85012a9251c7cf2d444a77eb966
	https://git.kernel.org/stable/c/6afdedc4e66e3846ce497744f01b95c34bf39d21
	https://git.kernel.org/stable/c/3a50cf1e8e5157b82268eee7e330dbe5736a0948