linux-cve-announce - CVE-2025-38125: net: stmmac: make sure that ptp

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Message-ID: <2025070328-CVE-2025-38125-8a6b@gregkh>
Date: Thu,  3 Jul 2025 10:35:42 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38125: net: stmmac: make sure that ptp_rate is not 0 before configuring EST

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

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

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

net: stmmac: make sure that ptp_rate is not 0 before configuring EST

If the ptp_rate recorded earlier in the driver happens to be 0, this
bogus value will propagate up to EST configuration, where it will
trigger a division by 0.

Prevent this division by 0 by adding the corresponding check and error
code.

The Linux kernel CVE team has assigned CVE-2025-38125 to this issue.


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

	Issue introduced in 5.6 with commit 8572aec3d0dc43045254fd1bf581fb980bfdbc4b and fixed in 6.12.34 with commit 451ee661d0f6272017fa012f99617101aa8ddf2c
	Issue introduced in 5.6 with commit 8572aec3d0dc43045254fd1bf581fb980bfdbc4b and fixed in 6.15.3 with commit d5e3bfdba0dc419499b801937128957f77503761
	Issue introduced in 5.6 with commit 8572aec3d0dc43045254fd1bf581fb980bfdbc4b and fixed in 6.16-rc1 with commit cbefe2ffa7784525ec5d008ba87c7add19ec631a

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-2025-38125
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/stmicro/stmmac/stmmac_est.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/451ee661d0f6272017fa012f99617101aa8ddf2c
	https://git.kernel.org/stable/c/d5e3bfdba0dc419499b801937128957f77503761
	https://git.kernel.org/stable/c/cbefe2ffa7784525ec5d008ba87c7add19ec631a