linux-cve-announce - CVE-2025-71196: phy: stm32-usphyc: Fix off by one in probe()

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Message-ID: <2026020449-CVE-2025-71196-cf4b@gregkh>
Date: Wed,  4 Feb 2026 17:04:43 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-71196: phy: stm32-usphyc: Fix off by one in probe()

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

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

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

phy: stm32-usphyc: Fix off by one in probe()

The "index" variable is used as an index into the usbphyc->phys[] array
which has usbphyc->nphys elements.  So if it is equal to usbphyc->nphys
then it is one element out of bounds.  The "index" comes from the
device tree so it's data that we trust and it's unlikely to be wrong,
however it's obviously still worth fixing the bug.  Change the > to >=.

The Linux kernel CVE team has assigned CVE-2025-71196 to this issue.


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

	Issue introduced in 4.17 with commit 94c358da3a0545205c6c6a50ae26141f1c73acfa and fixed in 6.6.122 with commit 76b870fdaad82171a24b8aacffe5e4d9e0d2ee2c
	Issue introduced in 4.17 with commit 94c358da3a0545205c6c6a50ae26141f1c73acfa and fixed in 6.12.67 with commit b91c9f6bfb04e430adeeac7e7ebc9d80f9d72bad
	Issue introduced in 4.17 with commit 94c358da3a0545205c6c6a50ae26141f1c73acfa and fixed in 6.18.7 with commit 7c27eaf183563b86d815ff6e9cca0210b4cfa051
	Issue introduced in 4.17 with commit 94c358da3a0545205c6c6a50ae26141f1c73acfa and fixed in 6.19-rc6 with commit cabd25b57216ddc132efbcc31f972baa03aad15a

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-2025-71196
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/phy/st/phy-stm32-usbphyc.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/76b870fdaad82171a24b8aacffe5e4d9e0d2ee2c
	https://git.kernel.org/stable/c/b91c9f6bfb04e430adeeac7e7ebc9d80f9d72bad
	https://git.kernel.org/stable/c/7c27eaf183563b86d815ff6e9cca0210b4cfa051
	https://git.kernel.org/stable/c/cabd25b57216ddc132efbcc31f972baa03aad15a