linux-cve-announce - CVE-2025-39786: iio: adc: ad7173: fix channels index for syscalib

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Message-ID: <2025091151-CVE-2025-39786-96c9@gregkh>
Date: Thu, 11 Sep 2025 18:57:04 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-39786: iio: adc: ad7173: fix channels index for syscalib_mode

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

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

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

iio: adc: ad7173: fix channels index for syscalib_mode

Fix the index used to look up the channel when accessing the
syscalib_mode attribute. The address field is a 0-based index (same
as scan_index) that it used to access the channel in the
ad7173_channels array throughout the driver. The channels field, on
the other hand, may not match the address field depending on the
channel configuration specified in the device tree and could result
in an out-of-bounds access.

The Linux kernel CVE team has assigned CVE-2025-39786 to this issue.


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

	Issue introduced in 6.14 with commit 031bdc8aee01b7b298159eee541844d8bff4467d and fixed in 6.16.4 with commit 2def1a8691eb43654da0ae0d2fdb3722e20262a5
	Issue introduced in 6.14 with commit 031bdc8aee01b7b298159eee541844d8bff4467d and fixed in 6.17-rc1 with commit 0eb8d7b25397330beab8ee62c681975b79f37223

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-2025-39786
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/iio/adc/ad7173.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/2def1a8691eb43654da0ae0d2fdb3722e20262a5
	https://git.kernel.org/stable/c/0eb8d7b25397330beab8ee62c681975b79f37223