linux-cve-announce - CVE-2025-22082: iio: backend: make sure to NULL terminate stack buffer

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Message-ID: <2025041614-CVE-2025-22082-dcb0@gregkh>
Date: Wed, 16 Apr 2025 16:12:53 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-22082: iio: backend: make sure to NULL terminate stack buffer

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

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

iio: backend: make sure to NULL terminate stack buffer

Make sure to NULL terminate the buffer in
iio_backend_debugfs_write_reg() before passing it to sscanf(). It is a
stack variable so we should not assume it will 0 initialized.

The Linux kernel CVE team has assigned CVE-2025-22082 to this issue.


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

	Issue introduced in 6.12 with commit cdf01e0809a4c6c7877ea52401c2a6679df7aed6 and fixed in 6.12.23 with commit df3892e5e861c43d5612728ed259634675b8a71f
	Issue introduced in 6.12 with commit cdf01e0809a4c6c7877ea52401c2a6679df7aed6 and fixed in 6.13.11 with commit 04271a4d2740f98bbe36f82cd3d74677a839d1eb
	Issue introduced in 6.12 with commit cdf01e0809a4c6c7877ea52401c2a6679df7aed6 and fixed in 6.14.2 with commit fd791c81f410ab1c554686a6f486dc7a176dfe35
	Issue introduced in 6.12 with commit cdf01e0809a4c6c7877ea52401c2a6679df7aed6 and fixed in 6.15-rc1 with commit 035b4989211dc1c8626e186d655ae8ca5141bb73

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-2025-22082
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/industrialio-backend.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/df3892e5e861c43d5612728ed259634675b8a71f
	https://git.kernel.org/stable/c/04271a4d2740f98bbe36f82cd3d74677a839d1eb
	https://git.kernel.org/stable/c/fd791c81f410ab1c554686a6f486dc7a176dfe35
	https://git.kernel.org/stable/c/035b4989211dc1c8626e186d655ae8ca5141bb73