linux-cve-announce - CVE-2025-38484: iio: backend: fix out-of-bound write

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Message-ID: <2025072815-CVE-2025-38484-4faf@gregkh>
Date: Mon, 28 Jul 2025 13:22:26 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38484: iio: backend: fix out-of-bound write

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

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

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

iio: backend: fix out-of-bound write

The buffer is set to 80 character. If a caller write more characters,
count is truncated to the max available space in "simple_write_to_buffer".
But afterwards a string terminator is written to the buffer at offset count
without boundary check. The zero termination is written OUT-OF-BOUND.

Add a check that the given buffer is smaller then the buffer to prevent.

The Linux kernel CVE team has assigned CVE-2025-38484 to this issue.


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

	Issue introduced in 6.12.23 with commit df3892e5e861c43d5612728ed259634675b8a71f and fixed in 6.12.40 with commit 6eea9f7648ddb9e4903735a1f77cf196c957aa38
	Issue introduced in 6.15 with commit 035b4989211dc1c8626e186d655ae8ca5141bb73 and fixed in 6.15.8 with commit 01e941aa7f5175125df4ac5d3aab099961525602
	Issue introduced in 6.15 with commit 035b4989211dc1c8626e186d655ae8ca5141bb73 and fixed in 6.16 with commit da9374819eb3885636934c1006d450c3cb1a02ed
	Issue introduced in 6.13.11 with commit 04271a4d2740f98bbe36f82cd3d74677a839d1eb
	Issue introduced in 6.14.2 with commit fd791c81f410ab1c554686a6f486dc7a176dfe35

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-2025-38484
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/6eea9f7648ddb9e4903735a1f77cf196c957aa38
	https://git.kernel.org/stable/c/01e941aa7f5175125df4ac5d3aab099961525602
	https://git.kernel.org/stable/c/da9374819eb3885636934c1006d450c3cb1a02ed