linux-cve-announce - CVE-2025-39935: ASoC: codec: sma1307: Fix memory corruption in sma1307_setting

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Message-ID: <2025100417-CVE-2025-39935-3e6a@gregkh>
Date: Sat,  4 Oct 2025 09:33:19 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-39935: ASoC: codec: sma1307: Fix memory corruption in sma1307_setting_loaded()

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

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

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

ASoC: codec: sma1307: Fix memory corruption in sma1307_setting_loaded()

The sma1307->set.header_size is how many integers are in the header
(there are 8 of them) but instead of allocating space of 8 integers
we allocate 8 bytes.  This leads to memory corruption when we copy data
it on the next line:

        memcpy(sma1307->set.header, data,
               sma1307->set.header_size * sizeof(int));

Also since we're immediately copying over the memory in ->set.header,
there is no need to zero it in the allocator.  Use devm_kmalloc_array()
to allocate the memory instead.

The Linux kernel CVE team has assigned CVE-2025-39935 to this issue.


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

	Issue introduced in 6.13 with commit 576c57e6b4c1d734bcb7cc33dde9a99a9383b520 and fixed in 6.16.9 with commit cd59ca8f75dbb42a67fcae975c766114644e36c4
	Issue introduced in 6.13 with commit 576c57e6b4c1d734bcb7cc33dde9a99a9383b520 and fixed in 6.17 with commit 78338108b5a856dc98223a335f147846a8a18c51

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-2025-39935
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:
	sound/soc/codecs/sma1307.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/cd59ca8f75dbb42a67fcae975c766114644e36c4
	https://git.kernel.org/stable/c/78338108b5a856dc98223a335f147846a8a18c51