linux-cve-announce - CVE-2025-40221: media: pci: mg4b: fix uninitialized iio scan data

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Message-ID: <2025120454-CVE-2025-40221-e3f3@gregkh>
Date: Thu,  4 Dec 2025 15:50:55 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-40221: media: pci: mg4b: fix uninitialized iio scan data

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

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

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

media: pci: mg4b: fix uninitialized iio scan data

Fix potential leak of uninitialized stack data to userspace by ensuring
that the `scan` structure is zeroed before use.

The Linux kernel CVE team has assigned CVE-2025-40221 to this issue.


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

	Issue introduced in 6.7 with commit 0ab13674a9bd10514486cf1670d71dbd8afec421 and fixed in 6.12.54 with commit b7f82da7f86479cb6479a76ebe213ece7c77398f
	Issue introduced in 6.7 with commit 0ab13674a9bd10514486cf1670d71dbd8afec421 and fixed in 6.17.4 with commit b792eba44494b4e6ab5006013335f9819f303b8b
	Issue introduced in 6.7 with commit 0ab13674a9bd10514486cf1670d71dbd8afec421 and fixed in 6.18 with commit c0d3f6969bb4d72476cfe7ea9263831f1c283704

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-2025-40221
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/media/pci/mgb4/mgb4_trigger.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/b7f82da7f86479cb6479a76ebe213ece7c77398f
	https://git.kernel.org/stable/c/b792eba44494b4e6ab5006013335f9819f303b8b
	https://git.kernel.org/stable/c/c0d3f6969bb4d72476cfe7ea9263831f1c283704