CVE-2026-68215: media: radio-si476x: Unregister v4l2_device on probe failure

From: Greg Kroah-Hartman <[email protected]>

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

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

media: radio-si476x: Unregister v4l2_device on probe failure

si476x_radio_probe() registers radio->v4l2dev before allocating the V4L2
controls and before registering the video device. If any of those later
steps fails, probe returns through the exit label after freeing only the
control handler.

A failed probe does not call si476x_radio_remove(), so the
v4l2_device_unregister() there is not reached. This leaves the parent
device reference taken by v4l2_device_register() behind on the error path.

Unregister the V4L2 device in the probe error path after freeing the
controls.

The Linux kernel CVE team has assigned CVE-2026-68215 to this issue.


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

	Issue introduced in 3.10 with commit b879a9c2a755d4ddf9e685258de6435710fd2f03 and fixed in 6.6.148 with commit 4ca9c9f12b1bc341a0a3bbbd2090fd182db53771
	Issue introduced in 3.10 with commit b879a9c2a755d4ddf9e685258de6435710fd2f03 and fixed in 6.12.101 with commit 7ef9f1659404544a8dddd68842bafcb4a38197af
	Issue introduced in 3.10 with commit b879a9c2a755d4ddf9e685258de6435710fd2f03 and fixed in 6.18.42 with commit 64cb15878b35e5574ff4f80a0b613a79e47867ba
	Issue introduced in 3.10 with commit b879a9c2a755d4ddf9e685258de6435710fd2f03 and fixed in 7.1.6 with commit 730c235d7d2c80a401dac56b0f5066c889aa442d
	Issue introduced in 3.10 with commit b879a9c2a755d4ddf9e685258de6435710fd2f03 and fixed in 7.2-rc1 with commit 436a693af04ffb889aaf87cb69ec1f2b21d3569c

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-2026-68215
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/radio/radio-si476x.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/4ca9c9f12b1bc341a0a3bbbd2090fd182db53771
	https://git.kernel.org/stable/c/7ef9f1659404544a8dddd68842bafcb4a38197af
	https://git.kernel.org/stable/c/64cb15878b35e5574ff4f80a0b613a79e47867ba
	https://git.kernel.org/stable/c/730c235d7d2c80a401dac56b0f5066c889aa442d
	https://git.kernel.org/stable/c/436a693af04ffb889aaf87cb69ec1f2b21d3569c