CVE-2026-43317: most: core: fix leak on early registration failure

CVE-2026-43317: most: core: fix leak on early registration failure

[Greg Kroah-Hartman]

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

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

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

most: core: fix leak on early registration failure

A recent commit fixed a resource leak on early registration failures but
for some reason left out the first error path which still leaks the
resources associated with the interface.

Fix up also the first error path so that the interface is always
released on errors.

The Linux kernel CVE team has assigned CVE-2026-43317 to this issue.


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

	Issue introduced in 5.6 with commit 723de0f9171eeb49a3ae98cae82ebbbb992b3a7c and fixed in 6.12.75 with commit bbfe49ffb892bddf32c34bea95b7ff0fc30affb5
	Issue introduced in 5.6 with commit 723de0f9171eeb49a3ae98cae82ebbbb992b3a7c and fixed in 6.18.16 with commit f1ba620f9e8d7291f80c0554e4b820f5fb30e819
	Issue introduced in 5.6 with commit 723de0f9171eeb49a3ae98cae82ebbbb992b3a7c and fixed in 6.19.6 with commit 5fd4396c2e48e90cc2597a86c18227d56ea845f0
	Issue introduced in 5.6 with commit 723de0f9171eeb49a3ae98cae82ebbbb992b3a7c and fixed in 7.0 with commit 2c198c272f9c9213b0fdf6b4a879f445c574f416

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-2026-43317
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/most/core.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/bbfe49ffb892bddf32c34bea95b7ff0fc30affb5
	https://git.kernel.org/stable/c/f1ba620f9e8d7291f80c0554e4b820f5fb30e819
	https://git.kernel.org/stable/c/5fd4396c2e48e90cc2597a86c18227d56ea845f0
	https://git.kernel.org/stable/c/2c198c272f9c9213b0fdf6b4a879f445c574f416