CVE-2026-89599: fbdev: omapfb: panel-dsi-cm: initialize lock before registering display

CVE-2026-89599: fbdev: omapfb: panel-dsi-cm: initialize lock before registering display

[Greg Kroah-Hartman]

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

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

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

fbdev: omapfb: panel-dsi-cm: initialize lock before registering display

dsicm_probe() registers the display before initializing ddata->lock.
Once omapdss_register_display() publishes the display, another consumer
can reach a dsicm callback that takes this mutex while it is still
uninitialized.

Initialize the mutex before registering the display so the published
callbacks always see a valid lock.

The Linux kernel CVE team has assigned CVE-2026-89599 to this issue.


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

	Issue introduced in 4.5 with commit f76ee892a99e68b55402b8d4b8aeffcae2aff34d and fixed in 6.12.109 with commit 2c3f8c9c995db185284b079f39177e85b2258176
	Issue introduced in 4.5 with commit f76ee892a99e68b55402b8d4b8aeffcae2aff34d and fixed in 6.18.50 with commit 76818e81cfcae33b09b739de09162c7d8d89bf0b
	Issue introduced in 4.5 with commit f76ee892a99e68b55402b8d4b8aeffcae2aff34d and fixed in 7.2.4 with commit 09db79078f25c048cfb5d7849795c70415ab8574
	Issue introduced in 4.5 with commit f76ee892a99e68b55402b8d4b8aeffcae2aff34d and fixed in 7.3-rc1 with commit f8e43fe0f22b7137ce456e6fe3581d3098174f74

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-2026-89599
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/video/fbdev/omap2/omapfb/displays/panel-dsi-cm.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/2c3f8c9c995db185284b079f39177e85b2258176
	https://git.kernel.org/stable/c/76818e81cfcae33b09b739de09162c7d8d89bf0b
	https://git.kernel.org/stable/c/09db79078f25c048cfb5d7849795c70415ab8574
	https://git.kernel.org/stable/c/f8e43fe0f22b7137ce456e6fe3581d3098174f74