CVE-2026-89597: fbdev: uvesafb: unregister connector callback on init failure

CVE-2026-89597: fbdev: uvesafb: unregister connector callback on init failure

[Greg Kroah-Hartman]

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

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

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

fbdev: uvesafb: unregister connector callback on init failure

uvesafb_init() registers the v86d connector callback before registering
the platform driver. If platform_driver_register() fails, the function
returns the error directly and leaves the connector callback registered.

The later platform-device failure path already unregisters the callback.
Add the same cleanup before the final return when platform-driver
registration fails.

This issue was identified during our ongoing static-analysis research while
reviewing kernel code.

The Linux kernel CVE team has assigned CVE-2026-89597 to this issue.


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

	Issue introduced in 2.6.24 with commit 8bdb3a2d7df48b861972c4bfb58490853a228f51 and fixed in 6.12.109 with commit 9f8a822b44c42502f105cf6574f4867067eecdd0
	Issue introduced in 2.6.24 with commit 8bdb3a2d7df48b861972c4bfb58490853a228f51 and fixed in 6.18.50 with commit 466a8af0dee2cf745307155e26884e19a37b7e15
	Issue introduced in 2.6.24 with commit 8bdb3a2d7df48b861972c4bfb58490853a228f51 and fixed in 7.2.4 with commit 9e768ae51426af2034d479133cfd73010d641b1a
	Issue introduced in 2.6.24 with commit 8bdb3a2d7df48b861972c4bfb58490853a228f51 and fixed in 7.3-rc1 with commit de8db23aa7c337e606fca9faf48b3ba72968597a

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-2026-89597
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/uvesafb.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/9f8a822b44c42502f105cf6574f4867067eecdd0
	https://git.kernel.org/stable/c/466a8af0dee2cf745307155e26884e19a37b7e15
	https://git.kernel.org/stable/c/9e768ae51426af2034d479133cfd73010d641b1a
	https://git.kernel.org/stable/c/de8db23aa7c337e606fca9faf48b3ba72968597a