CVE-2026-46258: gpio: cdev: Avoid NULL dereference in linehandle_create()

CVE-2026-46258: gpio: cdev: Avoid NULL dereference in linehandle_create()

[Greg Kroah-Hartman]

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

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

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

gpio: cdev: Avoid NULL dereference in linehandle_create()

In linehandle_create(), there is a statement like this:
  retain_and_null_ptr(lh);

Soon after, there is a debug printout that dereferences "lh", which
will crash things.

Avoid the crash by using handlereq.lines, which is the same value.

The Linux kernel CVE team has assigned CVE-2026-46258 to this issue.


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

	Issue introduced in 6.19 with commit da7e394bf58f94e9783379fef7c7fb4411b03208 and fixed in 6.19.4 with commit 87b9d7a4cfbed5f42af440372026270af997c766
	Issue introduced in 6.19 with commit da7e394bf58f94e9783379fef7c7fb4411b03208 and fixed in 7.0 with commit 6af6be278e3ba2ffb6af5b796c89dfb3f5d9063e

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-2026-46258
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/gpio/gpiolib-cdev.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/87b9d7a4cfbed5f42af440372026270af997c766
	https://git.kernel.org/stable/c/6af6be278e3ba2ffb6af5b796c89dfb3f5d9063e