linux-cve-announce - CVE-2022-50181: virtio-gpu: fix a missing check to avoid NULL dereference

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Message-ID: <2025061833-CVE-2022-50181-f573@gregkh>
Date: Wed, 18 Jun 2025 13:04:06 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50181: virtio-gpu: fix a missing check to avoid NULL dereference

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

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

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

virtio-gpu: fix a missing check to avoid NULL dereference

'cache_ent' could be set NULL inside virtio_gpu_cmd_get_capset()
and it will lead to a NULL dereference by a lately use of it
(i.e., ptr = cache_ent->caps_cache). Fix it with a NULL check.


[ kraxel: minor codestyle fixup ]

The Linux kernel CVE team has assigned CVE-2022-50181 to this issue.


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

	Issue introduced in 4.4 with commit 62fb7a5e10962ac6ae2a2d2dbd3aedcb2a3e3257 and fixed in 5.10.137 with commit 259773fc874258606c0121767a4a27466ff337eb
	Issue introduced in 4.4 with commit 62fb7a5e10962ac6ae2a2d2dbd3aedcb2a3e3257 and fixed in 5.15.61 with commit 39caef09666c1d8274abf9472c72bcac236dc5fb
	Issue introduced in 4.4 with commit 62fb7a5e10962ac6ae2a2d2dbd3aedcb2a3e3257 and fixed in 5.18.18 with commit adbdd21983fa292e53aec3eab97306b2961ea887
	Issue introduced in 4.4 with commit 62fb7a5e10962ac6ae2a2d2dbd3aedcb2a3e3257 and fixed in 5.19.2 with commit 367882a5a9448b5e1ba756125308092d614cb96c
	Issue introduced in 4.4 with commit 62fb7a5e10962ac6ae2a2d2dbd3aedcb2a3e3257 and fixed in 6.0 with commit bd63f11f4c3c46afec07d821f74736161ff6e526

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-2022-50181
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/gpu/drm/virtio/virtgpu_ioctl.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/259773fc874258606c0121767a4a27466ff337eb
	https://git.kernel.org/stable/c/39caef09666c1d8274abf9472c72bcac236dc5fb
	https://git.kernel.org/stable/c/adbdd21983fa292e53aec3eab97306b2961ea887
	https://git.kernel.org/stable/c/367882a5a9448b5e1ba756125308092d614cb96c
	https://git.kernel.org/stable/c/bd63f11f4c3c46afec07d821f74736161ff6e526