linux-cve-announce - CVE-2024-53092: virtio_pci: Fix admin vq cleanup by using correct info pointer

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Message-ID: <2024112152-CVE-2024-53092-0060@gregkh>
Date: Thu, 21 Nov 2024 19:16:53 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-53092: virtio_pci: Fix admin vq cleanup by using correct info pointer

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

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

virtio_pci: Fix admin vq cleanup by using correct info pointer

vp_modern_avq_cleanup() and vp_del_vqs() clean up admin vq
resources by virtio_pci_vq_info pointer. The info pointer of admin
vq is stored in vp_dev->admin_vq.info instead of vp_dev->vqs[].
Using the info pointer from vp_dev->vqs[] for admin vq causes a
kernel NULL pointer dereference bug.
In vp_modern_avq_cleanup() and vp_del_vqs(), get the info pointer
from vp_dev->admin_vq.info for admin vq to clean up the resources.
Also make info ptr as argument of vp_del_vq() to be symmetric with
vp_setup_vq().

vp_reset calls vp_modern_avq_cleanup, and causes the Call Trace:
==================================================================
BUG: kernel NULL pointer dereference, address:0000000000000000
...
CPU: 49 UID: 0 PID: 4439 Comm: modprobe Not tainted 6.11.0-rc5 #1
RIP: 0010:vp_reset+0x57/0x90 [virtio_pci]
Call Trace:
 <TASK>
...
 ? vp_reset+0x57/0x90 [virtio_pci]
 ? vp_reset+0x38/0x90 [virtio_pci]
 virtio_reset_device+0x1d/0x30
 remove_vq_common+0x1c/0x1a0 [virtio_net]
 virtnet_remove+0xa1/0xc0 [virtio_net]
 virtio_dev_remove+0x46/0xa0
...
 virtio_pci_driver_exit+0x14/0x810 [virtio_pci]
==================================================================

The Linux kernel CVE team has assigned CVE-2024-53092 to this issue.


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

	Issue introduced in 6.11 with commit 4c3b54af907e and fixed in 6.11.9 with commit 018d3d4ad4be
	Issue introduced in 6.11 with commit 4c3b54af907e and fixed in 6.12 with commit 97ee04feb682

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-2024-53092
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/virtio/virtio_pci_common.c
	drivers/virtio/virtio_pci_common.h
	drivers/virtio/virtio_pci_modern.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/018d3d4ad4be7fbc95d8a2367642a32d21df55c7
	https://git.kernel.org/stable/c/97ee04feb682c906a1fa973ebe586fe91567d165