linux-cve-announce - CVE-2026-23042: idpf: fix aux device unplugging when rdma is not supported by vport

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Message-ID: <2026020439-CVE-2026-23042-ce47@gregkh>
Date: Wed,  4 Feb 2026 17:00:42 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2026-23042: idpf: fix aux device unplugging when rdma is not supported by vport

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

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

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

idpf: fix aux device unplugging when rdma is not supported by vport

If vport flags do not contain VIRTCHNL2_VPORT_ENABLE_RDMA, driver does not
allocate vdev_info for this vport. This leads to kernel NULL pointer
dereference in idpf_idc_vport_dev_down(), which references vdev_info for
every vport regardless.

Check, if vdev_info was ever allocated before unplugging aux device.

The Linux kernel CVE team has assigned CVE-2026-23042 to this issue.


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

	Issue introduced in 6.17 with commit be91128c579c86d295da4325f6ac4710e4e6d2b4 and fixed in 6.18.6 with commit 0ad6d6e50e9d8bf596cfe77a882ddc20b29f525a
	Issue introduced in 6.17 with commit be91128c579c86d295da4325f6ac4710e4e6d2b4 and fixed in 6.19-rc5 with commit 4648fb2f2e7210c53b85220ee07d42d1e4bae3f9

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-2026-23042
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/net/ethernet/intel/idpf/idpf_idc.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/0ad6d6e50e9d8bf596cfe77a882ddc20b29f525a
	https://git.kernel.org/stable/c/4648fb2f2e7210c53b85220ee07d42d1e4bae3f9