linux-cve-announce - CVE-2023-53652: vdpa: Add features attr to vdpa_nl

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Message-ID: <2025100719-CVE-2023-53652-d67a@gregkh>
Date: Tue,  7 Oct 2025 17:19:57 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53652: vdpa: Add features attr to vdpa_nl_policy for nlattr length check

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

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

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

vdpa: Add features attr to vdpa_nl_policy for nlattr length check

The vdpa_nl_policy structure is used to validate the nlattr when parsing
the incoming nlmsg. It will ensure the attribute being described produces
a valid nlattr pointer in info->attrs before entering into each handler
in vdpa_nl_ops.

That is to say, the missing part in vdpa_nl_policy may lead to illegal
nlattr after parsing, which could lead to OOB read just like CVE-2023-3773.

This patch adds the missing nla_policy for vdpa features attr to avoid
such bugs.

The Linux kernel CVE team has assigned CVE-2023-53652 to this issue.


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

	Issue introduced in 6.1 with commit 90fea5a800c3dd80fb8ad9a02929bcef5fde42b8 and fixed in 6.1.47 with commit 44b508cc96889e61799cc0fc6c00766a54f3ab5a
	Issue introduced in 6.1 with commit 90fea5a800c3dd80fb8ad9a02929bcef5fde42b8 and fixed in 6.4.12 with commit 645d17e06c502e71b880b2b854930e5a64014640
	Issue introduced in 6.1 with commit 90fea5a800c3dd80fb8ad9a02929bcef5fde42b8 and fixed in 6.5 with commit 79c8651587504ba263d2fd67fd4406240fb21f69

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-2023-53652
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/vdpa/vdpa.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/44b508cc96889e61799cc0fc6c00766a54f3ab5a
	https://git.kernel.org/stable/c/645d17e06c502e71b880b2b854930e5a64014640
	https://git.kernel.org/stable/c/79c8651587504ba263d2fd67fd4406240fb21f69