linux-cve-announce - CVE-2023-53543: vdpa: Add max vqp attr to vdpa_nl

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <2025100445-CVE-2023-53543-227c@gregkh>
Date: Sat,  4 Oct 2025 17:16:57 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53543: vdpa: Add max vqp 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 max vqp 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 max vqp attr to avoid
such bugs.

The Linux kernel CVE team has assigned CVE-2023-53543 to this issue.


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

	Issue introduced in 5.16 with commit ad69dd0bf26b88ec6ab26f8bbe5cd74fbed7672a and fixed in 6.1.47 with commit ff71709445ac033e6e250d971683110e4781c068
	Issue introduced in 5.16 with commit ad69dd0bf26b88ec6ab26f8bbe5cd74fbed7672a and fixed in 6.4.12 with commit ea65e8b5e6b1a34deda7564f09c90e9e80db436a
	Issue introduced in 5.16 with commit ad69dd0bf26b88ec6ab26f8bbe5cd74fbed7672a and fixed in 6.5 with commit 5d6ba607d6cb5c58a4ddf33381e18c83dbb4098f

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-2023-53543
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/ff71709445ac033e6e250d971683110e4781c068
	https://git.kernel.org/stable/c/ea65e8b5e6b1a34deda7564f09c90e9e80db436a
	https://git.kernel.org/stable/c/5d6ba607d6cb5c58a4ddf33381e18c83dbb4098f