linux-cve-announce - CVE-2023-53209: wifi: mac80211_hwsim: Fix possible NULL dereference

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Message-ID: <2025091510-CVE-2023-53209-ed9e@gregkh>
Date: Mon, 15 Sep 2025 16:21:43 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53209: wifi: mac80211_hwsim: Fix possible NULL dereference

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

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

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

wifi: mac80211_hwsim: Fix possible NULL dereference

In a call to mac80211_hwsim_select_tx_link() the sta pointer might
be NULL, thus need to check that it is not NULL before accessing it.

The Linux kernel CVE team has assigned CVE-2023-53209 to this issue.


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

	Fixed in 6.1.42 with commit d0124848c7940aba73492e282506b32a13f2e30e
	Fixed in 6.4.7 with commit a8a20fed3e05b3a6866c5c58855deaf3c217ccd6
	Fixed in 6.5 with commit 0cc80943ef518a1c51a1111e9346d1daf11dd545

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-2023-53209
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/wireless/virtual/mac80211_hwsim.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/d0124848c7940aba73492e282506b32a13f2e30e
	https://git.kernel.org/stable/c/a8a20fed3e05b3a6866c5c58855deaf3c217ccd6
	https://git.kernel.org/stable/c/0cc80943ef518a1c51a1111e9346d1daf11dd545