linux-cve-announce - CVE-2022-50533: wifi: mac80211: mlme: fix null-ptr deref on failed assoc

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: <2025100708-CVE-2022-50533-7dfc@gregkh>
Date: Tue,  7 Oct 2025 17:19:20 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50533: wifi: mac80211: mlme: fix null-ptr deref on failed assoc

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

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

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

wifi: mac80211: mlme: fix null-ptr deref on failed assoc

If association to an AP without a link 0 fails, then we crash in
tracing because it assumes that either ap_mld_addr or link 0 BSS
is valid, since we clear sdata->vif.valid_links and then don't
add the ap_mld_addr to the struct.

Since we clear also sdata->vif.cfg.ap_addr, keep a local copy of
it and assign it earlier, before clearing valid_links, to fix
this.

The Linux kernel CVE team has assigned CVE-2022-50533 to this issue.


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

	Issue introduced in 6.0 with commit 81151ce462e533551f3284bfdb8e0f461c9220e6 and fixed in 6.0.16 with commit c695dfba8dfb82dc7ace4f22be088916cbf621ca
	Issue introduced in 6.0 with commit 81151ce462e533551f3284bfdb8e0f461c9220e6 and fixed in 6.1.2 with commit bb7743955a929e44b308cc3f63f8cc03873c1bee
	Issue introduced in 6.0 with commit 81151ce462e533551f3284bfdb8e0f461c9220e6 and fixed in 6.2 with commit 78a6a43aaf87180ec7425a2a90468e1b4d09a1ec

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-2022-50533
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:
	net/mac80211/mlme.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/c695dfba8dfb82dc7ace4f22be088916cbf621ca
	https://git.kernel.org/stable/c/bb7743955a929e44b308cc3f63f8cc03873c1bee
	https://git.kernel.org/stable/c/78a6a43aaf87180ec7425a2a90468e1b4d09a1ec