linux-cve-announce - CVE-2022-49942: wifi: mac80211: Don't finalize CSA in IBSS mode if state is disconnected

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Message-ID: <2025061807-CVE-2022-49942-8f93@gregkh>
Date: Wed, 18 Jun 2025 13:00:07 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-49942: wifi: mac80211: Don't finalize CSA in IBSS mode if state is disconnected

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

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

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

wifi: mac80211: Don't finalize CSA in IBSS mode if state is disconnected

When we are not connected to a channel, sending channel "switch"
announcement doesn't make any sense.

The BSS list is empty in that case. This causes the for loop in
cfg80211_get_bss() to be bypassed, so the function returns NULL
(check line 1424 of net/wireless/scan.c), causing the WARN_ON()
in ieee80211_ibss_csa_beacon() to get triggered (check line 500
of net/mac80211/ibss.c), which was consequently reported on the
syzkaller dashboard.

Thus, check if we have an existing connection before generating
the CSA beacon in ieee80211_ibss_finish_csa().

The Linux kernel CVE team has assigned CVE-2022-49942 to this issue.


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

	Issue introduced in 3.13 with commit cd7760e62c2ac8581f050b2d36501d1a60beaf83 and fixed in 4.9.328 with commit cdb9a8da9b84800eb15506cd9363cf0cf059e677
	Issue introduced in 3.13 with commit cd7760e62c2ac8581f050b2d36501d1a60beaf83 and fixed in 4.14.293 with commit 1691a48aef0a82d1754b9853dae7e3f5cacdf70b
	Issue introduced in 3.13 with commit cd7760e62c2ac8581f050b2d36501d1a60beaf83 and fixed in 4.19.258 with commit d9eb37db6a28b59a95a3461450ee209654c5f95b
	Issue introduced in 3.13 with commit cd7760e62c2ac8581f050b2d36501d1a60beaf83 and fixed in 5.4.213 with commit 66689c5c02acd4d76c28498fe220998610aec61e
	Issue introduced in 3.13 with commit cd7760e62c2ac8581f050b2d36501d1a60beaf83 and fixed in 5.10.142 with commit dd649b49219a0388cc10fc40e4c2ea681566a780
	Issue introduced in 3.13 with commit cd7760e62c2ac8581f050b2d36501d1a60beaf83 and fixed in 5.15.66 with commit 552ba102a6898630a7d16887f29e606d6fabe508
	Issue introduced in 3.13 with commit cd7760e62c2ac8581f050b2d36501d1a60beaf83 and fixed in 5.19.8 with commit 864e280cb3a9a0f5212b16ef5057c4e692f7039d
	Issue introduced in 3.13 with commit cd7760e62c2ac8581f050b2d36501d1a60beaf83 and fixed in 6.0 with commit 15bc8966b6d3a5b9bfe4c9facfa02f2b69b1e5f0

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-2022-49942
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/ibss.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/cdb9a8da9b84800eb15506cd9363cf0cf059e677
	https://git.kernel.org/stable/c/1691a48aef0a82d1754b9853dae7e3f5cacdf70b
	https://git.kernel.org/stable/c/d9eb37db6a28b59a95a3461450ee209654c5f95b
	https://git.kernel.org/stable/c/66689c5c02acd4d76c28498fe220998610aec61e
	https://git.kernel.org/stable/c/dd649b49219a0388cc10fc40e4c2ea681566a780
	https://git.kernel.org/stable/c/552ba102a6898630a7d16887f29e606d6fabe508
	https://git.kernel.org/stable/c/864e280cb3a9a0f5212b16ef5057c4e692f7039d
	https://git.kernel.org/stable/c/15bc8966b6d3a5b9bfe4c9facfa02f2b69b1e5f0