linux-cve-announce - CVE-2025-21909: wifi: nl80211: reject cooked mode if it is set along with other flags

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Message-ID: <2025040129-CVE-2025-21909-90df@gregkh>
Date: Tue,  1 Apr 2025 16:39:33 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-21909: wifi: nl80211: reject cooked mode if it is set along with other flags

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

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

wifi: nl80211: reject cooked mode if it is set along with other flags

It is possible to set both MONITOR_FLAG_COOK_FRAMES and MONITOR_FLAG_ACTIVE
flags simultaneously on the same monitor interface from the userspace. This
causes a sub-interface to be created with no IEEE80211_SDATA_IN_DRIVER bit
set because the monitor interface is in the cooked state and it takes
precedence over all other states. When the interface is then being deleted
the kernel calls WARN_ONCE() from check_sdata_in_driver() because of missing
that bit.

Fix this by rejecting MONITOR_FLAG_COOK_FRAMES if it is set along with
other flags.

Found by Linux Verification Center (linuxtesting.org) with Syzkaller.

The Linux kernel CVE team has assigned CVE-2025-21909 to this issue.


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

	Issue introduced in 2.6.26 with commit 66f7ac50ed7cc5c19a62bc97e8f6e7891004a03a and fixed in 5.4.291 with commit 5ea856d93794c4afa5542defd8c61f2708dc245a
	Issue introduced in 2.6.26 with commit 66f7ac50ed7cc5c19a62bc97e8f6e7891004a03a and fixed in 5.10.235 with commit 351eb7ac53ff1cd94d893c0c4534ced2f36ae7d7
	Issue introduced in 2.6.26 with commit 66f7ac50ed7cc5c19a62bc97e8f6e7891004a03a and fixed in 5.15.179 with commit cd1bdcb77fdc03c253137e55bae10551b3481461
	Issue introduced in 2.6.26 with commit 66f7ac50ed7cc5c19a62bc97e8f6e7891004a03a and fixed in 6.1.131 with commit 236f41ca728f23210b31ed2d1d8a6df575a4b2d6
	Issue introduced in 2.6.26 with commit 66f7ac50ed7cc5c19a62bc97e8f6e7891004a03a and fixed in 6.6.83 with commit ebebbb0eded2ed9a1abfa31962f6fb699e6abce7
	Issue introduced in 2.6.26 with commit 66f7ac50ed7cc5c19a62bc97e8f6e7891004a03a and fixed in 6.12.19 with commit 521e55c2b0d6028861ac0a2d06aa57bb0e3ac486
	Issue introduced in 2.6.26 with commit 66f7ac50ed7cc5c19a62bc97e8f6e7891004a03a and fixed in 6.13.7 with commit ac4860141300581d3e2f6c6dafa37220f7ea9f65
	Issue introduced in 2.6.26 with commit 66f7ac50ed7cc5c19a62bc97e8f6e7891004a03a and fixed in 6.14 with commit 49f27f29446a5bfe633dd2cc0cfebd48a1a5e77f

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-2025-21909
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/wireless/nl80211.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/5ea856d93794c4afa5542defd8c61f2708dc245a
	https://git.kernel.org/stable/c/351eb7ac53ff1cd94d893c0c4534ced2f36ae7d7
	https://git.kernel.org/stable/c/cd1bdcb77fdc03c253137e55bae10551b3481461
	https://git.kernel.org/stable/c/236f41ca728f23210b31ed2d1d8a6df575a4b2d6
	https://git.kernel.org/stable/c/ebebbb0eded2ed9a1abfa31962f6fb699e6abce7
	https://git.kernel.org/stable/c/521e55c2b0d6028861ac0a2d06aa57bb0e3ac486
	https://git.kernel.org/stable/c/ac4860141300581d3e2f6c6dafa37220f7ea9f65
	https://git.kernel.org/stable/c/49f27f29446a5bfe633dd2cc0cfebd48a1a5e77f