linux-cve-announce - CVE-2025-38509: wifi: mac80211: reject VHT opmode for unsupported channel widths

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Message-ID: <2025081650-CVE-2025-38509-e803@gregkh>
Date: Sat, 16 Aug 2025 12:57:51 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38509: wifi: mac80211: reject VHT opmode for unsupported channel widths

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

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

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

wifi: mac80211: reject VHT opmode for unsupported channel widths

VHT operating mode notifications are not defined for channel widths
below 20 MHz. In particular, 5 MHz and 10 MHz are not valid under the
VHT specification and must be rejected.

Without this check, malformed notifications using these widths may
reach ieee80211_chan_width_to_rx_bw(), leading to a WARN_ON due to
invalid input. This issue was reported by syzbot.

Reject these unsupported widths early in sta_link_apply_parameters()
when opmode_notif is used. The accepted set includes 20, 40, 80, 160,
and 80+80 MHz, which are valid for VHT. While 320 MHz is not defined
for VHT, it is allowed to avoid rejecting HE or EHT clients that may
still send a VHT opmode notification.

The Linux kernel CVE team has assigned CVE-2025-38509 to this issue.

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

	Issue introduced in 6.13 with commit 751e7489c1d74b94ffffbed619d8fd724eeff4ee and fixed in 6.15.7 with commit 18eca59a04500b68a90e0c5c873f97c9d1ea2bfa
	Issue introduced in 6.13 with commit 751e7489c1d74b94ffffbed619d8fd724eeff4ee and fixed in 6.16 with commit 58fcb1b4287ce38850402bb2bb16d09bf77b91d9

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-2025-38509
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/cfg.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/18eca59a04500b68a90e0c5c873f97c9d1ea2bfa
	https://git.kernel.org/stable/c/58fcb1b4287ce38850402bb2bb16d09bf77b91d9