linux-cve-announce - CVE-2025-38643: wifi: cfg80211: Add missing lock in cfg80211_check_and_end

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Message-ID: <2025082235-CVE-2025-38643-a281@gregkh>
Date: Fri, 22 Aug 2025 18:00:51 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38643: wifi: cfg80211: Add missing lock in cfg80211_check_and_end_cac()

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

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

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

wifi: cfg80211: Add missing lock in cfg80211_check_and_end_cac()

Callers of wdev_chandef() must hold the wiphy mutex.

But the worker cfg80211_propagate_cac_done_wk() never takes the lock.
Which triggers the warning below with the mesh_peer_connected_dfs
test from hostapd and not (yet) released mac80211 code changes:

WARNING: CPU: 0 PID: 495 at net/wireless/chan.c:1552 wdev_chandef+0x60/0x165
Modules linked in:
CPU: 0 UID: 0 PID: 495 Comm: kworker/u4:2 Not tainted 6.14.0-rc5-wt-g03960e6f9d47 #33 13c287eeabfe1efea01c0bcc863723ab082e17cf
Workqueue: cfg80211 cfg80211_propagate_cac_done_wk
Stack:
 00000000 00000001 ffffff00 6093267c
 00000000 6002ec30 6d577c50 60037608
 00000000 67e8d108 6063717b 00000000
Call Trace:
 [<6002ec30>] ? _printk+0x0/0x98
 [<6003c2b3>] show_stack+0x10e/0x11a
 [<6002ec30>] ? _printk+0x0/0x98
 [<60037608>] dump_stack_lvl+0x71/0xb8
 [<6063717b>] ? wdev_chandef+0x60/0x165
 [<6003766d>] dump_stack+0x1e/0x20
 [<6005d1b7>] __warn+0x101/0x20f
 [<6005d3a8>] warn_slowpath_fmt+0xe3/0x15d
 [<600b0c5c>] ? mark_lock.part.0+0x0/0x4ec
 [<60751191>] ? __this_cpu_preempt_check+0x0/0x16
 [<600b11a2>] ? mark_held_locks+0x5a/0x6e
 [<6005d2c5>] ? warn_slowpath_fmt+0x0/0x15d
 [<60052e53>] ? unblock_signals+0x3a/0xe7
 [<60052f2d>] ? um_set_signals+0x2d/0x43
 [<60751191>] ? __this_cpu_preempt_check+0x0/0x16
 [<607508b2>] ? lock_is_held_type+0x207/0x21f
 [<6063717b>] wdev_chandef+0x60/0x165
 [<605f89b4>] regulatory_propagate_dfs_state+0x247/0x43f
 [<60052f00>] ? um_set_signals+0x0/0x43
 [<605e6bfd>] cfg80211_propagate_cac_done_wk+0x3a/0x4a
 [<6007e460>] process_scheduled_works+0x3bc/0x60e
 [<6007d0ec>] ? move_linked_works+0x4d/0x81
 [<6007d120>] ? assign_work+0x0/0xaa
 [<6007f81f>] worker_thread+0x220/0x2dc
 [<600786ef>] ? set_pf_worker+0x0/0x57
 [<60087c96>] ? to_kthread+0x0/0x43
 [<6008ab3c>] kthread+0x2d3/0x2e2
 [<6007f5ff>] ? worker_thread+0x0/0x2dc
 [<6006c05b>] ? calculate_sigpending+0x0/0x56
 [<6003b37d>] new_thread_handler+0x4a/0x64
irq event stamp: 614611
hardirqs last  enabled at (614621): [<00000000600bc96b>] __up_console_sem+0x82/0xaf
hardirqs last disabled at (614630): [<00000000600bc92c>] __up_console_sem+0x43/0xaf
softirqs last  enabled at (614268): [<00000000606c55c6>] __ieee80211_wake_queue+0x933/0x985
softirqs last disabled at (614266): [<00000000606c52d6>] __ieee80211_wake_queue+0x643/0x985

The Linux kernel CVE team has assigned CVE-2025-38643 to this issue.


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

	Issue introduced in 5.5 with commit 26ec17a1dc5ecdd8d91aba63ead6f8b5ad5dea0d and fixed in 6.15.10 with commit 7022df2248c08c6f75a01714163ac902333bf3db
	Issue introduced in 5.5 with commit 26ec17a1dc5ecdd8d91aba63ead6f8b5ad5dea0d and fixed in 6.16.1 with commit dbce810607726408f889d3358f4780fd1436861e
	Issue introduced in 5.5 with commit 26ec17a1dc5ecdd8d91aba63ead6f8b5ad5dea0d and fixed in 6.17-rc1 with commit 2c5dee15239f3f3e31aa5c8808f18996c039e2c1
	Issue introduced in 4.14.170 with commit 2dbb6faebb94d6d5ae87e5ea6be9280c366393e1
	Issue introduced in 4.19.102 with commit a4f85674e4693904ade7cbf6722d0d105d8062d8
	Issue introduced in 5.4.18 with commit e233cbaf8ecc5859f0417dd53899da4edb477991

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-2025-38643
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/reg.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/7022df2248c08c6f75a01714163ac902333bf3db
	https://git.kernel.org/stable/c/dbce810607726408f889d3358f4780fd1436861e
	https://git.kernel.org/stable/c/2c5dee15239f3f3e31aa5c8808f18996c039e2c1