cve/published/2025/CVE-2025-37897.mbox

From bippy-1.2.0 Mon Sep 17 00:00:00 2001
From: Greg Kroah-Hartman <gregkh@kernel.org>
To: <linux-cve-announce@vger.kernel.org>
Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org>
Subject: CVE-2025-37897: wifi: plfxlc: Remove erroneous assert in plfxlc_mac_release

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

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

wifi: plfxlc: Remove erroneous assert in plfxlc_mac_release

plfxlc_mac_release() asserts that mac->lock is held. This assertion is
incorrect, because even if it was possible, it would not be the valid
behaviour. The function is used when probe fails or after the device is
disconnected. In both cases mac->lock can not be held as the driver is
not working with the device at the moment. All functions that use mac->lock
unlock it just after it was held. There is also no need to hold mac->lock
for plfxlc_mac_release() itself, as mac data is not affected, except for
mac->flags, which is modified atomically.

This bug leads to the following warning:
================================================================
WARNING: CPU: 0 PID: 127 at drivers/net/wireless/purelifi/plfxlc/mac.c:106 plfxlc_mac_release+0x7d/0xa0
Modules linked in:
CPU: 0 PID: 127 Comm: kworker/0:2 Not tainted 6.1.124-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: usb_hub_wq hub_event
RIP: 0010:plfxlc_mac_release+0x7d/0xa0 drivers/net/wireless/purelifi/plfxlc/mac.c:106
Call Trace:
 <TASK>
 probe+0x941/0xbd0 drivers/net/wireless/purelifi/plfxlc/usb.c:694
 usb_probe_interface+0x5c0/0xaf0 drivers/usb/core/driver.c:396
 really_probe+0x2ab/0xcb0 drivers/base/dd.c:639
 __driver_probe_device+0x1a2/0x3d0 drivers/base/dd.c:785
 driver_probe_device+0x50/0x420 drivers/base/dd.c:815
 __device_attach_driver+0x2cf/0x510 drivers/base/dd.c:943
 bus_for_each_drv+0x183/0x200 drivers/base/bus.c:429
 __device_attach+0x359/0x570 drivers/base/dd.c:1015
 bus_probe_device+0xba/0x1e0 drivers/base/bus.c:489
 device_add+0xb48/0xfd0 drivers/base/core.c:3696
 usb_set_configuration+0x19dd/0x2020 drivers/usb/core/message.c:2165
 usb_generic_driver_probe+0x84/0x140 drivers/usb/core/generic.c:238
 usb_probe_device+0x130/0x260 drivers/usb/core/driver.c:293
 really_probe+0x2ab/0xcb0 drivers/base/dd.c:639
 __driver_probe_device+0x1a2/0x3d0 drivers/base/dd.c:785
 driver_probe_device+0x50/0x420 drivers/base/dd.c:815
 __device_attach_driver+0x2cf/0x510 drivers/base/dd.c:943
 bus_for_each_drv+0x183/0x200 drivers/base/bus.c:429
 __device_attach+0x359/0x570 drivers/base/dd.c:1015
 bus_probe_device+0xba/0x1e0 drivers/base/bus.c:489
 device_add+0xb48/0xfd0 drivers/base/core.c:3696
 usb_new_device+0xbdd/0x18f0 drivers/usb/core/hub.c:2620
 hub_port_connect drivers/usb/core/hub.c:5477 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5617 [inline]
 port_event drivers/usb/core/hub.c:5773 [inline]
 hub_event+0x2efe/0x5730 drivers/usb/core/hub.c:5855
 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
================================================================

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

The Linux kernel CVE team has assigned CVE-2025-37897 to this issue.


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

	Issue introduced in 5.19 with commit 68d57a07bfe5bb29b80cd8b8fa24c9d1ea104124 and fixed in 6.1.138 with commit 93d646911be1e5be20d4f5d6c48359464cef0097
	Issue introduced in 5.19 with commit 68d57a07bfe5bb29b80cd8b8fa24c9d1ea104124 and fixed in 6.6.90 with commit 36a9a2647810e57e704dde59abdf831380ca9102
	Issue introduced in 5.19 with commit 68d57a07bfe5bb29b80cd8b8fa24c9d1ea104124 and fixed in 6.12.28 with commit 791a2d9e87c411aec0b9b2fb735fd15e48af9de9
	Issue introduced in 5.19 with commit 68d57a07bfe5bb29b80cd8b8fa24c9d1ea104124 and fixed in 6.14.6 with commit 9ecb4af39f80cdda3e57825923243ec11e48be6b
	Issue introduced in 5.19 with commit 68d57a07bfe5bb29b80cd8b8fa24c9d1ea104124 and fixed in 6.15 with commit 0fb15ae3b0a9221be01715dac0335647c79f3362

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-2025-37897
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:
	drivers/net/wireless/purelifi/plfxlc/mac.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/93d646911be1e5be20d4f5d6c48359464cef0097
	https://git.kernel.org/stable/c/36a9a2647810e57e704dde59abdf831380ca9102
	https://git.kernel.org/stable/c/791a2d9e87c411aec0b9b2fb735fd15e48af9de9
	https://git.kernel.org/stable/c/9ecb4af39f80cdda3e57825923243ec11e48be6b
	https://git.kernel.org/stable/c/0fb15ae3b0a9221be01715dac0335647c79f3362