linux-cve-announce - CVE-2025-68327: usb: renesas_usbhs: Fix synchronous external abort on unbind

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Message-ID: <2025122229-CVE-2025-68327-9c6e@gregkh>
Date: Mon, 22 Dec 2025 17:12:29 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-68327: usb: renesas_usbhs: Fix synchronous external abort on unbind

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

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

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

usb: renesas_usbhs: Fix synchronous external abort on unbind

A synchronous external abort occurs on the Renesas RZ/G3S SoC if unbind is
executed after the configuration sequence described above:

modprobe usb_f_ecm
modprobe libcomposite
modprobe configfs
cd /sys/kernel/config/usb_gadget
mkdir -p g1
cd g1
echo "0x1d6b" > idVendor
echo "0x0104" > idProduct
mkdir -p strings/0x409
echo "0123456789" > strings/0x409/serialnumber
echo "Renesas." > strings/0x409/manufacturer
echo "Ethernet Gadget" > strings/0x409/product
mkdir -p functions/ecm.usb0
mkdir -p configs/c.1
mkdir -p configs/c.1/strings/0x409
echo "ECM" > configs/c.1/strings/0x409/configuration

if [ ! -L configs/c.1/ecm.usb0 ]; then
        ln -s functions/ecm.usb0 configs/c.1
fi

echo 11e20000.usb > UDC
echo 11e20000.usb > /sys/bus/platform/drivers/renesas_usbhs/unbind

The displayed trace is as follows:

 Internal error: synchronous external abort: 0000000096000010 [#1] SMP
 CPU: 0 UID: 0 PID: 188 Comm: sh Tainted: G M 6.17.0-rc7-next-20250922-00010-g41050493b2bd #55 PREEMPT
 Tainted: [M]=MACHINE_CHECK
 Hardware name: Renesas SMARC EVK version 2 based on r9a08g045s33 (DT)
 pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
 pc : usbhs_sys_function_pullup+0x10/0x40 [renesas_usbhs]
 lr : usbhsg_update_pullup+0x3c/0x68 [renesas_usbhs]
 sp : ffff8000838b3920
 x29: ffff8000838b3920 x28: ffff00000d585780 x27: 0000000000000000
 x26: 0000000000000000 x25: 0000000000000000 x24: ffff00000c3e3810
 x23: ffff00000d5e5c80 x22: ffff00000d5e5d40 x21: 0000000000000000
 x20: 0000000000000000 x19: ffff00000d5e5c80 x18: 0000000000000020
 x17: 2e30303230316531 x16: 312d7968703a7968 x15: 3d454d414e5f4344
 x14: 000000000000002c x13: 0000000000000000 x12: 0000000000000000
 x11: ffff00000f358f38 x10: ffff00000f358db0 x9 : ffff00000b41f418
 x8 : 0101010101010101 x7 : 7f7f7f7f7f7f7f7f x6 : fefefeff6364626d
 x5 : 8080808000000000 x4 : 000000004b5ccb9d x3 : 0000000000000000
 x2 : 0000000000000000 x1 : ffff800083790000 x0 : ffff00000d5e5c80
 Call trace:
 usbhs_sys_function_pullup+0x10/0x40 [renesas_usbhs] (P)
 usbhsg_pullup+0x4c/0x7c [renesas_usbhs]
 usb_gadget_disconnect_locked+0x48/0xd4
 gadget_unbind_driver+0x44/0x114
 device_remove+0x4c/0x80
 device_release_driver_internal+0x1c8/0x224
 device_release_driver+0x18/0x24
 bus_remove_device+0xcc/0x10c
 device_del+0x14c/0x404
 usb_del_gadget+0x88/0xc0
 usb_del_gadget_udc+0x18/0x30
 usbhs_mod_gadget_remove+0x24/0x44 [renesas_usbhs]
 usbhs_mod_remove+0x20/0x30 [renesas_usbhs]
 usbhs_remove+0x98/0xdc [renesas_usbhs]
 platform_remove+0x20/0x30
 device_remove+0x4c/0x80
 device_release_driver_internal+0x1c8/0x224
 device_driver_detach+0x18/0x24
 unbind_store+0xb4/0xb8
 drv_attr_store+0x24/0x38
 sysfs_kf_write+0x7c/0x94
 kernfs_fop_write_iter+0x128/0x1b8
 vfs_write+0x2ac/0x350
 ksys_write+0x68/0xfc
 __arm64_sys_write+0x1c/0x28
 invoke_syscall+0x48/0x110
 el0_svc_common.constprop.0+0xc0/0xe0
 do_el0_svc+0x1c/0x28
 el0_svc+0x34/0xf0
 el0t_64_sync_handler+0xa0/0xe4
 el0t_64_sync+0x198/0x19c
 Code: 7100003f 1a9f07e1 531c6c22 f9400001 (79400021)
 ---[ end trace 0000000000000000 ]---
 note: sh[188] exited with irqs disabled
 note: sh[188] exited with preempt_count 1

The issue occurs because usbhs_sys_function_pullup(), which accesses the IP
registers, is executed after the USBHS clocks have been disabled. The
problem is reproducible on the Renesas RZ/G3S SoC starting with the
addition of module stop in the clock enable/disable APIs. With module stop
functionality enabled, a bus error is expected if a master accesses a
module whose clock has been stopped and module stop activated.

Disable the IP clocks at the end of remove.

The Linux kernel CVE team has assigned CVE-2025-68327 to this issue.


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

	Issue introduced in 3.0 with commit f1407d5c66240b33d11a7f1a41d55ccf6a9d7647 and fixed in 5.10.247 with commit fd1a7bf3a8cac13f6d2d52d8c7570ba41621db9a
	Issue introduced in 3.0 with commit f1407d5c66240b33d11a7f1a41d55ccf6a9d7647 and fixed in 5.15.197 with commit cd5e86e34c66a831b5cb9b720ad411a006962cc8
	Issue introduced in 3.0 with commit f1407d5c66240b33d11a7f1a41d55ccf6a9d7647 and fixed in 6.1.159 with commit 230b1bc1310edcd5c1b71dcd6b77ccba43139cb5
	Issue introduced in 3.0 with commit f1407d5c66240b33d11a7f1a41d55ccf6a9d7647 and fixed in 6.6.119 with commit 9d86bc8b188a77c8d6f7252280ec2bd24ad6fbc1
	Issue introduced in 3.0 with commit f1407d5c66240b33d11a7f1a41d55ccf6a9d7647 and fixed in 6.12.61 with commit 26838f147aeaa8f820ff799d72815fba5e209bd9
	Issue introduced in 3.0 with commit f1407d5c66240b33d11a7f1a41d55ccf6a9d7647 and fixed in 6.17.11 with commit aa658a6d5ac21c7cde54c6d015f2d4daff32e02d
	Issue introduced in 3.0 with commit f1407d5c66240b33d11a7f1a41d55ccf6a9d7647 and fixed in 6.18 with commit eb9ac779830b2235847b72cb15cf07c7e3333c5e

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-2025-68327
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/usb/renesas_usbhs/common.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/fd1a7bf3a8cac13f6d2d52d8c7570ba41621db9a
	https://git.kernel.org/stable/c/cd5e86e34c66a831b5cb9b720ad411a006962cc8
	https://git.kernel.org/stable/c/230b1bc1310edcd5c1b71dcd6b77ccba43139cb5
	https://git.kernel.org/stable/c/9d86bc8b188a77c8d6f7252280ec2bd24ad6fbc1
	https://git.kernel.org/stable/c/26838f147aeaa8f820ff799d72815fba5e209bd9
	https://git.kernel.org/stable/c/aa658a6d5ac21c7cde54c6d015f2d4daff32e02d
	https://git.kernel.org/stable/c/eb9ac779830b2235847b72cb15cf07c7e3333c5e