linux-cve-announce - CVE-2023-53693: USB: gadget: Fix the memory leak in raw

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Message-ID: <2025102210-CVE-2023-53693-57fe@gregkh>
Date: Wed, 22 Oct 2025 15:24:32 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53693: USB: gadget: Fix the memory leak in raw_gadget driver

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

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

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

USB: gadget: Fix the memory leak in raw_gadget driver

Currently, increasing raw_dev->count happens before invoke the
raw_queue_event(), if the raw_queue_event() return error, invoke
raw_release() will not trigger the dev_free() to be called.

[  268.905865][ T5067] raw-gadget.0 gadget.0: failed to queue event
[  268.912053][ T5067] udc dummy_udc.0: failed to start USB Raw Gadget: -12
[  268.918885][ T5067] raw-gadget.0: probe of gadget.0 failed with error -12
[  268.925956][ T5067] UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy
[  268.934657][ T5067] misc raw-gadget: fail, usb_gadget_register_driver returned -16

BUG: memory leak

[<ffffffff8154bf94>] kmalloc_trace+0x24/0x90 mm/slab_common.c:1076
[<ffffffff8347eb55>] kmalloc include/linux/slab.h:582 [inline]
[<ffffffff8347eb55>] kzalloc include/linux/slab.h:703 [inline]
[<ffffffff8347eb55>] dev_new drivers/usb/gadget/legacy/raw_gadget.c:191 [inline]
[<ffffffff8347eb55>] raw_open+0x45/0x110 drivers/usb/gadget/legacy/raw_gadget.c:385
[<ffffffff827d1d09>] misc_open+0x1a9/0x1f0 drivers/char/misc.c:165

[<ffffffff8154bf94>] kmalloc_trace+0x24/0x90 mm/slab_common.c:1076
[<ffffffff8347cd2f>] kmalloc include/linux/slab.h:582 [inline]
[<ffffffff8347cd2f>] raw_ioctl_init+0xdf/0x410 drivers/usb/gadget/legacy/raw_gadget.c:460
[<ffffffff8347dfe9>] raw_ioctl+0x5f9/0x1120 drivers/usb/gadget/legacy/raw_gadget.c:1250
[<ffffffff81685173>] vfs_ioctl fs/ioctl.c:51 [inline]

[<ffffffff8154bf94>] kmalloc_trace+0x24/0x90 mm/slab_common.c:1076
[<ffffffff833ecc6a>] kmalloc include/linux/slab.h:582 [inline]
[<ffffffff833ecc6a>] kzalloc include/linux/slab.h:703 [inline]
[<ffffffff833ecc6a>] dummy_alloc_request+0x5a/0xe0 drivers/usb/gadget/udc/dummy_hcd.c:665
[<ffffffff833e9132>] usb_ep_alloc_request+0x22/0xd0 drivers/usb/gadget/udc/core.c:196
[<ffffffff8347f13d>] gadget_bind+0x6d/0x370 drivers/usb/gadget/legacy/raw_gadget.c:292

This commit therefore invoke kref_get() under the condition that
raw_queue_event() return success.

The Linux kernel CVE team has assigned CVE-2023-53693 to this issue.


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

	Fixed in 5.10.190 with commit 68e6287ac61dc22513cd39f02b9ac1fef28513e4
	Fixed in 5.15.124 with commit 0f7a2b567197798da7bfa2252f4485c0ca6c6266
	Fixed in 6.1.43 with commit de77000c1923d7942f9b4f08447c8feeae1c0f33
	Fixed in 6.4.8 with commit 9934e5d07c0dc294169a7d52f6309f35cd6d7755
	Fixed in 6.5 with commit 83e30f2bf86ef7c38fbd476ed81a88522b620628

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-2023-53693
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/gadget/legacy/raw_gadget.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/68e6287ac61dc22513cd39f02b9ac1fef28513e4
	https://git.kernel.org/stable/c/0f7a2b567197798da7bfa2252f4485c0ca6c6266
	https://git.kernel.org/stable/c/de77000c1923d7942f9b4f08447c8feeae1c0f33
	https://git.kernel.org/stable/c/9934e5d07c0dc294169a7d52f6309f35cd6d7755
	https://git.kernel.org/stable/c/83e30f2bf86ef7c38fbd476ed81a88522b620628