linux-cve-announce - CVE-2025-21776: USB: hub: Ignore non-compliant devices with too many configs or interfaces

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Message-ID: <2025022607-CVE-2025-21776-5581@gregkh>
Date: Wed, 26 Feb 2025 18:17:32 -0800
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-21776: USB: hub: Ignore non-compliant devices with too many configs or interfaces

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

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

USB: hub: Ignore non-compliant devices with too many configs or interfaces

Robert Morris created a test program which can cause
usb_hub_to_struct_hub() to dereference a NULL or inappropriate
pointer:

Oops: general protection fault, probably for non-canonical address
0xcccccccccccccccc: 0000 [#1] SMP DEBUG_PAGEALLOC PTI
CPU: 7 UID: 0 PID: 117 Comm: kworker/7:1 Not tainted 6.13.0-rc3-00017-gf44d154d6e3d #14
Hardware name: FreeBSD BHYVE/BHYVE, BIOS 14.0 10/17/2021
Workqueue: usb_hub_wq hub_event
RIP: 0010:usb_hub_adjust_deviceremovable+0x78/0x110
...
Call Trace:
 <TASK>
 ? die_addr+0x31/0x80
 ? exc_general_protection+0x1b4/0x3c0
 ? asm_exc_general_protection+0x26/0x30
 ? usb_hub_adjust_deviceremovable+0x78/0x110
 hub_probe+0x7c7/0xab0
 usb_probe_interface+0x14b/0x350
 really_probe+0xd0/0x2d0
 ? __pfx___device_attach_driver+0x10/0x10
 __driver_probe_device+0x6e/0x110
 driver_probe_device+0x1a/0x90
 __device_attach_driver+0x7e/0xc0
 bus_for_each_drv+0x7f/0xd0
 __device_attach+0xaa/0x1a0
 bus_probe_device+0x8b/0xa0
 device_add+0x62e/0x810
 usb_set_configuration+0x65d/0x990
 usb_generic_driver_probe+0x4b/0x70
 usb_probe_device+0x36/0xd0

The cause of this error is that the device has two interfaces, and the
hub driver binds to interface 1 instead of interface 0, which is where
usb_hub_to_struct_hub() looks.

We can prevent the problem from occurring by refusing to accept hub
devices that violate the USB spec by having more than one
configuration or interface.

The Linux kernel CVE team has assigned CVE-2025-21776 to this issue.

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

	Fixed in 6.1.129 with commit c3720b04df84b5459050ae4e03ec7d545652f897
	Fixed in 6.6.79 with commit e905a0fca7bff0855d312c16f71e60e1773b393e
	Fixed in 6.12.16 with commit 62d8f4c5454dd39aded4f343720d1c5a1803cfef
	Fixed in 6.13.4 with commit 5b9778e1fe715700993ce436c152dc3b7df0b490
	Fixed in 6.14-rc3 with commit 2240fed37afbcdb5e8b627bc7ad986891100e05d

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-2025-21776
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/core/hub.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/c3720b04df84b5459050ae4e03ec7d545652f897
	https://git.kernel.org/stable/c/e905a0fca7bff0855d312c16f71e60e1773b393e
	https://git.kernel.org/stable/c/62d8f4c5454dd39aded4f343720d1c5a1803cfef
	https://git.kernel.org/stable/c/5b9778e1fe715700993ce436c152dc3b7df0b490
	https://git.kernel.org/stable/c/2240fed37afbcdb5e8b627bc7ad986891100e05d