| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.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 5.4.291 with commit 49f077106fa07919a6a6dda99bb490dd1d1a8218 |
| Fixed in 5.10.235 with commit d343fe0fad5c1d689775f2dda24a85ce98e29566 |
| Fixed in 5.15.179 with commit d3a67adb365cdfdac4620daf38a82e57ca45806c |
| 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 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/49f077106fa07919a6a6dda99bb490dd1d1a8218 |
| https://git.kernel.org/stable/c/d343fe0fad5c1d689775f2dda24a85ce98e29566 |
| https://git.kernel.org/stable/c/d3a67adb365cdfdac4620daf38a82e57ca45806c |
| 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 |
