Answer in brief
CVE-2025-21776 records a Unknown severity vulnerability in USB: hub: Ignore non-compliant devices with too many configs or interfaces. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - BIOS (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - BIOS (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=d2123fd9e1a56b8006986ed37e0aaf93ef0dd978 <49f077106fa07919a6a6dda99bb490dd1d1a8218 || >=d2123fd9e1a56b8006986ed37e0aaf93ef0dd978 <d343fe0fad5c1d689775f2dda24a85ce98e29566 || >=d2123fd9e1a56b8006986ed37e0aaf93ef0dd978 <d3a67adb365cdfdac4620daf38a82e57ca45806c || >=d2123fd9e1a56b8006986ed37e0aaf93ef0dd978 <c3720b04df84b5459050ae4e03ec7d545652f897 || >=d2123fd9e1a56b8006986ed37e0aaf93ef0dd978 <e905a0fca7bff0855d312c16f71e60e1773b393e || >=d2123fd9e1a56b8006986ed37e0aaf93ef0dd978 <62d8f4c5454dd39aded4f343720d1c5a1803cfef || >=d2123fd9e1a56b8006986ed37e0aaf93ef0dd978 <5b9778e1fe715700993ce436c152dc3b7df0b490 || >=d2123fd9e1a56b8006986ed37e0aaf93ef0dd978 <2240fed37afbcdb5e8b627bc7ad986891100e05d | 49f077106fa07919a6a6dda99bb490dd1d1a8218, d343fe0fad5c1d689775f2dda24a85ce98e29566, d3a67adb365cdfdac4620daf38a82e57ca45806c, c3720b04df84b5459050ae4e03ec7d545652f897, e905a0fca7bff0855d312c16f71e60e1773b393e, 62d8f4c5454dd39aded4f343720d1c5a1803cfef, 5b9778e1fe715700993ce436c152dc3b7df0b490, 2240fed37afbcdb5e8b627bc7ad986891100e05d |
| Linux/Linuxgeneric | 3.9 | Not reported |
| Siemens/SIMATIC S7-1500 TM MFP - BIOSgeneric | >=0 <* | * |
| Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystemgeneric | >=0 <* | * |
Published upstream
Feb 27, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 15, 2026
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.
Quoted source text, attributed separately from HOL analysis.