usb 4-1: config 0 descriptor?? hid-u2fzero 0003:20A0:4287.0004: hidraw0: USB HID v0.8b Joystick [HID 20a0:4287] on usb-dummy_hcd.3-1/input0 hid-u2fzero 0003:20A0:4287.0004: NitroKey U2F LED initialised general protection fault, probably for non-canonical address 0xdffffc0000000015: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000000a8-0x00000000000000af] CPU: 1 PID: 9782 Comm: kworker/1:4 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Workqueue: usb_hub_wq hub_event RIP: 0010:u2fzero_recv drivers/hid/hid-u2fzero.c:137 [inline] RIP: 0010:u2fzero_rng_read+0x262/0x670 drivers/hid/hid-u2fzero.c:223 Code: 48 c1 e8 03 48 89 44 24 20 80 3c 18 00 74 08 4c 89 e7 e8 f1 e6 dc f9 4c 89 e0 41 bc a8 00 00 00 4c 03 20 4c 89 e0 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 e7 e8 70 e7 dc f9 48 8d 44 24 60 49 89 04 RSP: 0018:ffffc9000464e860 EFLAGS: 00010202 RAX: 0000000000000015 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffc9000464e980 RDI: ffff88802e5f7c68 RBP: ffffc9000464ea80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 00000000000000a8 R13: 1ffff920008c9d14 R14: 1ffff110041ec805 R15: ffff888020f64300 FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000556e1bcba638 CR3: 00000000255bb000 CR4: 00000000003506e0 Call Trace: rng_get_data drivers/char/hw_random/core.c:198 [inline] add_early_randomness+0x7a/0x1a0 drivers/char/hw_random/core.c:72 hwrng_register+0x3db/0x4a0 drivers/char/hw_random/core.c:593 devm_hwrng_register+0x47/0xb0 drivers/char/hw_random/core.c:665 u2fzero_probe+0x351/0x460 drivers/hid/hid-u2fzero.c:358 __hid_device_probe drivers/hid/hid-core.c:2681 [inline] hid_device_probe+0x290/0x5a0 drivers/hid/hid-core.c:2718 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x247/0xae0 drivers/base/dd.c:717 __driver_probe_device+0x1f5/0x390 drivers/base/dd.c:879 driver_probe_device+0x4f/0x420 drivers/base/dd.c:909 __device_attach_driver+0x2ca/0x510 drivers/base/dd.c:1037 bus_for_each_drv+0x252/0x2e0 drivers/base/bus.c:459 __device_attach+0x2c1/0x420 drivers/base/dd.c:1109 bus_probe_device+0x180/0x260 drivers/base/bus.c:580 device_add+0x87c/0xc40 drivers/base/core.c:3700 hid_add_device+0x365/0x500 drivers/hid/hid-core.c:2864 usbhid_probe+0xe43/0x1260 drivers/hid/usbhid/hid-core.c:1447 usb_probe_interface+0x5c2/0xaf0 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x247/0xae0 drivers/base/dd.c:717 __driver_probe_device+0x1f5/0x390 drivers/base/dd.c:879 driver_probe_device+0x4f/0x420 drivers/base/dd.c:909 __device_attach_driver+0x2ca/0x510 drivers/base/dd.c:1037 bus_for_each_drv+0x252/0x2e0 drivers/base/bus.c:459 __device_attach+0x2c1/0x420 drivers/base/dd.c:1109 bus_probe_device+0x180/0x260 drivers/base/bus.c:580 device_add+0x87c/0xc40 drivers/base/core.c:3700 usb_set_configuration+0x1ad0/0x2150 drivers/usb/core/message.c:2265 usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:238 usb_probe_device+0x12a/0x260 drivers/usb/core/driver.c:293 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x247/0xae0 drivers/base/dd.c:717 __driver_probe_device+0x1f5/0x390 drivers/base/dd.c:879 driver_probe_device+0x4f/0x420 drivers/base/dd.c:909 __device_attach_driver+0x2ca/0x510 drivers/base/dd.c:1037 bus_for_each_drv+0x252/0x2e0 drivers/base/bus.c:459 __device_attach+0x2c1/0x420 drivers/base/dd.c:1109 bus_probe_device+0x180/0x260 drivers/base/bus.c:580 device_add+0x87c/0xc40 drivers/base/core.c:3700 usb_new_device+0x995/0x1550 drivers/usb/core/hub.c:2665 hub_port_connect drivers/usb/core/hub.c:5534 [inline] hub_port_connect_change drivers/usb/core/hub.c:5674 [inline] port_event drivers/usb/core/hub.c:5838 [inline] hub_event+0x29d5/0x4a80 drivers/usb/core/hub.c:5920 process_one_work kernel/workqueue.c:2657 [inline] process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2734 worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2815 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:u2fzero_recv drivers/hid/hid-u2fzero.c:137 [inline] RIP: 0010:u2fzero_rng_read+0x262/0x670 drivers/hid/hid-u2fzero.c:223 Code: 48 c1 e8 03 48 89 44 24 20 80 3c 18 00 74 08 4c 89 e7 e8 f1 e6 dc f9 4c 89 e0 41 bc a8 00 00 00 4c 03 20 4c 89 e0 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 e7 e8 70 e7 dc f9 48 8d 44 24 60 49 89 04 RSP: 0018:ffffc9000464e860 EFLAGS: 00010202 RAX: 0000000000000015 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffc9000464e980 RDI: ffff88802e5f7c68 RBP: ffffc9000464ea80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 00000000000000a8 R13: 1ffff920008c9d14 R14: 1ffff110041ec805 R15: ffff888020f64300 FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f67df3ef2f8 CR3: 000000005cb6a000 CR4: 00000000003506e0 ---------------- Code disassembly (best guess): 0: 48 c1 e8 03 shr $0x3,%rax 4: 48 89 44 24 20 mov %rax,0x20(%rsp) 9: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) d: 74 08 je 0x17 f: 4c 89 e7 mov %r12,%rdi 12: e8 f1 e6 dc f9 call 0xf9dce708 17: 4c 89 e0 mov %r12,%rax 1a: 41 bc a8 00 00 00 mov $0xa8,%r12d 20: 4c 03 20 add (%rax),%r12 23: 4c 89 e0 mov %r12,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 e7 mov %r12,%rdi 33: e8 70 e7 dc f9 call 0xf9dce7a8 38: 48 8d 44 24 60 lea 0x60(%rsp),%rax 3d: 49 rex.WB 3e: 89 .byte 0x89 3f: 04 .byte 0x4