usb 1-1: New USB device found, idVendor=10c4, idProduct=8acf, bcdDevice= 0.00 usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 usb 1-1: config 0 descriptor?? hid-u2fzero 0003:10C4:8ACF.0001: hidraw0: USB HID v0.00 Device [HID 10c4:8acf] on usb-dummy_hcd.0-1/input0 hid-u2fzero 0003:10C4:8ACF.0001: U2F Zero 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: 21 Comm: kworker/1:0 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Workqueue: usb_hub_wq hub_event RIP: 0010:u2fzero_recv drivers/hid/hid-u2fzero.c:116 [inline] RIP: 0010:u2fzero_rng_read+0x23e/0x710 drivers/hid/hid-u2fzero.c:202 Code: 24 74 0d 48 8b 3c 24 e8 a0 d9 50 fa 48 8b 04 24 41 bf a8 00 00 00 4c 03 38 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ff e8 f4 d9 50 fa 48 8d 44 24 60 49 89 07 RSP: 0018:ffffc90000db69a0 EFLAGS: 00010202 RAX: 0000000000000015 RBX: 1ffff11004085471 RCX: dffffc0000000000 RDX: 000000000000003b RSI: 0000000000000000 RDI: ffff888075168869 RBP: ffffc90000db6b30 R08: 0000000000000000 R09: ffff88807516882e R10: dffffc0000000000 R11: ffffed100ea2d10d R12: 1ffff11004085405 R13: 1ffff920001b6d3c R14: 1ffff11004085406 R15: 00000000000000a8 FS: 0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa8124d90f5 CR3: 000000002395a000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rng_get_data drivers/char/hw_random/core.c:196 [inline] add_early_randomness+0x7a/0x150 drivers/char/hw_random/core.c:74 hwrng_register+0x406/0x490 drivers/char/hw_random/core.c:526 devm_hwrng_register+0x43/0xb0 drivers/char/hw_random/core.c:597 u2fzero_probe+0x26e/0x2f0 drivers/hid/hid-u2fzero.c:336 hid_device_probe+0x275/0x360 drivers/hid/hid-core.c:2341 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x276/0xc70 drivers/base/dd.c:595 __driver_probe_device+0x1f5/0x390 drivers/base/dd.c:775 driver_probe_device+0x4f/0x420 drivers/base/dd.c:805 __device_attach_driver+0x2b0/0x500 drivers/base/dd.c:927 bus_for_each_drv+0x184/0x210 drivers/base/bus.c:429 __device_attach+0x2a7/0x480 drivers/base/dd.c:999 bus_probe_device+0xba/0x1d0 drivers/base/bus.c:489 device_add+0xbcf/0x1050 drivers/base/core.c:3427 hid_add_device+0x361/0x500 drivers/hid/hid-core.c:2493 usbhid_probe+0xbc5/0xf50 drivers/hid/usbhid/hid-core.c:1442 usb_probe_interface+0x5be/0xae0 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x276/0xc70 drivers/base/dd.c:595 __driver_probe_device+0x1f5/0x390 drivers/base/dd.c:775 driver_probe_device+0x4f/0x420 drivers/base/dd.c:805 __device_attach_driver+0x2b0/0x500 drivers/base/dd.c:927 bus_for_each_drv+0x184/0x210 drivers/base/bus.c:429 __device_attach+0x2a7/0x480 drivers/base/dd.c:999 bus_probe_device+0xba/0x1d0 drivers/base/bus.c:489 device_add+0xbcf/0x1050 drivers/base/core.c:3427 usb_set_configuration+0x19d5/0x2030 drivers/usb/core/message.c:2223 usb_generic_driver_probe+0x89/0x150 drivers/usb/core/generic.c:238 usb_probe_device+0x126/0x250 drivers/usb/core/driver.c:293 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x276/0xc70 drivers/base/dd.c:595 __driver_probe_device+0x1f5/0x390 drivers/base/dd.c:775 driver_probe_device+0x4f/0x420 drivers/base/dd.c:805 __device_attach_driver+0x2b0/0x500 drivers/base/dd.c:927 bus_for_each_drv+0x184/0x210 drivers/base/bus.c:429 __device_attach+0x2a7/0x480 drivers/base/dd.c:999 bus_probe_device+0xba/0x1d0 drivers/base/bus.c:489 device_add+0xbcf/0x1050 drivers/base/core.c:3427 usb_new_device+0x9f6/0x15d0 drivers/usb/core/hub.c:2632 hub_port_connect drivers/usb/core/hub.c:5497 [inline] hub_port_connect_change drivers/usb/core/hub.c:5637 [inline] port_event drivers/usb/core/hub.c:5799 [inline] hub_event+0x2b8d/0x5260 drivers/usb/core/hub.c:5881 process_one_work+0x867/0xff0 kernel/workqueue.c:2310 worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457 kthread+0x42e/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Modules linked in: ---[ end trace b5d247dd57d7084e ]--- RIP: 0010:u2fzero_recv drivers/hid/hid-u2fzero.c:116 [inline] RIP: 0010:u2fzero_rng_read+0x23e/0x710 drivers/hid/hid-u2fzero.c:202 Code: 24 74 0d 48 8b 3c 24 e8 a0 d9 50 fa 48 8b 04 24 41 bf a8 00 00 00 4c 03 38 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ff e8 f4 d9 50 fa 48 8d 44 24 60 49 89 07 RSP: 0018:ffffc90000db69a0 EFLAGS: 00010202 RAX: 0000000000000015 RBX: 1ffff11004085471 RCX: dffffc0000000000 RDX: 000000000000003b RSI: 0000000000000000 RDI: ffff888075168869 RBP: ffffc90000db6b30 R08: 0000000000000000 R09: ffff88807516882e R10: dffffc0000000000 R11: ffffed100ea2d10d R12: 1ffff11004085405 R13: 1ffff920001b6d3c R14: 1ffff11004085406 R15: 00000000000000a8 FS: 0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa8124d90f5 CR3: 000000002395a000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 24 74 and $0x74,%al 2: 0d 48 8b 3c 24 or $0x243c8b48,%eax 7: e8 a0 d9 50 fa call 0xfa50d9ac c: 48 8b 04 24 mov (%rsp),%rax 10: 41 bf a8 00 00 00 mov $0xa8,%r15d 16: 4c 03 38 add (%rax),%r15 19: 4c 89 f8 mov %r15,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 27: fc ff df * 2a: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 ff mov %r15,%rdi 33: e8 f4 d9 50 fa call 0xfa50da2c 38: 48 8d 44 24 60 lea 0x60(%rsp),%rax 3d: 49 89 07 mov %rax,(%r15)