general protection fault in emi26_probe

Status: upstream: reported C repro on 2026/08/02 00:00
Subsystems: usb
Labels: prio:low
[Documentation on labels]
Reported-by: syzbot+baf3cbba7dd980984f0d@syzkaller.appspotmail.com
First crash: 52d, last: 23d
Cause bisection: failed (error log, bisect log)
  
▶ ▼ ✨ AI Patch Versions (1)
Version Stage Reported Report Link Job
1 moderation 2026/08/03 09:07 Discussion a0c10e66-d30e-44f1-8ad1-c7f25ff69b04
▶ ▼ ✨ AI Jobs (2)
ID Workflow Result Correct Bug Created Started Finished Revision
a0c10e66 patching ❓ general protection fault in emi26_probe 2026/08/03 07:44 2026/08/03 07:44 2026/08/03 09:07 e611ffe1
3891670c assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ general protection fault in emi26_probe 2026/07/30 00:00 2026/07/30 00:00 2026/07/30 00:51 2377cd3d
▶ ▼ Discussions (2)
Title Replies (including bot) Last reply
Re: [PATCH] ihex: Fix 16 bit truncation in ihex_binrec_size() 1 (1) 2026/09/02 12:45
[syzbot] [usb?] general protection fault in emi26_probe 0 (2) 2026/08/03 03:11
▶ ▼ Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 general protection fault in emi26_probe origin:upstream 2 syz, C 15 15d 51d 0/3 upstream: reported C repro on 2026/07/28 11:32
linux-6.6 general protection fault in emi26_probe 2 syz 2 11d 51d 0/2 upstream: reported syz repro on 2026/07/28 23:05
linux-5.15 general protection fault in emi26_probe origin:upstream 2 syz, C 10 25d 46d 0/3 upstream: reported C repro on 2026/08/02 13:37

Sample crash report:
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 UID: 0 PID: 24 Comm: kworker/1:0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
Workqueue: usb_hub_wq hub_event
RIP: 0010:ihex_binrec_size include/linux/ihex.h:26 [inline]
RIP: 0010:__ihex_next_binrec include/linux/ihex.h:35 [inline]
RIP: 0010:ihex_validate_fw include/linux/ihex.h:54 [inline]
RIP: 0010:request_ihex_firmware include/linux/ihex.h:74 [inline]
RIP: 0010:emi26_load_firmware drivers/usb/misc/emi26.c:86 [inline]
RIP: 0010:emi26_probe+0x283/0x1690 drivers/usb/misc/emi26.c:232
Code: ff 89 de e8 bf 9d 98 00 85 db 0f 84 d9 01 00 00 e8 12 9a 98 00 48 bb 00 00 00 00 00 fc ff df 49 8d 7e 04 48 89 f8 48 c1 e8 03 <0f> b6 04 18 84 c0 75 47 49 8d 7e 05 48 89 f8 48 c1 e8 03 0f b6 04
RSP: 0018:ffffc900001e6d60 EFLAGS: 00010257
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff88801e685d00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: ffffc900001e6e90 R08: ffffffff90579d37 R09: 1ffffffff20af3a6
R10: dffffc0000000000 R11: fffffbfff20af3a7 R12: fffffffffffffffa
R13: 1fffffffffffffff R14: 0000000000000000 R15: 1fffffffffffffff
FS:  0000000000000000(0000) GS:ffff88812504b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb3098d0a60 CR3: 0000000028671000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 usb_probe_interface+0x653/0xc60 drivers/usb/core/driver.c:396
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x254/0xae0 drivers/base/dd.c:706
 __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868
 driver_probe_device+0x4f/0x240 drivers/base/dd.c:898
 __device_attach_driver+0x270/0x410 drivers/base/dd.c:1026
 bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:500
 __device_attach+0x2c4/0x450 drivers/base/dd.c:1098
 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1153
 bus_probe_device+0x12a/0x220 drivers/base/bus.c:620
 device_add+0x7d7/0xb80 drivers/base/core.c:3772
 usb_set_configuration+0x1ad8/0x2180 drivers/usb/core/message.c:2268
 usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250
 usb_probe_device+0x1c3/0x3b0 drivers/usb/core/driver.c:291
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x254/0xae0 drivers/base/dd.c:706
 __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868
 driver_probe_device+0x4f/0x240 drivers/base/dd.c:898
 __device_attach_driver+0x270/0x410 drivers/base/dd.c:1026
 bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:500
 __device_attach+0x2c4/0x450 drivers/base/dd.c:1098
 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1153
 bus_probe_device+0x12a/0x220 drivers/base/bus.c:620
 device_add+0x7d7/0xb80 drivers/base/core.c:3772
 usb_new_device+0x99d/0x1620 drivers/usb/core/hub.c:2695
 hub_port_connect drivers/usb/core/hub.c:5567 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
 port_event drivers/usb/core/hub.c:5871 [inline]
 hub_event+0x28e8/0x4d30 drivers/usb/core/hub.c:5953
 process_one_work kernel/workqueue.c:3322 [inline]
 process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ihex_binrec_size include/linux/ihex.h:26 [inline]
RIP: 0010:__ihex_next_binrec include/linux/ihex.h:35 [inline]
RIP: 0010:ihex_validate_fw include/linux/ihex.h:54 [inline]
RIP: 0010:request_ihex_firmware include/linux/ihex.h:74 [inline]
RIP: 0010:emi26_load_firmware drivers/usb/misc/emi26.c:86 [inline]
RIP: 0010:emi26_probe+0x283/0x1690 drivers/usb/misc/emi26.c:232
Code: ff 89 de e8 bf 9d 98 00 85 db 0f 84 d9 01 00 00 e8 12 9a 98 00 48 bb 00 00 00 00 00 fc ff df 49 8d 7e 04 48 89 f8 48 c1 e8 03 <0f> b6 04 18 84 c0 75 47 49 8d 7e 05 48 89 f8 48 c1 e8 03 0f b6 04
RSP: 0018:ffffc900001e6d60 EFLAGS: 00010257
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff88801e685d00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: ffffc900001e6e90 R08: ffffffff90579d37 R09: 1ffffffff20af3a6
R10: dffffc0000000000 R11: fffffbfff20af3a7 R12: fffffffffffffffa
R13: 1fffffffffffffff R14: 0000000000000000 R15: 1fffffffffffffff
FS:  0000000000000000(0000) GS:ffff88812504b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055f773fefbf0 CR3: 00000000351a6000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
   0:	ff 89 de e8 bf 9d    	decl   -0x62401722(%rcx)
   6:	98                   	cwtl
   7:	00 85 db 0f 84 d9    	add    %al,-0x267bf025(%rbp)
   d:	01 00                	add    %eax,(%rax)
   f:	00 e8                	add    %ch,%al
  11:	12 9a 98 00 48 bb    	adc    -0x44b7ff68(%rdx),%bl
  17:	00 00                	add    %al,(%rax)
  19:	00 00                	add    %al,(%rax)
  1b:	00 fc                	add    %bh,%ah
  1d:	ff                   	lcall  (bad)
  1e:	df 49 8d             	fisttps -0x73(%rcx)
  21:	7e 04                	jle    0x27
  23:	48 89 f8             	mov    %rdi,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	0f b6 04 18          	movzbl (%rax,%rbx,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	75 47                	jne    0x79
  32:	49 8d 7e 05          	lea    0x5(%r14),%rdi
  36:	48 89 f8             	mov    %rdi,%rax
  39:	48 c1 e8 03          	shr    $0x3,%rax
  3d:	0f                   	.byte 0xf
  3e:	b6 04                	mov    $0x4,%dh

Crashes (17):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/03 03:10 upstream bd1dde877520 e611ffe1 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in emi26_probe
2026/08/25 05:54 linux-next 4b18edbd8e70 23caa175 .config strace log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce general protection fault in emi26_probe
2026/08/24 21:06 linux-next 4b18edbd8e70 23caa175 .config strace log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce general protection fault in emi26_probe
2026/08/02 23:35 upstream bd1dde877520 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in emi26_probe
2026/07/29 18:43 upstream fc02acf6ac0c cb1587ea .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in emi26_probe
2026/07/29 18:43 upstream fc02acf6ac0c cb1587ea .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in emi26_probe
2026/07/28 01:47 upstream f5098b6bae76 4cb2b096 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root general protection fault in emi26_probe
2026/07/28 01:47 upstream f5098b6bae76 4cb2b096 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root general protection fault in emi26_probe
2026/07/29 10:38 linux-next cc2b5f627e8c 19622d9d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce general protection fault in emi26_probe
2026/07/29 08:43 linux-next cc2b5f627e8c 19622d9d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce general protection fault in emi26_probe
2026/07/29 08:40 linux-next cc2b5f627e8c 19622d9d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce general protection fault in emi26_probe
2026/07/29 08:35 linux-next cc2b5f627e8c 19622d9d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce general protection fault in emi26_probe
2026/07/29 08:30 linux-next cc2b5f627e8c 19622d9d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce general protection fault in emi26_probe
2026/07/29 08:26 linux-next cc2b5f627e8c 19622d9d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce general protection fault in emi26_probe
2026/07/28 14:28 linux-next cc2b5f627e8c 45ae1df4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce general protection fault in emi26_probe
2026/07/28 14:26 linux-next cc2b5f627e8c 45ae1df4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce general protection fault in emi26_probe
2026/08/17 07:30 upstream dcb68831eac7 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root KASAN: vmalloc-out-of-bounds Read in emi26_probe
* Struck through repros no longer work on HEAD.