general protection fault in saitek_event

Status: upstream: reported C repro on 2026/10/15 08:32
Subsystems: input usb
Labels: prio:high
[Documentation on labels]
Reported-by: syzbot+eba2b3201bd25a97cddf@syzkaller.appspotmail.com
First crash: 5d10h, last: 20h46m
Cause bisection: failed (error log, bisect log)
  
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ID Workflow Result Correct Bug Created Started Finished Revision
cc7b997b assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ✅ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ✅ ❓ general protection fault in saitek_event 2026/10/12 00:00 2026/10/12 00:00 2026/10/12 00:43 4f92358f
▶ ▼ Discussions (3)
Title Replies (including bot) Last reply
[PATCH v2] HID: saitek: don't dereference a NULL hidinput in saitek_event() 1 (1) 2026/10/15 15:13
[PATCH] HID: saitek: don't dereference a NULL hidinput in saitek_event() 1 (1) 2026/10/15 14:34
[syzbot] [input?] [usb?] general protection fault in saitek_event 0 (1) 2026/10/15 08:32
▶ ▼ Similar bugs (4)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-6-12 general protection fault in saitek_event origin:upstream 2 syz, C 5 5d09h 5d10h 0/1 premoderation: reported C repro on 2026/10/11 08:25
android-6-1 general protection fault in saitek_event 2 syz, C 6 1d00h 5d09h 0/2 upstream: reported C repro on 2026/10/11 09:03
linux-6.6 general protection fault in saitek_event 2 syz, C 3 5d04h 5d05h 0/2 upstream: reported C repro on 2026/10/11 13:01
linux-6.1 general protection fault in saitek_event 2 syz, C 5 5d04h 5d06h 0/3 upstream: reported C repro on 2026/10/11 12:31

Sample crash report:
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:saitek_event+0x51/0x2b0 drivers/hid/hid-saitek.c:154
Code: aa f8 49 83 c6 78 4c 89 f0 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 f7 e8 4d 5a 1b f9 4d 8b 36 49 83 c6 18 4c 89 f0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 f7 e8 30 5a 1b f9 49 8b 06 48 89 04 24
RSP: 0018:ffffc90000007830 EFLAGS: 00010006
RAX: 0000000000000003 RBX: ffff88801c7ed988 RCX: ffffffff8fa8f000
RDX: 0000000000000100 RSI: 0000000000000100 RDI: ffff8880773c8000
RBP: 000000000000008d R08: 0000000000000000 R09: 0000000000000000
R10: ffff88801c7ed9a8 R11: ffffffff891d95c0 R12: ffffffff910c0c68
R13: dffffc0000000000 R14: 0000000000000018 R15: ffff8880773c8000
FS:  0000000000000000(0000) GS:ffff888123abf000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f50c9650ff8 CR3: 000000007ea2a000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 hid_process_event+0x436/0x620 drivers/hid/hid-core.c:1572
 hid_process_report drivers/hid/hid-core.c:1730 [inline]
 hid_report_raw_event+0xf6a/0x1900 drivers/hid/hid-core.c:2109
 __hid_input_report+0x454/0x580 drivers/hid/hid-core.c:2180
 hid_ctrl+0x204/0x580 drivers/hid/usbhid/hid-core.c:486
 __usb_hcd_giveback_urb+0x378/0x540 drivers/usb/core/hcd.c:1657
 dummy_timer+0xa91/0x4cc0 drivers/usb/gadget/udc/dummy_hcd.c:2023
 __run_hrtimer kernel/time/hrtimer.c:2074 [inline]
 __hrtimer_run_queues+0x3bc/0xa10 kernel/time/hrtimer.c:2131
 hrtimer_run_softirq+0x1e3/0x2e0 kernel/time/hrtimer.c:2148
 handle_softirqs+0x226/0x860 kernel/softirq.c:645
 __do_softirq kernel/softirq.c:679 [inline]
 invoke_softirq kernel/softirq.c:519 [inline]
 __irq_exit_rcu+0xcb/0x220 kernel/softirq.c:758
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:775
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:64
Code: 0b 8b 02 e9 c3 08 03 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d e3 c5 20 00 fb f4 <c3> cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffffff8fa07ca0 EFLAGS: 00000246
RAX: 00000000000a1669 RBX: ffffffff819becb0 RCX: 8000000000000001
RDX: 0000000000000001 RSI: ffffffff8e4696a9 RDI: ffffffff8c6dde80
RBP: ffffffff8fa07d78 R08: ffff8880b8433a1b R09: 1ffff11017086743
R10: dffffc0000000000 R11: ffffed1017086744 R12: 0000000000000000
R13: 1ffffffff1f51e00 R14: 1ffffffff1f40f9c R15: dffffc0000000000
 arch_safe_halt arch/x86/kernel/process.c:767 [inline]
 default_idle+0x9/0x20 arch/x86/kernel/process.c:768
 default_idle_call+0x72/0xb0 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:199 [inline]
 do_idle+0x2e0/0x540 kernel/sched/idle.c:355
 cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:454
 rest_init+0x378/0x3a0 init/main.c:732
 start_kernel+0x392/0x3e0 init/main.c:1190
 x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
 x86_64_start_kernel+0x137/0x1b0 arch/x86/kernel/head64.c:291
 common_startup_64+0x13e/0x157
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:saitek_event+0x51/0x2b0 drivers/hid/hid-saitek.c:154
Code: aa f8 49 83 c6 78 4c 89 f0 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 f7 e8 4d 5a 1b f9 4d 8b 36 49 83 c6 18 4c 89 f0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 f7 e8 30 5a 1b f9 49 8b 06 48 89 04 24
RSP: 0018:ffffc90000007830 EFLAGS: 00010006
RAX: 0000000000000003 RBX: ffff88801c7ed988 RCX: ffffffff8fa8f000
RDX: 0000000000000100 RSI: 0000000000000100 RDI: ffff8880773c8000
RBP: 000000000000008d R08: 0000000000000000 R09: 0000000000000000
R10: ffff88801c7ed9a8 R11: ffffffff891d95c0 R12: ffffffff910c0c68
R13: dffffc0000000000 R14: 0000000000000018 R15: ffff8880773c8000
FS:  0000000000000000(0000) GS:ffff888123abf000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f50c9650ff8 CR3: 000000007ea2a000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	aa                   	stos   %al,%es:(%rdi)
   1:	f8                   	clc
   2:	49 83 c6 78          	add    $0x78,%r14
   6:	4c 89 f0             	mov    %r14,%rax
   9:	48 c1 e8 03          	shr    $0x3,%rax
   d:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1)
  12:	74 08                	je     0x1c
  14:	4c 89 f7             	mov    %r14,%rdi
  17:	e8 4d 5a 1b f9       	call   0xf91b5a69
  1c:	4d 8b 36             	mov    (%r14),%r14
  1f:	49 83 c6 18          	add    $0x18,%r14
  23:	4c 89 f0             	mov    %r14,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	4c 89 f7             	mov    %r14,%rdi
  34:	e8 30 5a 1b f9       	call   0xf91b5a69
  39:	49 8b 06             	mov    (%r14),%rax
  3c:	48 89 04 24          	mov    %rax,(%rsp)

Crashes (20):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/11 13:56 upstream a5ebb76233b7 4f92358f .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce general protection fault in saitek_event
2026/10/11 10:17 upstream a5ebb76233b7 4f92358f .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce general protection fault in saitek_event
2026/10/11 10:02 upstream a5ebb76233b7 4f92358f .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in saitek_event
2026/10/11 09:10 upstream a5ebb76233b7 4f92358f .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in saitek_event
2026/10/11 12:02 linux-next becb95e45ef0 4f92358f .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce general protection fault in saitek_event
2026/10/11 11:11 linux-next becb95e45ef0 4f92358f .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce general protection fault in saitek_event
2026/10/11 10:24 linux-next becb95e45ef0 4f92358f .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce general protection fault in saitek_event
2026/10/15 19:50 upstream 0fcb05b72344 3f2522c6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in saitek_event
2026/10/15 19:49 upstream 0fcb05b72344 3f2522c6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root general protection fault in saitek_event
2026/10/15 18:28 upstream 0fcb05b72344 3f2522c6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce general protection fault in saitek_event
2026/10/11 08:27 upstream a5ebb76233b7 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce general protection fault in saitek_event
2026/10/11 08:27 upstream a5ebb76233b7 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce general protection fault in saitek_event
2026/10/15 22:00 upstream 045958acaa75 3f2522c6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 general protection fault in saitek_event
2026/10/15 22:00 upstream 045958acaa75 3f2522c6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 general protection fault in saitek_event
2026/10/15 19:00 upstream 045958acaa75 3f2522c6 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in saitek_event
2026/10/15 19:00 upstream 045958acaa75 3f2522c6 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in saitek_event
2026/10/11 08:29 upstream a5ebb76233b7 4f92358f .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in saitek_event
2026/10/11 08:29 upstream a5ebb76233b7 4f92358f .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root general protection fault in saitek_event
2026/10/15 20:55 linux-next b810335a0699 3f2522c6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce general protection fault in saitek_event
2026/10/11 08:47 linux-next becb95e45ef0 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce general protection fault in saitek_event
* Struck through repros no longer work on HEAD.