kernel tried to execute NX-protected page - exploit attempt? (uid: 0) BUG: unable to handle page fault for address: ffffffff85bf6da8 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0011) - permissions violation PGD 6412067 P4D 6412067 PUD 6413063 PMD 8000000005a001e1 Oops: 0011 [#1] PREEMPT SMP KASAN CPU: 1 PID: 4106 Comm: syz.4.958 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:rx_queue_ktype+0x0/0x58 Code: 00 00 00 60 5e 05 81 88 ff ff 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <80> 49 ab 83 ff ff ff ff e0 c4 6f 85 ff ff ff ff 00 00 00 00 00 00 RSP: 0018:ffffc900017d77d0 EFLAGS: 00010282 RAX: ffffffff85bf6da8 RBX: ffff8881087c8700 RCX: dffffc0000000000 RDX: ffffc9000c0fe000 RSI: 00000000000002b9 RDI: ffff88813071a000 RBP: ffffc900017d7830 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff520002faeec R12: ffff8881136b6d38 R13: ffff8881087c8718 R14: ffffffff8681cde0 R15: ffff88813071a000 FS: 00007f9e9babb6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffff85bf6da8 CR3: 0000000123c49000 CR4: 00000000003526a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kobject_add_varg lib/kobject.c:398 [inline] kobject_add+0x165/0x230 lib/kobject.c:450 class_dir_create_and_add drivers/base/core.c:2825 [inline] get_device_parent+0x3a6/0x410 drivers/base/core.c:2880 device_add+0x349/0xc00 drivers/base/core.c:3192 device_create_groups_vargs drivers/base/core.c:3960 [inline] device_create+0x26c/0x300 drivers/base/core.c:4002 create_function_device+0x60/0x70 drivers/usb/gadget/configfs.c:31 create_alsa_device drivers/usb/gadget/function/f_midi.c:1262 [inline] f_midi_alloc_inst+0x1a8/0x380 drivers/usb/gadget/function/f_midi.c:1303 try_get_usb_function_instance drivers/usb/gadget/functions.c:28 [inline] usb_get_function_instance+0xe2/0x2f0 drivers/usb/gadget/functions.c:44 function_make+0x118/0x350 drivers/usb/gadget/configfs.c:636 configfs_mkdir+0x5d2/0xd90 fs/configfs/dir.c:1382 vfs_mkdir+0x42c/0x600 fs/namei.c:3798 do_mkdirat+0x14c/0x340 fs/namei.c:3820 __do_sys_mkdirat fs/namei.c:3831 [inline] __se_sys_mkdirat fs/namei.c:3829 [inline] __x64_sys_mkdirat+0x7b/0x90 fs/namei.c:3829 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f9e9d0a40d9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f9e9babb028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f9e9d32c180 RCX: 00007f9e9d0a40d9 RDX: 00000000000001ff RSI: 00002000000003c0 RDI: ffffffffffffff9c RBP: 00007f9e9d13b024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9e9d32c218 R14: 00007f9e9d32c180 R15: 00007ffd710982c8 Modules linked in: CR2: ffffffff85bf6da8 ---[ end trace b1fa364c24b5c69b ]--- RIP: 0010:rx_queue_ktype+0x0/0x58 Code: 00 00 00 60 5e 05 81 88 ff ff 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <80> 49 ab 83 ff ff ff ff e0 c4 6f 85 ff ff ff ff 00 00 00 00 00 00 RSP: 0018:ffffc900017d77d0 EFLAGS: 00010282 RAX: ffffffff85bf6da8 RBX: ffff8881087c8700 RCX: dffffc0000000000 RDX: ffffc9000c0fe000 RSI: 00000000000002b9 RDI: ffff88813071a000 RBP: ffffc900017d7830 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff520002faeec R12: ffff8881136b6d38 R13: ffff8881087c8718 R14: ffffffff8681cde0 R15: ffff88813071a000 FS: 00007f9e9babb6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffff85bf6da8 CR3: 0000000123c49000 CR4: 00000000003526a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 00 60 5e add %ah,0x5e(%rax) 5: 05 81 88 ff ff add $0xffff8881,%eax * 2a: 80 49 ab 83 orb $0x83,-0x55(%rcx) <-- trapping instruction 2e: ff (bad) 2f: ff (bad) 30: ff (bad) 31: ff e0 jmp *%rax 33: c4 (bad) 34: 6f outsl %ds:(%rsi),(%dx) 35: 85 ff test %edi,%edi 37: ff (bad) 38: ff (bad) 39: ff 00 incl (%rax) 3b: 00 00 add %al,(%rax) 3d: 00 00 add %al,(%rax)