WARNING in usb_composite_setup

ID	Workflow	Result	Correct	Bug	Created	Started	Finished	Revision
fe116eff	assessment-security	DenialOfService: ✅ Exploitable: ✅ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ✅ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌	❓	WARNING in usb_composite_setup_continue	2026/08/13 10:56	2026/08/13 10:56	2026/08/13 11:33	67796a05

Title	Replies (including bot)	Last reply
[syzbot] WARNING in usb_composite_setup_continue	0 (1)	2026/08/17 11:04

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[syzbot] WARNING in usb_composite_setup_continue

0 (1)

2026/08/17 11:04

------------[ cut here ]------------ usb_composite_setup_continue: Unexpected call WARNING: drivers/usb/gadget/composite.c:2743 at usb_composite_setup_continue+0x2be/0x3a0 drivers/usb/gadget/composite.c:2743, CPU#1: file-storage/5932 Modules linked in: CPU: 1 UID: 0 PID: 5932 Comm: file-storage Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 RIP: 0010:usb_composite_setup_continue+0x2c5/0x3a0 drivers/usb/gadget/composite.c:2743 Code: e5 40 89 ee e8 7c fa 3d fa 40 84 ed 0f 84 35 fe ff ff e9 ec 74 87 f9 e8 59 00 3e fa 48 8d 3d c2 b9 62 09 48 c7 c6 a0 27 b7 8c <67> 48 0f b9 3a e9 d6 fd ff ff e8 3c 00 3e fa 48 89 da 48 b8 00 00 RSP: 0018:ffffc9000204fc88 EFLAGS: 00010093 RAX: 0000000000000000 RBX: ffff888021bce528 RCX: ffffffff87cc7103 RDX: ffff888079b50000 RSI: ffffffff8cb727a0 RDI: ffffffff912f2cf0 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000293 R13: ffff888021bce6c8 R14: ffff88801e31c610 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff888123eec000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4279cc4ff8 CR3: 000000007215b000 CR4: 00000000003526f0 Call Trace: <TASK> handle_exception drivers/usb/gadget/function/f_mass_storage.c:2551 [inline] fsg_main_thread+0x16ec/0x88e0 drivers/usb/gadget/function/f_mass_storage.c:2589 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> ---------------- Code disassembly (best guess): 0: e5 40 in $0x40,%eax 2: 89 ee mov %ebp,%esi 4: e8 7c fa 3d fa call 0xfa3dfa85 9: 40 84 ed test %bpl,%bpl c: 0f 84 35 fe ff ff je 0xfffffe47 12: e9 ec 74 87 f9 jmp 0xf9877503 17: e8 59 00 3e fa call 0xfa3e0075 1c: 48 8d 3d c2 b9 62 09 lea 0x962b9c2(%rip),%rdi # 0x962b9e5 23: 48 c7 c6 a0 27 b7 8c mov $0xffffffff8cb727a0,%rsi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: e9 d6 fd ff ff jmp 0xfffffe0a 34: e8 3c 00 3e fa call 0xfa3e0075 39: 48 89 da mov %rbx,%rdx 3c: 48 rex.W 3d: b8 .byte 0xb8