UBSAN: shift-out-of-bounds in vcc

ID	Workflow	Result	Correct	Bug	Created	Started	Finished	Revision
0979e4ae	assessment-security	DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ✅ RemoteTrigger: ❌ Unprivileged: ✅ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌	❓	UBSAN: shift-out-of-bounds in vcc_connect	2026/08/20 00:00	2026/08/20 00:00	2026/08/20 00:58	1e72964b

Title	Replies (including bot)	Last reply
[PATCH] net: atm: fix shift-out-of-bounds in __vcc_connect()	4 (4)	2026/08/26 12:32
[syzbot] [net?] [usb?] UBSAN: shift-out-of-bounds in vcc_connect	0 (2)	2026/08/24 01:58

Title

Replies (including bot)

Last reply

[PATCH] net: atm: fix shift-out-of-bounds in __vcc_connect()

4 (4)

2026/08/26 12:32

[syzbot] [net?] [usb?] UBSAN: shift-out-of-bounds in vcc_connect

0 (2)

2026/08/24 01:58

Created	Duration	User	Patch	Repo	Result
2026/08/24 01:58	23m	kartikey406@gmail.com	patch	upstream	OK job log log

Created

Duration

User

Patch

Repo

Result

2026/08/24 01:58

23m

kartikey406@gmail.com

patch

upstream

OK job log log

------------[ cut here ]------------ UBSAN: shift-out-of-bounds in net/atm/common.c:381:10 shift exponent -1 is negative CPU: 0 UID: 0 PID: 6073 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 ubsan_epilogue+0xa/0x30 lib/ubsan.c:233 __ubsan_handle_shift_out_of_bounds+0x279/0x2a0 lib/ubsan.c:494 __vcc_connect net/atm/common.c:381 [inline] vcc_connect.cold+0xe0/0x123 net/atm/common.c:498 pvc_bind+0x33f/0x460 net/atm/pvc.c:52 __sys_bind_socket net/socket.c:1945 [inline] __sys_bind_socket net/socket.c:1937 [inline] __sys_bind+0x1a9/0x260 net/socket.c:1976 __do_sys_bind net/socket.c:1981 [inline] __se_sys_bind net/socket.c:1979 [inline] __x64_sys_bind+0x72/0xb0 net/socket.c:1979 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6a3099e0d9 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:00007fff44bcea08 EFLAGS: 00000246 ORIG_RAX: 0000000000000031 RAX: ffffffffffffffda RBX: 00007f6a30c25fa0 RCX: 00007f6a3099e0d9 RDX: 000000000000000c RSI: 0000200000000100 RDI: 0000000000000004 RBP: 00007f6a30a35024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6a30c25fac R14: 00007f6a30c25fa0 R15: 00007f6a30c25fa0 </TASK> ---[ end trace ]---

Crashes (4):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	VM info	Assets (help?)	Manager	Title
2026/08/19 23:36	upstream	bd5f485f3f02	1e72964b	.config	strace log	report	syz / log		[disk image] [vmlinux] [kernel image]	ci-upstream-kasan-gce-selinux-root	UBSAN: shift-out-of-bounds in vcc_connect
2026/08/19 21:06	upstream	bd5f485f3f02	1e72964b	.config	strace log	report	syz / log		[disk image] [vmlinux] [kernel image]	ci-upstream-kasan-gce-selinux-root	UBSAN: shift-out-of-bounds in vcc_connect
2026/08/23 11:43	upstream	2709dd5ae32f	1e72964b	.config	console log	report	syz / log		[disk image (non-bootable)] [vmlinux] [kernel image]	ci-qemu-upstream-386	UBSAN: shift-out-of-bounds in vcc_connect
2026/08/19 18:44	upstream	bd5f485f3f02	1e72964b	.config	console log	report		info	[disk image] [vmlinux] [kernel image]	ci-upstream-kasan-gce-selinux-root	UBSAN: shift-out-of-bounds in vcc_connect

Crashes (4):

Assets (help?)