KASAN: global-out-of-bounds Read in usb_copy_descriptors

Status: upstream: reported on 2026/07/28 13:41
Subsystems: usb
Labels: prio:high
[Documentation on labels]
Reported-by: syzbot+debc5c305403f180c01c@syzkaller.appspotmail.com
First crash: 54d, last: 8d01h
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ID Workflow Result Correct Bug Created Started Finished Revision
1662516b assessment-security DenialOfService: ✅ Exploitable: ✅ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ✅ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ KASAN: global-out-of-bounds Read in usb_copy_descriptors 2026/07/26 02:15 2026/07/26 02:15 2026/07/26 03:35 492bab15
▶ ▼ Discussions (2)
Title Replies (including bot) Last reply
[PATCH] usb: gadget: f_uac1: fix ac_header_desc in SS descriptor list 1 (1) 2026/08/01 21:08
[syzbot] [usb?] KASAN: global-out-of-bounds Read in usb_copy_descriptors 0 (1) 2026/07/28 13:41

Sample crash report:
==================================================================
BUG: KASAN: global-out-of-bounds in usb_copy_descriptors+0x18d/0x320 drivers/usb/gadget/config.c:94
Read of size 224 at addr ffffffff9bcb3be0 by task syz.9.2833/17962

CPU: 1 UID: 0 PID: 17962 Comm: syz.9.2833 Tainted: G             L      syzkaller #0 PREEMPT(full) 
CPU: 1 UID: 0 PID: 17962 Comm: syz.9.2833 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0x13d/0x4b0 mm/kasan/report.c:482
 kasan_report+0xdf/0x1c0 mm/kasan/report.c:595
 check_region_inline mm/kasan/generic.c:186 [inline]
 kasan_check_range+0x10f/0x1e0 mm/kasan/generic.c:200
 __asan_memcpy+0x23/0x60 mm/kasan/shadow.c:105
 usb_copy_descriptors+0x18d/0x320 drivers/usb/gadget/config.c:94
 usb_assign_descriptors+0xd2/0x470 drivers/usb/gadget/config.c:131
 f_audio_bind+0x243a/0x3950 drivers/usb/gadget/function/f_uac1.c:1443
 usb_add_function+0x219/0x890 drivers/usb/gadget/composite.c:333
 configfs_composite_bind+0xd83/0x1960 drivers/usb/gadget/configfs.c:1802
 gadget_bind_driver+0x28c/0xbf0 drivers/usb/gadget/udc/core.c:1662
 call_driver_probe drivers/base/dd.c:628 [inline]
 really_probe+0x241/0xa60 drivers/base/dd.c:706
 __driver_probe_device+0x210/0x460 drivers/base/dd.c:868
 driver_probe_device+0x4a/0x140 drivers/base/dd.c:898
 __driver_attach+0x21f/0x5b0 drivers/base/dd.c:1292
 bus_for_each_dev+0x13e/0x1d0 drivers/base/bus.c:383
 bus_add_driver+0x305/0x5b0 drivers/base/bus.c:763
 driver_register+0x1e2/0x360 drivers/base/driver.c:174
 usb_gadget_register_driver_owner+0x132/0x210 drivers/usb/gadget/udc/core.c:1752
 gadget_dev_desc_UDC_store+0x1b0/0x2e0 drivers/usb/gadget/configfs.c:300
 flush_write_buffer fs/configfs/file.c:207 [inline]
 configfs_write_iter+0x302/0x4e0 fs/configfs/file.c:229
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6af/0x1050 fs/read_write.c:687
 ksys_write+0x12a/0x250 fs/read_write.c:739
 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: 0033:0x7f7bc159e159
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:00007f7bc2485028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f7bc1825fa0 RCX: 00007f7bc159e159
RDX: 000000000000000c RSI: 0000200000000480 RDI: 0000000000000045
RBP: 00007f7bc1635024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7bc1826038 R14: 00007f7bc1825fa0 R15: 00007ffe66b99068
 </TASK>

The buggy address belongs to the variable:
 ac_header_desc+0x0/0x40

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1bcb3
flags: 0xfff00000002000(reserved|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000002000 ffffea00006f2cc8 ffffea00006f2cc8 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner info is not present (never set?)

Memory state around the buggy address:
 ffffffff9bcb3a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffffff9bcb3b00: 00 00 00 00 00 00 00 00 f9 f9 f9 f9 00 f9 f9 f9
>ffffffff9bcb3b80: f9 f9 f9 f9 00 f9 f9 f9 f9 f9 f9 f9 00 f9 f9 f9
                                                          ^
 ffffffff9bcb3c00: f9 f9 f9 f9 00 00 f9 f9 f9 f9 f9 f9 00 00 f9 f9
 ffffffff9bcb3c80: f9 f9 f9 f9 00 00 f9 f9 f9 f9 f9 f9 00 00 f9 f9
==================================================================

Crashes (512):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/09/07 12:33 upstream 2beb1b31a12b 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/09/06 08:11 upstream 0d9ff90a5422 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/09/06 05:55 upstream 0d9ff90a5422 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/09/04 18:57 upstream 841e384b841a 3f042c7b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/08/31 09:52 upstream cee9395acd80 2f52988a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/08/30 01:58 upstream 08dbfad3f504 2f52988a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/08/26 18:30 upstream 45c13f3f9e3b a2b77b9e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/08/24 14:20 upstream 0a0d1d55dad5 23caa175 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/07/27 23:27 upstream f5098b6bae76 4cb2b096 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/07/25 22:28 upstream 0ce37745d4bf 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/07/25 05:01 upstream e2a936998ab2 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/07/24 13:30 upstream d326f83e819c 544adce9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/09/04 22:25 upstream bc35965f6940 44dda43b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/09/04 21:26 upstream bc35965f6940 44dda43b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/09/04 20:25 upstream bc35965f6940 44dda43b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/09/04 14:07 upstream bc35965f6940 44dda43b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/09/04 11:45 upstream bc35965f6940 44dda43b .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/09/04 09:03 upstream 8ab1afb2eb24 801f0966 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/09/04 06:35 upstream 8ab1afb2eb24 801f0966 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/08/31 00:24 upstream a23cbb05744b 2f52988a .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/08/30 19:44 upstream a23cbb05744b 2f52988a .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/08/30 15:37 upstream 08dbfad3f504 2f52988a .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/08/30 10:43 upstream 08dbfad3f504 2f52988a .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/08/30 08:08 upstream 08dbfad3f504 2f52988a .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/08/30 06:34 upstream 08dbfad3f504 2f52988a .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/08/29 23:33 upstream 08dbfad3f504 2f52988a .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/08/29 17:25 upstream cf72cbb39da8 2f52988a .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/08/29 12:16 upstream cf72cbb39da8 2f52988a .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/08/29 04:52 upstream cf72cbb39da8 2f52988a .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/08/28 22:19 upstream 818bebeb63dd 41d151d4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/08/28 21:18 upstream 818bebeb63dd 41d151d4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/08/28 14:08 upstream 818bebeb63dd 41d151d4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/09/08 12:31 upstream 28924df2a08f 351387c4 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/09/07 23:56 upstream 28924df2a08f 680aa3e1 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/09/07 02:42 upstream 1fc5a74b108f 4f7b22a0 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/09/06 03:17 upstream 9f0346dcbea3 4f7b22a0 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/09/05 07:45 upstream 654ae5d73c05 4f7b22a0 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/09/03 20:57 upstream 8ab1afb2eb24 d2e5fb95 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/08/31 11:50 upstream cee9395acd80 2f52988a .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/08/30 03:34 upstream 08dbfad3f504 2f52988a .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/08/29 14:02 upstream cf72cbb39da8 2f52988a .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/08/28 09:28 upstream 18fbf5151d2c e2fa417d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/08/28 06:39 upstream 18fbf5151d2c e2fa417d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/09/07 09:53 linux-next 9d80aa4617b3 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/09/04 04:50 linux-next 9d80aa4617b3 801f0966 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/09/03 10:43 linux-next 32b6ef9a5d0e 6a988719 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/09/02 15:59 linux-next 8b72f6626dc3 85995287 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/09/01 21:58 linux-next 8b72f6626dc3 587f6b29 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/08/31 21:24 linux-next 89c07d98716a 316d9396 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/08/29 20:47 linux-next e30626823a40 2f52988a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/08/29 07:33 linux-next e30626823a40 2f52988a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/08/29 01:04 linux-next 3d83758432b5 bcbc8ceb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/08/28 18:28 linux-next e30626823a40 bcbc8ceb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: global-out-of-bounds Read in usb_copy_descriptors
2026/08/28 08:04 linux-next 3d83758432b5 e2fa417d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root KASAN: global-out-of-bounds Read in usb_copy_descriptors
* Struck through repros no longer work on HEAD.