syzbot


KASAN: slab-out-of-bounds Read in usbtmc_interrupt

Status: upstream: reported C repro on 2025/08/16 03:07
Subsystems: usb
[Documentation on labels]
Reported-by: syzbot+abbfd103085885cf16a2@syzkaller.appspotmail.com
First crash: 280d, last: 3d08h
✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision Error
9658e9e2-1f24-484d-9144-cd11c4852d74 assessment-security 💥 KASAN: slab-out-of-bounds Read in usbtmc_interrupt 2026/05/15 10:15 2026/05/15 10:15 2026/05/15 10:16 9cd3beaadf14b3a22d15fd97a0bf081ee41ebe01 failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "32" "ARCH=x86_64" "CC=ccache clang" "LD=ld.lld" "O=/app/workdir/cache/build/22322e9b459bd2b2974faf0a0d9c837ae79080c0" "-s" "bzImage" "compile_commands.json"]: exit status 2 * * Restart config... * * * General architecture-dependent options * SMT (Hyperthreading) scheduler support (SCHED_SMT) [Y/?] y Cluster scheduler support (SCHED_CLUSTER) [Y/n/?] y Multi-Core Cache (MC) scheduler support (SCHED_MC) [Y/n/?] y Kprobes (KPROBES) [N/y/?] n Optimize very unlikely/likely branches (JUMP_LABEL) [Y/n/?] y Static key selftest (STATIC_KEYS_SELFTEST) [N/y/?] n Static call selftest (STATIC_CALL_SELFTEST) [N/y/?] n Enable seccomp to safely execute untrusted bytecode (SECCOMP) [Y/n/?] y Show seccomp filter cache status in /proc/pid/seccomp_cache (SECCOMP_CACHE_DEBUG) [N/y/?] n Stack Protector buffer overflow detection (STACKPROTECTOR) [Y/n/?] y Strong Stack Protector (STACKPROTECTOR_STRONG) [Y/n/?] y Link Time Optimization (LTO) > 1. None (LTO_NONE) choice[1]: 1 Enable Clang's AutoFDO build (EXPERIMENTAL) (AUTOFDO_CLANG) [N/y/?] (NEW) Error in reading or end of file. Enable Clang's Propeller build (PROPELLER_CLANG) [N/y/?] (NEW) Error in reading or end of file. Use Kernel Control Flow Integrity (kCFI) (CFI) [N/y/?] (NEW) Error in reading or end of file. Number of bits to use for ASLR of mmap base address (ARCH_MMAP_RND_BITS) [28] 28 Number of bits to use for ASLR of mmap base address for compatible applications (ARCH_MMAP_RND_COMPAT_BITS) [8] 8 MMU page size > 1. 4KiB pages (PAGE_SIZE_4KB) choice[1]: 1 Provide system calls for 32-bit time_t (COMPAT_32BIT_TIME) [Y/n/?] y Use a virtually-mapped stack (VMAP_STACK) [Y/n/?] y Support for randomizing kernel stack offset on syscall entry (RANDOMIZE_KSTACK_OFFSET) [Y/n/?] y Default state of kernel stack offset randomization (RANDOMIZE_KSTACK_OFFSET_DEFAULT) [N/y/?] n Locking event counts collection (LOCK_EVENT_COUNTS) [N/y/?] n * * Memory initialization * Initialize kernel stack variables at function entry 1. no automatic stack variable initialization (weakest) (INIT_STACK_NONE) 2. pattern-init everything (strongest) (INIT_STACK_ALL_PATTERN) > 3. zero-init everything (strongest and safest) (INIT_STACK_ALL_ZERO) choice[1-3?]: 3 Poison kernel stack before returning from syscalls (KSTACK_ERASE) [N/y/?] (NEW) Error in reading or end of file. Enable heap memory zeroing on allocation by default (INIT_ON_ALLOC_DEFAULT_ON) [Y/n/?] y Enable heap memory zeroing on free by default (INIT_ON_FREE_DEFAULT_ON) [N/y/?] n Enable register zeroing on function exit (ZERO_CALL_USED_REGS) [N/y/?] n * * Kernel hardening options * Randomize layout of sensitive kernel structures > 1. Disable structure layout randomization (RANDSTRUCT_NONE) 2. Fully randomize structure layout (RANDSTRUCT_FULL) (NEW) choice[1-2?]: Error in reading or end of file. fatal error: error in backend: IO failure on output stream: No space left on device PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script. Stack dump: 0. Program arguments: /usr/bin/clang --target=x86_64-linux-gnu -fintegrated-as -Werror=unknown-warning-option -Werror=ignored-optimization-argument -Werror=option-ignored -Werror=unused-command-line-argument -fmacro-prefix-map=/app/workdir/cache/src/b51bb31b8e7636bbdb6b1ae67f4a1ca4e99f7e2d/= -std=gnu11 -fshort-wchar -funsigned-char -fno-common -fno-PIE -fno-strict-aliasing -mno-sse -mno-mmx -mno-sse2 -mno-3dnow -mno-avx -mno-sse4a -fcf-protection=branch -fno-jump-tables -m64 -falign-loops=1 -mno-80387 -mno-fp-ret-in-387 -mstack-alignment=8 -mskip-rax-setup -march=x86-64 -mtune=generic -mno-red-zone -mcmodel=kernel -mstack-protector-guard-reg=gs -mstack-protector-guard-symbol=__ref_stack_chk_guard -Wno-sign-compare -fno-asynchronous-unwind-tables -mretpoline-external-thunk -mindirect-branch-cs-prefix -mfunction-return=thunk-extern -fpatchable-function-entry=16,16 -fno-delete-null-pointer-checks -O2 -fst
Discussions (4)
Title Replies (including bot) Last reply
[PATCH v3 0/2] usb: usbtmc: add sanity checks for interrupt endpoints 4 (4) 2026/05/05 20:04
[PATCH v2] usb: usbtmc: reject invalid interrupt endpoints 7 (7) 2026/04/30 21:04
[PATCH] usb: usbtmc: Allocate enough space for interrupt-IN buffer 4 (4) 2026/04/23 13:03
[syzbot] [usb?] KASAN: slab-out-of-bounds Read in usbtmc_interrupt 6 (14) 2026/04/22 21:34
Last patch testing requests (17)
Created Duration User Patch Repo Result
2026/05/18 03:51 25m retest repro upstream report log
2026/04/22 21:34 39m halves@igalia.com patch upstream log
2026/04/09 19:38 20m retest repro https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing report log
2026/04/09 19:38 15m retest repro https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing report log
2026/03/26 18:51 1m retest repro linux-next error
2026/03/09 03:20 12m retest repro upstream report log
2026/01/29 18:59 15m retest repro https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing report log
2026/01/29 18:59 10m retest repro https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing report log
2026/01/15 18:10 22m retest repro linux-next report log
2025/11/20 17:11 37m retest repro https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing report log
2025/11/20 17:11 10m retest repro https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing report log
2025/08/17 06:07 23m hdanton@sina.com patch linux-next OK log
2025/08/17 05:01 20m hdanton@sina.com patch linux-next report log
2025/08/17 04:12 17m hdanton@sina.com patch linux-next report log
2025/08/17 02:49 21m hdanton@sina.com patch linux-next report log
2025/08/17 02:08 8m hdanton@sina.com patch linux-next error
2025/08/16 05:18 9m hdanton@sina.com patch linux-next error

Sample crash report:
usbtmc 5-1:16.0: invalid notification: 33
usbtmc 5-1:16.0: invalid notification: 36
usbtmc 5-1:16.0: invalid notification: 8
==================================================================
BUG: KASAN: slab-out-of-bounds in usbtmc_interrupt+0x68d/0x6a0 drivers/usb/class/usbtmc.c:2309
Read of size 1 at addr ffff88802284e281 by task swapper/1/0

CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
 <IRQ>
 __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+0x156/0x4c9 mm/kasan/report.c:482
 kasan_report+0xdf/0x1e0 mm/kasan/report.c:595
 usbtmc_interrupt+0x68d/0x6a0 drivers/usb/class/usbtmc.c:2309
 __usb_hcd_giveback_urb+0x38d/0x610 drivers/usb/core/hcd.c:1657
 usb_hcd_giveback_urb+0x3ca/0x4a0 drivers/usb/core/hcd.c:1741
 dummy_timer+0xd85/0x3670 drivers/usb/gadget/udc/dummy_hcd.c:1995
 __run_hrtimer kernel/time/hrtimer.c:1785 [inline]
 __hrtimer_run_queues+0x50e/0xa70 kernel/time/hrtimer.c:1849
 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1866
 handle_softirqs+0x1eb/0x9e0 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xef/0x150 kernel/softirq.c:723
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0xa3/0xc0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:63
Code: d8 82 02 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa eb 07 0f 00 2d 43 0c 1c 00 fb f4 <e9> bc 35 03 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffc90000177df0 EFLAGS: 00000206
RAX: 0000000000067e03 RBX: ffff88801e6ca480 RCX: ffffffff8b8f7c75
RDX: 0000000000000000 RSI: ffffffff8de71ed4 RDI: ffffffff8c1aefa0
RBP: 0000000000000001 R08: 0000000000000001 R09: ffffed100d4a6795
R10: ffff88806a533cab R11: 0000000000000000 R12: ffffed1003cd9490
R13: 0000000000000001 R14: ffffffff90d96410 R15: 0000000000000000
 arch_safe_halt arch/x86/include/asm/paravirt.h:73 [inline]
 default_idle+0x9/0x10 arch/x86/kernel/process.c:767
 default_idle_call+0x6c/0xb0 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:191 [inline]
 do_idle+0x35b/0x4b0 kernel/sched/idle.c:332
 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:430
 start_secondary+0x21d/0x2d0 arch/x86/kernel/smpboot.c:312
 common_startup_64+0x13e/0x148
 </TASK>

Allocated by task 29:
 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
 kasan_save_track+0x14/0x30 mm/kasan/common.c:78
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __do_kmalloc_node mm/slub.c:5219 [inline]
 __kmalloc_noprof+0x301/0x850 mm/slub.c:5231
 kmalloc_noprof include/linux/slab.h:966 [inline]
 usbtmc_probe+0xa41/0x1bc0 drivers/usb/class/usbtmc.c:2452
 usb_probe_interface+0x303/0x8f0 drivers/usb/core/driver.c:396
 call_driver_probe drivers/base/dd.c:583 [inline]
 really_probe+0x241/0xa60 drivers/base/dd.c:661
 __driver_probe_device+0x1de/0x400 drivers/base/dd.c:803
 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:833
 __device_attach_driver+0x1ff/0x3e0 drivers/base/dd.c:961
 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500
 __device_attach+0x1e4/0x4d0 drivers/base/dd.c:1033
 device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1088
 bus_probe_device+0x64/0x160 drivers/base/bus.c:574
 device_add+0x11d9/0x1950 drivers/base/core.c:3689
 usb_set_configuration+0xd97/0x1c60 drivers/usb/core/message.c:2208
 usb_generic_driver_probe+0xa1/0xe0 drivers/usb/core/generic.c:250
 usb_probe_device+0xef/0x400 drivers/usb/core/driver.c:291
 call_driver_probe drivers/base/dd.c:583 [inline]
 really_probe+0x241/0xa60 drivers/base/dd.c:661
 __driver_probe_device+0x1de/0x400 drivers/base/dd.c:803
 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:833
 __device_attach_driver+0x1ff/0x3e0 drivers/base/dd.c:961
 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500
 __device_attach+0x1e4/0x4d0 drivers/base/dd.c:1033
 device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1088
 bus_probe_device+0x64/0x160 drivers/base/bus.c:574
 device_add+0x11d9/0x1950 drivers/base/core.c:3689
 usb_new_device.cold+0x685/0x115c drivers/usb/core/hub.c:2695
 hub_port_connect drivers/usb/core/hub.c:5567 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
 port_event drivers/usb/core/hub.c:5871 [inline]
 hub_event+0x314d/0x4af0 drivers/usb/core/hub.c:5953
 process_one_work+0x9d7/0x1920 kernel/workqueue.c:3275
 process_scheduled_works kernel/workqueue.c:3358 [inline]
 worker_thread+0x5da/0xe40 kernel/workqueue.c:3439
 kthread+0x370/0x450 kernel/kthread.c:467
 ret_from_fork+0x754/0xd80 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

The buggy address belongs to the object at ffff88802284e280
 which belongs to the cache kmalloc-8 of size 8
The buggy address is located 0 bytes to the right of
 allocated 1-byte region [ffff88802284e280, ffff88802284e281)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2284e
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801b842500 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000800080 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 3014625096, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x153/0x170 mm/page_alloc.c:1889
 prep_new_page mm/page_alloc.c:1897 [inline]
 get_page_from_freelist+0x111d/0x3140 mm/page_alloc.c:3962
 __alloc_frozen_pages_noprof+0x27c/0x2ba0 mm/page_alloc.c:5250
 alloc_slab_page mm/slub.c:3255 [inline]
 allocate_slab mm/slub.c:3444 [inline]
 new_slab+0xa6/0x6d0 mm/slub.c:3502
 refill_objects+0x26b/0x400 mm/slub.c:7134
 refill_sheaf mm/slub.c:2804 [inline]
 alloc_full_sheaf mm/slub.c:2825 [inline]
 __pcs_replace_empty_main+0x19f/0x600 mm/slub.c:4588
 alloc_from_pcs mm/slub.c:4681 [inline]
 slab_alloc_node mm/slub.c:4815 [inline]
 __do_kmalloc_node mm/slub.c:5218 [inline]
 __kmalloc_noprof+0x688/0x850 mm/slub.c:5231
 kmalloc_noprof include/linux/slab.h:966 [inline]
 acpi_ex_allocate_name_string+0x8c/0x340 drivers/acpi/acpica/exnames.c:66
 acpi_ex_get_name_string+0x322/0xb90 drivers/acpi/acpica/exnames.c:367
 acpi_ds_create_operand+0x3fd/0xc20 drivers/acpi/acpica/dsutils.c:446
 acpi_ds_evaluate_name_path+0x158/0x4a0 drivers/acpi/acpica/dsutils.c:778
 acpi_ds_exec_end_op+0xb78/0x1e60 drivers/acpi/acpica/dswexec.c:374
 acpi_ps_parse_loop+0x5dd/0x24a0 drivers/acpi/acpica/psloop.c:525
 acpi_ps_parse_aml+0x81e/0x1120 drivers/acpi/acpica/psparse.c:475
 acpi_ps_execute_method+0x5c4/0xe90 drivers/acpi/acpica/psxface.c:190
 acpi_ns_evaluate+0x640/0x1670 drivers/acpi/acpica/nseval.c:205
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88802284e180: 04 fc fc fc 00 fc fc fc 06 fc fc fc fa fc fc fc
 ffff88802284e200: fa fc fc fc fa fc fc fc fa fc fc fc 00 fc fc fc
>ffff88802284e280: 01 fc fc fc fa fc fc fc 00 fc fc fc fa fc fc fc
                   ^
 ffff88802284e300: 00 fc fc fc fa fc fc fc 06 fc fc fc 00 fc fc fc
 ffff88802284e380: 00 fc fc fc 00 fc fc fc fa fc fc fc fa fc fc fc
==================================================================
----------------
Code disassembly (best guess):
   0:	d8 82 02 c3 cc cc    	fadds  -0x33333cfe(%rdx)
   6:	cc                   	int3
   7:	cc                   	int3
   8:	0f 1f 00             	nopl   (%rax)
   b:	90                   	nop
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	90                   	nop
  1b:	f3 0f 1e fa          	endbr64
  1f:	eb 07                	jmp    0x28
  21:	0f 00 2d 43 0c 1c 00 	verw   0x1c0c43(%rip)        # 0x1c0c6b
  28:	fb                   	sti
  29:	f4                   	hlt
* 2a:	e9 bc 35 03 00       	jmp    0x335eb <-- trapping instruction
  2f:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
  36:	00 00 00
  39:	66 90                	xchg   %ax,%ax
  3b:	90                   	nop
  3c:	90                   	nop
  3d:	90                   	nop
  3e:	90                   	nop
  3f:	90                   	nop

Crashes (5):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/02/23 03:03 upstream 189f164e573e 6e7b5511 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: slab-out-of-bounds Read in usbtmc_interrupt
2025/08/14 16:05 linux-next 931e46dcbc7e dcc075fb .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce KASAN: slab-out-of-bounds Read in usbtmc_interrupt
2025/08/14 12:35 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing c0485e864a2e 22ec1469 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-upstream-usb KASAN: slab-out-of-bounds Read in usbtmc_interrupt
2025/08/14 11:30 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing c0485e864a2e 22ec1469 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-upstream-usb KASAN: slab-out-of-bounds Read in usbtmc_interrupt
2025/08/14 10:25 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing c0485e864a2e 22ec1469 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-usb KASAN: slab-out-of-bounds Read in usbtmc_interrupt
* Struck through repros no longer work on HEAD.