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KASAN: slab-use-after-free Read in read_report_descriptor

Status: premoderation: reported C repro on 2025/06/29 07:21
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+2b1f186fd55a4f8f9912@syzkaller.appspotmail.com
First crash: 246d, last: 7d11h
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2025/09/19 lts (merge base) d90ecb2b1308 syz [report] KASAN: slab-use-after-free Read in read_report_descriptor
2025/09/19 upstream (ToT) 1522b530ac3e syz [report] KASAN: slab-use-after-free Read in report_descriptor_read
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.6 KASAN: slab-use-after-free Read in read_report_descriptor 19 5 3d22h 206d 0/2 upstream: reported on 2025/08/07 13:50
▶ ▼ Last patch testing requests (5)
Created Duration User Patch Repo Result
2025/12/03 06:08 8m retest repro android16-6.12 error
2025/09/24 00:31 15m retest repro android16-6.12 report log
2025/09/13 10:42 17m retest repro android16-6.12 OK log
2025/07/15 15:24 18m retest repro android16-6.12 OK log
2025/07/15 15:24 14m retest repro android16-6.12 report log

Sample crash report:
==================================================================
BUG: KASAN: slab-use-after-free in read_report_descriptor+0xbf/0x100 drivers/hid/hid-core.c:2187
Read of size 7 at addr ffff8881163aa620 by task fido_id/1568

CPU: 1 UID: 0 PID: 1568 Comm: fido_id Not tainted syzkaller #0 b8f1b7d41e15bccc1ffab82bc6d1b1176d17ca88
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:94
 dump_stack_lvl+0x140/0x1c0 lib/dump_stack.c:120
 print_address_description+0x71/0x210 mm/kasan/report.c:377
 print_report+0x4a/0x70 mm/kasan/report.c:481
 kasan_report+0x162/0x1a0 mm/kasan/report.c:594
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x25a/0x2b0 mm/kasan/generic.c:189
 __asan_memcpy+0x31/0x80 mm/kasan/shadow.c:105
 read_report_descriptor+0xbf/0x100 drivers/hid/hid-core.c:2187
 sysfs_kf_bin_read+0x1c3/0x200 fs/sysfs/file.c:97
 kernfs_file_read_iter fs/kernfs/file.c:269 [inline]
 kernfs_fop_read_iter+0x30b/0x580 fs/kernfs/file.c:298
 new_sync_read fs/read_write.c:489 [inline]
 vfs_read+0x657/0xcb0 fs/read_write.c:570
 ksys_read+0x145/0x260 fs/read_write.c:713
 __do_sys_read fs/read_write.c:723 [inline]
 __se_sys_read fs/read_write.c:721 [inline]
 __x64_sys_read+0x7f/0x90 fs/read_write.c:721
 x64_sys_call+0x2638/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:1
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fd0538a7407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffd1dfd9d10 EFLAGS: 00000202 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007fd053fd7880 RCX: 00007fd0538a7407
RDX: 0000000000001000 RSI: 00007ffd1dfd9d60 RDI: 0000000000000004
RBP: 0000557da26242c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000557da26234c0
R13: 00007ffd1dfd9d60 R14: 0000000000000004 R15: 0000557d9381d4d8
 </TASK>

Allocated by task 420:
 kasan_save_stack mm/kasan/common.c:49 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:70
 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:565
 poison_kmalloc_redzone mm/kasan/common.c:379 [inline]
 __kasan_kmalloc+0x96/0xb0 mm/kasan/common.c:396
 kasan_kmalloc include/linux/kasan.h:261 [inline]
 __do_kmalloc_node mm/slub.c:4395 [inline]
 __kmalloc_node_track_caller_noprof+0x251/0x4f0 mm/slub.c:4414
 kmemdup_noprof+0x31/0x80 mm/util.c:139
 kmemdup_noprof include/linux/fortify-string.h:753 [inline]
 hid_open_report+0x200/0x1110 drivers/hid/hid-core.c:1273
 hid_parse include/linux/hid.h:1137 [inline]
 lg_probe+0x28b/0x950 drivers/hid/hid-lg.c:783
 __hid_device_probe drivers/hid/hid-core.c:2703 [inline]
 hid_device_probe+0x2c1/0x5d0 drivers/hid/hid-core.c:2740
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x2d5/0x890 drivers/base/dd.c:657
 __driver_probe_device+0x198/0x280 drivers/base/dd.c:799
 driver_probe_device+0x54/0x3f0 drivers/base/dd.c:829
 __device_attach_driver+0x2f1/0x4b0 drivers/base/dd.c:957
 bus_for_each_drv+0x264/0x300 drivers/base/bus.c:459
 __device_attach+0x2c9/0x3c0 drivers/base/dd.c:1029
 device_initial_probe+0x1e/0x30 drivers/base/dd.c:1078
 bus_probe_device+0x18b/0x270 drivers/base/bus.c:534
 device_add+0x80c/0xbf0 drivers/base/core.c:3692
 hid_add_device+0x39b/0x560 drivers/hid/hid-core.c:2886
 usbhid_probe+0xde3/0x12b0 drivers/hid/usbhid/hid-core.c:1435
 usb_probe_interface+0x6a9/0xc00 drivers/usb/core/driver.c:400
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x2d5/0x890 drivers/base/dd.c:657
 __driver_probe_device+0x198/0x280 drivers/base/dd.c:799
 driver_probe_device+0x54/0x3f0 drivers/base/dd.c:829
 __device_attach_driver+0x2f1/0x4b0 drivers/base/dd.c:957
 bus_for_each_drv+0x264/0x300 drivers/base/bus.c:459
 __device_attach+0x2c9/0x3c0 drivers/base/dd.c:1029
 device_initial_probe+0x1e/0x30 drivers/base/dd.c:1078
 bus_probe_device+0x18b/0x270 drivers/base/bus.c:534
 device_add+0x80c/0xbf0 drivers/base/core.c:3692
 usb_set_configuration+0x1acf/0x20b0 drivers/usb/core/message.c:2210
 usb_generic_driver_probe+0x95/0x160 drivers/usb/core/generic.c:254
 usb_probe_device+0x1d4/0x380 drivers/usb/core/driver.c:295
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x2d5/0x890 drivers/base/dd.c:657
 __driver_probe_device+0x198/0x280 drivers/base/dd.c:799
 driver_probe_device+0x54/0x3f0 drivers/base/dd.c:829
 __device_attach_driver+0x2f1/0x4b0 drivers/base/dd.c:957
 bus_for_each_drv+0x264/0x300 drivers/base/bus.c:459
 __device_attach+0x2c9/0x3c0 drivers/base/dd.c:1029
 device_initial_probe+0x1e/0x30 drivers/base/dd.c:1078
 bus_probe_device+0x18b/0x270 drivers/base/bus.c:534
 device_add+0x80c/0xbf0 drivers/base/core.c:3692
 usb_new_device+0x9f8/0x15b0 drivers/usb/core/hub.c:2703
 hub_port_connect drivers/usb/core/hub.c:5574 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5714 [inline]
 port_event drivers/usb/core/hub.c:5878 [inline]
 hub_event+0x30c6/0x4700 drivers/usb/core/hub.c:5960
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0x7d4/0x1020 kernel/workqueue.c:3319
 worker_thread+0xc70/0x10b0 kernel/workqueue.c:3400
 kthread+0x2c9/0x370 kernel/kthread.c:389
 ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Freed by task 420:
 kasan_save_stack mm/kasan/common.c:49 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:70
 kasan_save_free_info+0x4a/0x60 mm/kasan/generic.c:579
 poison_slab_object mm/kasan/common.c:249 [inline]
 __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:266
 kasan_slab_free include/linux/kasan.h:234 [inline]
 slab_free_hook mm/slub.c:2445 [inline]
 slab_free mm/slub.c:4714 [inline]
 kfree+0x158/0x440 mm/slub.c:4871
 hid_close_report+0x628/0x6f0 drivers/hid/hid-core.c:720
 __hid_device_probe drivers/hid/hid-core.c:2720 [inline]
 hid_device_probe+0x523/0x5d0 drivers/hid/hid-core.c:2740
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x2d5/0x890 drivers/base/dd.c:657
 __driver_probe_device+0x198/0x280 drivers/base/dd.c:799
 driver_probe_device+0x54/0x3f0 drivers/base/dd.c:829
 __device_attach_driver+0x2f1/0x4b0 drivers/base/dd.c:957
 bus_for_each_drv+0x264/0x300 drivers/base/bus.c:459
 __device_attach+0x2c9/0x3c0 drivers/base/dd.c:1029
 device_initial_probe+0x1e/0x30 drivers/base/dd.c:1078
 bus_probe_device+0x18b/0x270 drivers/base/bus.c:534
 device_add+0x80c/0xbf0 drivers/base/core.c:3692
 hid_add_device+0x39b/0x560 drivers/hid/hid-core.c:2886
 usbhid_probe+0xde3/0x12b0 drivers/hid/usbhid/hid-core.c:1435
 usb_probe_interface+0x6a9/0xc00 drivers/usb/core/driver.c:400
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x2d5/0x890 drivers/base/dd.c:657
 __driver_probe_device+0x198/0x280 drivers/base/dd.c:799
 driver_probe_device+0x54/0x3f0 drivers/base/dd.c:829
 __device_attach_driver+0x2f1/0x4b0 drivers/base/dd.c:957
 bus_for_each_drv+0x264/0x300 drivers/base/bus.c:459
 __device_attach+0x2c9/0x3c0 drivers/base/dd.c:1029
 device_initial_probe+0x1e/0x30 drivers/base/dd.c:1078
 bus_probe_device+0x18b/0x270 drivers/base/bus.c:534
 device_add+0x80c/0xbf0 drivers/base/core.c:3692
 usb_set_configuration+0x1acf/0x20b0 drivers/usb/core/message.c:2210
 usb_generic_driver_probe+0x95/0x160 drivers/usb/core/generic.c:254
 usb_probe_device+0x1d4/0x380 drivers/usb/core/driver.c:295
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x2d5/0x890 drivers/base/dd.c:657
 __driver_probe_device+0x198/0x280 drivers/base/dd.c:799
 driver_probe_device+0x54/0x3f0 drivers/base/dd.c:829
 __device_attach_driver+0x2f1/0x4b0 drivers/base/dd.c:957
 bus_for_each_drv+0x264/0x300 drivers/base/bus.c:459
 __device_attach+0x2c9/0x3c0 drivers/base/dd.c:1029
 device_initial_probe+0x1e/0x30 drivers/base/dd.c:1078
 bus_probe_device+0x18b/0x270 drivers/base/bus.c:534
 device_add+0x80c/0xbf0 drivers/base/core.c:3692
 usb_new_device+0x9f8/0x15b0 drivers/usb/core/hub.c:2703
 hub_port_connect drivers/usb/core/hub.c:5574 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5714 [inline]
 port_event drivers/usb/core/hub.c:5878 [inline]
 hub_event+0x30c6/0x4700 drivers/usb/core/hub.c:5960
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0x7d4/0x1020 kernel/workqueue.c:3319
 worker_thread+0xc70/0x10b0 kernel/workqueue.c:3400
 kthread+0x2c9/0x370 kernel/kthread.c:389
 ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

The buggy address belongs to the object at ffff8881163aa620
 which belongs to the cache kmalloc-8 of size 8
The buggy address is located 0 bytes inside of
 freed 8-byte region [ffff8881163aa620, ffff8881163aa628)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1163aa
flags: 0x4000000000000000(zone=1)
page_type: f5(slab)
raw: 4000000000000000 ffff888100041500 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000800080 00000001f5000000 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 0x152cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 379, tgid 379 (syz-executor), ts 27776134983, free_ts 27766915663
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook+0x3b8/0x3f0 mm/page_alloc.c:1826
 prep_new_page+0x20/0x120 mm/page_alloc.c:1834
 get_page_from_freelist+0x496e/0x4a20 mm/page_alloc.c:3915
 __alloc_pages_noprof+0x35f/0x7e0 mm/page_alloc.c:5265
 alloc_slab_page+0x6b/0x1e0 mm/slub.c:-1
 allocate_slab+0x69/0x420 mm/slub.c:2687
 new_slab mm/slub.c:2741 [inline]
 ___slab_alloc+0x5a2/0x8d0 mm/slub.c:3934
 __slab_alloc mm/slub.c:4025 [inline]
 __slab_alloc_node mm/slub.c:4078 [inline]
 slab_alloc_node mm/slub.c:4239 [inline]
 __do_kmalloc_node mm/slub.c:4394 [inline]
 __kmalloc_node_track_caller_noprof+0x2e6/0x4f0 mm/slub.c:4414
 kvasprintf+0xf1/0x260 lib/kasprintf.c:25
 kvasprintf_const+0xf6/0x250 lib/kasprintf.c:49
 kobject_set_name_vargs+0x65/0x120 lib/kobject.c:274
 kobject_add_varg lib/kobject.c:368 [inline]
 kobject_init_and_add+0xef/0x1a0 lib/kobject.c:457
 rx_queue_add_kobject net/core/net-sysfs.c:1105 [inline]
 net_rx_queue_update_kobjects+0x1f5/0x5a0 net/core/net-sysfs.c:1160
 register_queue_kobjects net/core/net-sysfs.c:1894 [inline]
 netdev_register_kobject+0x26d/0x360 net/core/net-sysfs.c:2139
 register_netdevice+0xf92/0x19d0 net/core/dev.c:10583
 veth_newlink+0x5be/0xc20 drivers/net/veth.c:1868
page last free pid 378 tgid 378 stack trace:
 reset_page_owner include/linux/page_owner.h:28 [inline]
 free_pages_prepare mm/page_alloc.c:1352 [inline]
 free_unref_page+0xbcf/0xf80 mm/page_alloc.c:2843
 __free_pages+0x6b/0x3b0 mm/page_alloc.c:5352
 __free_slab+0xb5/0x110 mm/slub.c:2758
 free_slab+0x18/0xe0 mm/slub.c:2781
 discard_slab mm/slub.c:2787 [inline]
 __put_partials+0x11b/0x150 mm/slub.c:3256
 put_cpu_partial+0x91/0xc0 mm/slub.c:3331
 __slab_free+0x1cf/0x2a0 mm/slub.c:4584
 do_slab_free mm/slub.c:4666 [inline]
 ___cache_free+0xc9/0xe0 mm/slub.c:4777
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0xb5/0x130 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x14f/0x180 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x28/0x90 mm/kasan/common.c:331
 kasan_slab_alloc include/linux/kasan.h:251 [inline]
 slab_post_alloc_hook mm/slub.c:4202 [inline]
 slab_alloc_node mm/slub.c:4251 [inline]
 __do_kmalloc_node mm/slub.c:4394 [inline]
 __kmalloc_node_noprof+0x1fd/0x4f0 mm/slub.c:4401
 __kvmalloc_node_noprof+0x128/0x300 mm/util.c:672
 alloc_netdev_mqs+0xb6/0x13c0 net/core/dev.c:11189
 rtnl_create_link+0x324/0xe20 net/core/rtnetlink.c:3406
 rtnl_newlink_create net/core/rtnetlink.c:3532 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3762 [inline]
 rtnl_newlink+0x1457/0x2240 net/core/rtnetlink.c:3775

Memory state around the buggy address:
 ffff8881163aa500: 06 fc fc fc 05 fc fc fc 06 fc fc fc 05 fc fc fc
 ffff8881163aa580: 06 fc fc fc 05 fc fc fc 06 fc fc fc 06 fc fc fc
>ffff8881163aa600: 05 fc fc fc fa fc fc fc fa fc fc fc 06 fc fc fc
                               ^
 ffff8881163aa680: fa fc fc fc 05 fc fc fc fa fc fc fc 00 fc fc fc
 ffff8881163aa700: 05 fc fc fc 05 fc fc fc 05 fc fc fc fa fc fc fc
==================================================================

Crashes (15):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/02/14 01:37 android16-6.12 a18295bb2ff6 1e62d198 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust KASAN: slab-use-after-free Read in read_report_descriptor
2025/06/29 10:12 android16-6.12 68f4f0b0690a fc9d8ee5 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust KASAN: slab-use-after-free Read in read_report_descriptor
2026/02/23 00:26 android16-6.12 c190014704c7 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust KASAN: slab-use-after-free Read in read_report_descriptor
2026/02/13 22:47 android16-6.12 a18295bb2ff6 1e62d198 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust KASAN: slab-use-after-free Read in read_report_descriptor
2026/02/13 15:19 android16-6.12 9d9c7472ef9e 6a673c50 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust KASAN: slab-use-after-free Read in read_report_descriptor
2026/01/31 04:11 android16-6.12 c13babfee861 c75a2f6e .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust KASAN: slab-use-after-free Read in read_report_descriptor
2025/10/28 12:17 android16-6.12 0d6730ee6542 fd2207e7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust KASAN: slab-use-after-free Read in read_report_descriptor
2025/10/16 18:24 android16-6.12 101347b9f28f 19568248 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust KASAN: slab-use-after-free Read in read_report_descriptor
2025/08/30 10:26 android16-6.12 6879524e1c5a 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust KASAN: slab-use-after-free Read in read_report_descriptor
2025/07/01 13:00 android16-6.12 648383294760 6e83b42d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust KASAN: slab-use-after-free Read in read_report_descriptor
2025/06/30 20:00 android16-6.12 668635cd345a 6e83b42d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust KASAN: slab-use-after-free Read in read_report_descriptor
2025/06/30 02:36 android16-6.12 68f4f0b0690a fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust KASAN: slab-use-after-free Read in read_report_descriptor
2025/06/29 19:56 android16-6.12 68f4f0b0690a fc9d8ee5 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust KASAN: slab-use-after-free Read in read_report_descriptor
2025/06/29 14:51 android16-6.12 68f4f0b0690a fc9d8ee5 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust KASAN: slab-use-after-free Read in read_report_descriptor
2025/06/29 07:20 android16-6.12 68f4f0b0690a fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust KASAN: slab-use-after-free Read in read_report_descriptor
* Struck through repros no longer work on HEAD.