================================================================== BUG: KASAN: slab-use-after-free in vhci_tx_l[ 1069.318789][T27654] BUG: KASAN: slab-use-after-free in vhci_send_cmd_submit drivers/usb/usbip/vhci_tx.c:69 [inline] BUG: KASAN: slab-use-after-free in vhci_tx_l[ 1069.318789][T27654] BUG: KASAN: slab-use-after-free in vhci_tx_loop+0x3e9/0x1c70 drivers/usb/usbip/vhci_tx.c:241 Read of size 8 at addr ffff88806083e520 by task vhci_tx/27654 CPU: 0 UID: 0 PID: 27654 Comm: vhci_tx Tainted: G L syzkaller #0 PREEMPT_{RT,(full)} Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description+0x55/0x1e0 mm/kasan/report.c:378 print_report+0x58/0x70 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 vhci_send_cmd_submit drivers/usb/usbip/vhci_tx.c:69 [inline] vhci_tx_loop+0x3e9/0x1c70 drivers/usb/usbip/vhci_tx.c:241 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Allocated by task 5728: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x3d2/0x6b0 mm/slub.c:5515 _kmalloc_noprof include/linux/slab.h:969 [inline] _kzalloc_noprof include/linux/slab.h:1290 [inline] vhci_tx_urb drivers/usb/usbip/vhci_hcd.c:674 [inline] vhci_urb_enqueue+0x5c2/0xe00 drivers/usb/usbip/vhci_hcd.c:829 usb_hcd_submit_urb+0x322/0x1b40 drivers/usb/core/hcd.c:1542 usb_start_wait_urb+0x13f/0x5b0 drivers/usb/core/message.c:62 usb_internal_control_msg drivers/usb/core/message.c:117 [inline] usb_control_msg+0x234/0x3e0 drivers/usb/core/message.c:167 get_bMaxPacketSize0 drivers/usb/core/hub.c:4851 [inline] hub_port_init+0xb0b/0x28b0 drivers/usb/core/hub.c:5047 hub_port_connect drivers/usb/core/hub.c:5496 [inline] hub_port_connect_change drivers/usb/core/hub.c:5707 [inline] port_event drivers/usb/core/hub.c:5871 [inline] hub_event+0x24e2/0x4cf0 drivers/usb/core/hub.c:5953 process_one_work kernel/workqueue.c:3322 [inline] process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Freed by task 27653: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2705 [inline] slab_free mm/slub.c:6405 [inline] kfree+0x1c5/0x6c0 mm/slub.c:6720 pickup_urb_and_free_priv+0x225/0x3f0 drivers/usb/usbip/vhci_rx.c:46 vhci_recv_ret_submit drivers/usb/usbip/vhci_rx.c:65 [inline] vhci_rx_pdu drivers/usb/usbip/vhci_rx.c:242 [inline] vhci_rx_loop+0x3c5/0xa00 drivers/usb/usbip/vhci_rx.c:265 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 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 ffff88806083e500 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 32 bytes inside of freed 64-byte region [ffff88806083e500, ffff88806083e540) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88806083e900 pfn:0x6083e flags: 0x80000000000200(workingset|node=0|zone=1) page_type: f5(slab) raw: 0080000000000200 ffff88801a0178c0 ffffea0000e1ff10 ffff88801a016788 raw: ffff88806083e900 000000080020001f 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 5615, tgid 5615 (syz-executor), ts 87043077162, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1859 prep_new_page mm/page_alloc.c:1867 [inline] get_page_from_freelist+0x262a/0x26a0 mm/page_alloc.c:3946 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5304 alloc_slab_page mm/slub.c:3294 [inline] allocate_slab+0x79/0x5e0 mm/slub.c:3408 new_slab mm/slub.c:3454 [inline] refill_objects+0x2d8/0x350 mm/slub.c:7338 refill_sheaf mm/slub.c:2832 [inline] __pcs_replace_empty_main+0x330/0x690 mm/slub.c:4703 alloc_from_pcs mm/slub.c:4801 [inline] slab_alloc_node mm/slub.c:4933 [inline] __do_kmalloc_node mm/slub.c:5361 [inline] __kmalloc_noprof+0x544/0x780 mm/slub.c:5387 _kmalloc_noprof include/linux/slab.h:973 [inline] _kzalloc_noprof include/linux/slab.h:1290 [inline] kobject_get_path+0xc5/0x2f0 lib/kobject.c:161 kobject_uevent_env+0x2a1/0x9e0 lib/kobject_uevent.c:548 device_add+0x544/0xb80 drivers/base/core.c:3738 netdev_register_kobject+0x178/0x310 net/core/net-sysfs.c:2337 register_netdevice+0x1455/0x1ed0 net/core/dev.c:11440 veth_newlink+0x49f/0xb70 drivers/net/veth.c:1863 rtnl_newlink_create+0x310/0xb00 net/core/rtnetlink.c:3913 __rtnl_newlink net/core/rtnetlink.c:4044 [inline] rtnl_newlink+0x167f/0x1bd0 net/core/rtnetlink.c:4159 rtnetlink_rcv_msg+0x802/0xc00 net/core/rtnetlink.c:7076 page_owner free stack trace missing Memory state around the buggy address: ffff88806083e400: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc ffff88806083e480: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc >ffff88806083e500: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff88806083e580: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88806083e600: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================