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================================================================== BUG: KASAN: use-after-free in __list_del_entry_valid+0x80/0x120 lib/list_debug.c:59 Read of size 8 at addr ffff88805f167520 by task syz.6.333/6459 CPU: 0 PID: 6459 Comm: syz.6.333 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 Call Trace: <TASK> dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106 print_address_description+0x60/0x2d0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xdf/0x130 mm/kasan/report.c:451 __list_del_entry_valid+0x80/0x120 lib/list_debug.c:59 __list_del_entry include/linux/list.h:132 [inline] list_del_init include/linux/list.h:204 [inline] bt_accept_unlink+0x35/0x230 net/bluetooth/af_bluetooth.c:209 l2cap_sock_teardown_cb+0x1af/0x380 net/bluetooth/l2cap_sock.c:1591 l2cap_chan_del+0xab/0x620 net/bluetooth/l2cap_core.c:656 l2cap_conn_del+0x3c1/0x6a0 net/bluetooth/l2cap_core.c:1931 hci_disconn_cfm include/net/bluetooth/hci_core.h:1520 [inline] hci_conn_hash_flush+0x107/0x220 net/bluetooth/hci_conn.c:1622 hci_dev_do_close+0x991/0x1030 net/bluetooth/hci_core.c:1795 hci_unregister_dev+0x2d7/0x580 net/bluetooth/hci_core.c:4044 vhci_release+0x73/0xc0 drivers/bluetooth/hci_vhci.c:345 __fput+0x234/0x930 fs/file_table.c:311 task_work_run+0x125/0x1a0 kernel/task_work.c:188 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0x626/0x20c0 kernel/exit.c:884 do_group_exit+0x12e/0x300 kernel/exit.c:998 get_signal+0x6d6/0x12d0 kernel/signal.c:2900 arch_do_signal_or_restart+0xe7/0x12c0 arch/x86/kernel/signal.c:867 handle_signal_work kernel/entry/common.c:154 [inline] exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7faced966e59 Code: Unable to access opcode bytes at RIP 0x7faced966e2f. RSP: 002b:00007facebb9f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: 000000000003e740 RBX: 00007facedbe0090 RCX: 00007faced966e59 RDX: 00000000fffffe66 RSI: 0000200000002940 RDI: 0000000000000004 RBP: 00007faced9fcd6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007facedbe0128 R14: 00007facedbe0090 R15: 00007ffcab6f2788 </TASK> Allocated by task 5908: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] __kasan_kmalloc+0xb5/0xf0 mm/kasan/common.c:522 kmalloc include/linux/slab.h:612 [inline] sk_prot_alloc+0xe7/0x210 net/core/sock.c:1866 sk_alloc+0x2f/0x310 net/core/sock.c:1922 l2cap_sock_alloc+0x33/0x200 net/bluetooth/l2cap_sock.c:1870 l2cap_sock_create+0x118/0x1d0 net/bluetooth/l2cap_sock.c:1918 bt_sock_create+0x155/0x220 net/bluetooth/af_bluetooth.c:130 __sock_create+0x47b/0x900 net/socket.c:1495 sock_create net/socket.c:1551 [inline] __sys_socket+0xe2/0x170 net/socket.c:1593 __do_sys_socket net/socket.c:1602 [inline] __se_sys_socket net/socket.c:1600 [inline] __x64_sys_socket+0x76/0x80 net/socket.c:1600 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff88805f167000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1312 bytes inside of 2048-byte region [ffff88805f167000, ffff88805f167800) The buggy address belongs to the page: page:ffffea00017c5800 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88805f160000 pfn:0x5f160 head:ffffea00017c5800 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0000a13408 ffffea0000a5f608 ffff888016c42000 raw: ffff88805f160000 0000000000080004 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d28c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 5395, ts 216534919509, free_ts 216496108935 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x1bbd/0x1ca0 mm/page_alloc.c:4192 __alloc_pages+0x1ee/0x480 mm/page_alloc.c:5501 alloc_slab_page mm/slub.c:1780 [inline] allocate_slab mm/slub.c:1917 [inline] new_slab+0xc0/0x4b0 mm/slub.c:1980 ___slab_alloc+0x80a/0xdd0 mm/slub.c:3013 __slab_alloc mm/slub.c:3100 [inline] slab_alloc_node mm/slub.c:3191 [inline] __kmalloc_node_track_caller+0x1fc/0x3a0 mm/slub.c:4963 kmalloc_reserve net/core/skbuff.c:356 [inline] pskb_expand_head+0x127/0x10f0 net/core/skbuff.c:1710 netlink_trim+0x180/0x220 net/netlink/af_netlink.c:1299 netlink_broadcast_filtered+0x7c/0x1170 net/netlink/af_netlink.c:1511 netlink_broadcast net/netlink/af_netlink.c:1556 [inline] nlmsg_multicast include/net/netlink.h:1044 [inline] nlmsg_notify+0xec/0x1a0 net/netlink/af_netlink.c:2550 rtnl_notify net/core/rtnetlink.c:764 [inline] rtmsg_ifinfo_send net/core/rtnetlink.c:3913 [inline] rtmsg_ifinfo_event net/core/rtnetlink.c:3928 [inline] rtnetlink_event+0x13a/0x1a0 net/core/rtnetlink.c:5738 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:391 call_netdevice_notifiers_extack net/core/dev.c:2074 [inline] call_netdevice_notifiers net/core/dev.c:2088 [inline] dev_set_mac_address+0x2e8/0x400 net/core/dev.c:9140 dev_set_mac_address_user+0x2d/0x50 net/core/dev.c:9154 do_setlink+0x8b0/0x3d60 net/core/rtnetlink.c:2739 __rtnl_newlink net/core/rtnetlink.c:3455 [inline] rtnl_newlink+0x1658/0x1a50 net/core/rtnetlink.c:3577 rtnetlink_rcv_msg+0x844/0xf30 net/core/rtnetlink.c:5687 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317 free_unref_page+0x8f/0x2a0 mm/page_alloc.c:3396 free_slab mm/slub.c:2020 [inline] discard_slab mm/slub.c:2026 [inline] __unfreeze_partials+0x1a5/0x200 mm/slub.c:2512 put_cpu_partial+0x12d/0x190 mm/slub.c:2592 qlist_free_all+0x35/0x90 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x150/0x160 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xd0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3225 [inline] slab_alloc mm/slub.c:3233 [inline] kmem_cache_alloc+0x100/0x290 mm/slub.c:3238 vm_area_alloc+0x20/0xe0 kernel/fork.c:350 __mmap_region mm/mmap.c:1782 [inline] mmap_region+0xac0/0x1650 mm/mmap.c:2933 do_mmap+0x819/0xe90 mm/mmap.c:1586 vm_mmap_pgoff+0x1c1/0x2d0 mm/util.c:551 ksys_mmap_pgoff+0x54b/0x790 mm/mmap.c:1635 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Memory state around the buggy address: ffff88805f167400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805f167480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88805f167500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805f167580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805f167600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================
| Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026/05/31 07:00 | linux-5.15.y | 241d66fa280c | 6b4a8443 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-linux-5-15-kasan | KASAN: use-after-free Read in bt_accept_unlink |