==================================================================
Bluetooth: hci0: Opcode 0x0c1a failed: -22
BUG: KASAN: slab-use-after-free in hci_cmd_work+0x66d/0x6d0
Read of size 2 at addr ffff88804b273cb8 by task kworker/u11:5/302

CPU: 0 UID: 0 PID: 302 Comm: kworker/u11:5 Not tainted 6.18.0-rc5-next-20251114 #1 PREEMPT(voluntary) 
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Workqueue: hci0 hci_cmd_work
Call Trace:
 <TASK>
 dump_stack_lvl+0xca/0x120
 print_report+0xcb/0x610
 kasan_report+0xca/0x100
 hci_cmd_work+0x66d/0x6d0
 process_one_work+0x8e1/0x19c0
 worker_thread+0x67e/0xe90
 kthread+0x3c8/0x740
 ret_from_fork+0x67a/0x7a0
 ret_from_fork_asm+0x1a/0x30
 </TASK>

Allocated by task 20755:
 kasan_save_stack+0x24/0x50
 kasan_save_track+0x14/0x30
 __kasan_slab_alloc+0x59/0x70
 kmem_cache_alloc_node_noprof+0x228/0x6b0
 __alloc_skb+0x2ab/0x370
 hci_cmd_sync_alloc+0x34/0x300
 __hci_cmd_sync_sk+0xf7/0x5c0
 __hci_cmd_sync_status_sk+0x4d/0x1a0
 hci_cmd_sync_status+0x4c/0x70
 hci_dev_cmd+0x4d5/0x980
 hci_sock_ioctl+0x493/0x810
 sock_do_ioctl+0xd1/0x240
 sock_ioctl+0x40d/0x630
 __x64_sys_ioctl+0x18f/0x210
 do_syscall_64+0xbf/0x430
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 302:
 kasan_save_stack+0x24/0x50
 kasan_save_track+0x14/0x30
 kasan_save_free_info+0x3a/0x60
 __kasan_slab_free+0x43/0x70
 kmem_cache_free+0x26f/0x500
 kfree_skbmem+0x18a/0x1f0
 sk_skb_reason_drop+0x10e/0x1b0
 hci_send_frame+0x3a1/0x420
 hci_cmd_work+0x281/0x6d0
 process_one_work+0x8e1/0x19c0
 worker_thread+0x67e/0xe90
 kthread+0x3c8/0x740
 ret_from_fork+0x67a/0x7a0
 ret_from_fork_asm+0x1a/0x30

The buggy address belongs to the object at ffff88804b273c80
 which belongs to the cache skbuff_head_cache of size 232
The buggy address is located 56 bytes inside of
 freed 232-byte region [ffff88804b273c80, ffff88804b273d68)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4b273
anon flags: 0x100000000000000(node=0|zone=1)
page_type: f5(slab)
raw: 0100000000000000 ffff8880096c78c0 0000000000000000 0000000000000001
raw: 0000000000000000 00000000800c000c 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88804b273b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88804b273c00: fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc
>ffff88804b273c80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                        ^
 ffff88804b273d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc
 ffff88804b273d80: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
==================================================================
Bluetooth: hci0: command tx timeout
FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
CPU: 1 UID: 0 PID: 20789 Comm: syz-executor.6 Tainted: G    B               6.18.0-rc5-next-20251114 #1 PREEMPT(voluntary) 
Tainted: [B]=BAD_PAGE
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xfa/0x120
 should_fail_ex+0x4d7/0x5e0
 _copy_from_user+0x30/0xd0
 hci_sock_ioctl+0x722/0x810
 sock_do_ioctl+0xd1/0x240
 sock_ioctl+0x40d/0x630
 __x64_sys_ioctl+0x18f/0x210
 do_syscall_64+0xbf/0x430
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8325681b19
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8322bf7188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f8325794f60 RCX: 00007f8325681b19
RDX: 0000000020000080 RSI: 00000000400448e7 RDI: 0000000000000005
RBP: 00007f8322bf71d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fffe8f74f1f R14: 00007f8322bf7300 R15: 0000000000022000
 </TASK>