Bluetooth: hci4: unexpected cc 0x0c23 length: 249 > 4
Bluetooth: hci7: unexpected cc 0x0c23 length: 249 > 4
==================================================================
Bluetooth: hci7: unexpected cc 0x0c38 length: 249 > 2
BUG: KASAN: slab-use-after-free in hci_cmd_work+0x66d/0x6d0
Read of size 2 at addr ffff88800beeecb8 by task kworker/u11:3/315

CPU: 0 UID: 0 PID: 315 Comm: kworker/u11:3 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: hci6 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>

Bluetooth: hci4: unexpected cc 0x0c38 length: 249 > 2
Allocated by task 292:
 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 323:
 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
 vhci_read+0x3d5/0x5d0
 vfs_read+0x1eb/0xc70
 ksys_read+0x121/0x240
 do_syscall_64+0xbf/0x430
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88800beeec80
 which belongs to the cache skbuff_head_cache of size 232
The buggy address is located 56 bytes inside of
 freed 232-byte region [ffff88800beeec80, ffff88800beeed68)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xbeee
memcg:ffff88800e5d6981
flags: 0x100000000000000(node=0|zone=1)
page_type: f5(slab)
raw: 0100000000000000 ffff8880096c78c0 dead000000000100 dead000000000122
raw: 0000000000000000 00000000800c000c 00000000f5000000 ffff88800e5d6981
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88800beeeb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88800beeec00: fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc
>ffff88800beeec80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                        ^
 ffff88800beeed00: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc
 ffff88800beeed80: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
==================================================================
Bluetooth: hci0: command tx timeout
Bluetooth: hci1: command tx timeout
Bluetooth: hci3: command tx timeout
Bluetooth: hci7: command tx timeout
Bluetooth: hci2: command tx timeout
Bluetooth: hci5: command tx timeout
Bluetooth: hci6: command tx timeout
Bluetooth: hci4: command tx timeout
Bluetooth: hci0: command tx timeout
Bluetooth: hci1: command tx timeout
Bluetooth: hci3: command tx timeout
Bluetooth: hci2: command tx timeout
Bluetooth: hci7: command tx timeout
Bluetooth: hci5: command tx timeout
Bluetooth: hci6: command tx timeout
Bluetooth: hci4: command tx timeout
Bluetooth: hci0: command tx timeout
Bluetooth: hci1: command tx timeout
Bluetooth: hci3: command tx timeout
Bluetooth: hci7: command tx timeout
Bluetooth: hci2: command tx timeout
Bluetooth: hci5: command tx timeout
Bluetooth: hci6: command tx timeout
Bluetooth: hci4: command tx timeout
Bluetooth: hci0: command tx timeout
Bluetooth: hci1: command tx timeout
Bluetooth: hci3: command tx timeout
Bluetooth: hci2: command tx timeout
Bluetooth: hci7: command tx timeout
Bluetooth: hci5: command tx timeout
Bluetooth: hci6: command tx timeout
Bluetooth: hci4: command tx timeout