In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: hci_core: Serialize fragmented ISO packet queueing

The fragmented path in hci_queue_iso() calls __skb_queue_tail() without
holding conn->data_q.lock. The socket lock serializes senders, but the
transmit worker can concurrently remove packets from this queue using
skb_dequeue().

After an insertion saves the old tail pointer, hci_sched_iso() can dequeue
that packet and pass it to the driver. The driver can free the packet
before the insertion resumes and writes to the old tail's next pointer,
causing a use-after-free. Concurrent updates can also corrupt the queue.

KASAN reported:

  BUG: KASAN: slab-use-after-free in hci_send_iso+0xc7d/0xe10
  Call Trace:
   hci_send_iso+0xc7d/0xe10
   iso_sock_sendmsg+0x710/0x900
   __sys_sendto+0x34a/0x3a0

  Allocated by task 86:
   __alloc_skb+0xdd/0x820
   alloc_skb_with_frags+0x7e/0x770
   sock_alloc_send_pskb+0x67a/0x820
   bt_skb_sendmsg.constprop.0+0xc0/0x6c0
   iso_sock_sendmsg+0x44e/0x900

  Freed by task 90:
   kmem_cache_free+0xcb/0x3d0
   vhci_read+0x33f/0x4d0
   vfs_read+0x177/0xa20

Hold the queue lock across the entire fragment batch, as hci_queue_acl()
does, to serialize insertion against dequeue while preserving fragment
ordering.