CVE-2026-98459

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

Bluetooth: ISO: balance the parent hold in hci_bind_bis()

hci_conn_link() takes a lifetime reference to its parent with

hci_conn_get(), but only takes an operational hold on the child.

hci_conn_unlink() later balances both a hold and a reference on the

parent.

The SCO and CIS paths pass a parent acquired from a connect helper, so

it already has a hold. For an additional BIS, hci_bind_bis() obtains the

parent from hci_conn_hash_lookup_big(), which returns a bare pointer.

Unlinking the child then drops the parent's existing hold and can

schedule it for disconnection while its socket is still using it.

Take a hold on the parent before linking it and drop that hold if linking

fails. A successful link transfers the hold to hci_conn_unlink().