CVE-2026-98459

/// Technical description

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().

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References