CVE-2026-64128

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> Bluetooth: ISO: drop ISO_END frames received without prior ISO_START<br /> <br /> ISO data PDUs carry a packet-boundary flag indicating START, CONT, END<br /> or SINGLE. The ISO_CONT branch of iso_recv() guards against a missing<br /> ISO_START by checking conn-&gt;rx_len before touching conn-&gt;rx_skb, but<br /> ISO_END does not.<br /> <br /> If a peer sends an ISO_END as the first packet on a fresh ISO<br /> connection, conn-&gt;rx_skb is still NULL and conn-&gt;rx_len is zero, so<br /> skb_put(conn-&gt;rx_skb, ...) dereferences NULL and oopses. For BIS,<br /> where receivers sync to a broadcaster without pairing, any broadcaster<br /> on the air can trigger this.<br /> <br /> Mirror the ISO_CONT check at the top of ISO_END so a stray end fragment<br /> is logged and dropped instead of crashing the host.