CVE-2026-64128

Description

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

References

• https://git.kernel.org/stable/c/1c3d1e1696b72579b970e17999c503a14535205b
• https://git.kernel.org/stable/c/39f4a82e80c8f5ed2d6952d73fbafc895721a728
• https://git.kernel.org/stable/c/3af41ee7ebecb0d5c8a504861f6cfad31345310f
• https://git.kernel.org/stable/c/61f2410a96dee808029e2ae4d6ef2dd635f3477f
• https://git.kernel.org/stable/c/84c24fb151fc1179355296d7ff29129ac7c42129