CVE-2026-19740

The Zephyr software Bluetooth LE Controller contains a vulnerability in its Link Layer Control Procedure (LLCP) implementation. Specifically, the functions llcp_lp_pu_rx() and llcp_rp_pu_rx() in subsys/bluetooth/controller/ll_sw/ull_llcp_phy.c fail to release a retained receive node when processi...

CVE-2026-19740 Bluetooth LE Controller: retained RX node leak and reachable assertion in the PHY Update procedure

The Link Layer Control Procedure LLCP implementation of the Zephyr software Bluetooth LE Controller retains the receive node that carried an accepted LLPHYUPDATEIND so that it can later be reused for the host notification when the update instant is reached llcprxnoderetain in...

CVE-2026-19739 Bluetooth LE controller leaks a retained RX node when an unexpected LL Control PDU arrives during a Connection Update

The Bluetooth Link Layer control procedure code in subsys/bluetooth/controller/llsw/ullllcpconnupd.c retains the received RX node while a Connection Update / Connection Parameter procedure waits for its instant, so the node can later carry the host notification llcprxnoderetain, which marks it...

CVE-2026-19739 Bluetooth LE controller leaks a retained RX node when an unexpected LL Control PDU arrives during a Connection Update

The Bluetooth Link Layer control procedure code in subsys/bluetooth/controller/llsw/ullllcpconnupd.c retains the received RX node while a Connection Update / Connection Parameter procedure waits for its instant, so the node can later carry the host notification llcprxnoderetain, which marks it...

CVE-2026-19739 Bluetooth LE controller leaks a retained RX node when an unexpected LL Control PDU arrives during a Connection Update

The Bluetooth Link Layer control procedure code in subsys/bluetooth/controller/llsw/ullllcpconnupd.c retains the received RX node while a Connection Update / Connection Parameter procedure waits for its instant, so the node can later carry the host notification llcprxnoderetain, which marks it...

CVE-2026-19738 Retained RX node leak and reachable assertion in Bluetooth Controller CIS Create procedures

The Bluetooth Link Layer Control Procedure LLCP implementation for Connected Isochronous Stream CIS creation retains an RX node ctx-noderef.rx, marked NODERXTYPERETAIN so it can later be reused as the host notification — on the peripheral while awaiting the Host's reply to an LLCISREQ, and on the...