CVE-2026-19936 Bluetooth Mesh delayable message queue: unsynchronized list access leads to NULL pointer dereference

The Bluetooth Mesh Access-layer delayable message queue in subsys/bluetooth/mesh/delayablemsg.c shares three intrusive lists busyctx, freectx, freechunks and one kworkdelayable between two cooperative threads with no synchronization: btmeshdelayablemsgmanage runs on the Bluetooth host RX thread,...