CVE-2026-32724 PX4 autopilot has a heap Use-After-Free in MavlinkShell::available() via SERIAL_CONTROL Race Condition

PX4 autopilot is a flight control solution for drones. Prior to 1.17.0-rc1, a heap-use-after-free is detected in the MavlinkShell::available function. The issue is caused by a race condition between the MAVLink receiver thread which handles shell creation/destruction and the telemetry sender thre...