drivers/bluetooth/virtio_bt.c in the Linux kernel before 5.16.3 has a memory leak (socket buffers have memory allocated but not freed).
https://lore.kernel.org/linux-bluetooth/1A203F5E-FB5E-430C-BEA3-86B191D69D58%40holtmann.org/
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.16.3
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.17