c++ std::vector dont get raw data from subclass

hey guys i have a problem with the std::vector and i need your help. I am currently programming a rendering engine with the new vulkan api and i want to support different vertex layouts for different meshes. The problem is that std::vector::data() doesnt return the raw data i need. Here are my Vertex structs:

struct Vertex 
{
};
struct VertexColor : public Vertex
{
public:
    VertexColor(Vec3f pos, Vec3f col) : position(pos), color(col) {}
    Vec3f position;
    Vec3f color;
};

This is what i actually have and works:

     std::vector<VertexColor> cubeVertexBuffer = {
        VertexColor{ Vec3f( -1.0f, -1.0f, 1.0f ), Vec3f( 0.0f, 0.0f, 0.0f ) },
        VertexColor{ Vec3f( 1.0f, -1.0f, 1.0f  ), Vec3f( 1.0f, 0.0f, 0.0f ) },
        VertexColor{ Vec3f( 1.0f, 1.0f, 1.0f   ), Vec3f( 1.0f, 1.0f, 0.0f ) },
        VertexColor{ Vec3f( -1.0f, 1.0f, 1.0f  ), Vec3f( 0.0f, 1.0f, 0.0f ) },
        VertexColor{ Vec3f( -1.0f, -1.0f, -1.0f), Vec3f( 0.0f, 0.0f, 1.0f ) },
        VertexColor{ Vec3f( 1.0f, -1.0f, -1.0f ), Vec3f( 0.0f, 1.0f, 0.0f ) },
        VertexColor{ Vec3f( 1.0f, 1.0f, -1.0f  ), Vec3f( 1.0f, 1.0f, 0.0f ) },
        VertexColor{ Vec3f( -1.0f, 1.0f, -1.0f ), Vec3f( 1.0f, 0.0f, 0.0f ) }
};

uint32_t size = 8 * sizeof(VertexColor);
Vertex* vertices = (Vertex*)malloc(size);
memcpy(vertices, cubeVertexBuffer.data(), size);

std::vector<uint32_t> cubeIndexBuffer = { 1,2,0,  2,3,0,
                                          0,3,4,  3,7,4,
                                          5,1,4,  1,0,4,
                                          2,6,3,  6,7,3,
                                          5,6,1,  6,2,1,
                                          6,5,7,  5,4,7 };

Cube::cubeMesh = new Mesh(vertices, size, cubeIndexBuffer);

What i want:

    std::vector<Vertex> cubeVertexBuffer = {
        VertexColor{ Vec3f( -1.0f, -1.0f, 1.0f ), Vec3f( 0.0f, 0.0f, 0.0f ) },
        VertexColor{ Vec3f( 1.0f, -1.0f, 1.0f  ), Vec3f( 1.0f, 0.0f, 0.0f ) },
        VertexColor{ Vec3f( 1.0f, 1.0f, 1.0f   ), Vec3f( 1.0f, 1.0f, 0.0f ) },
        VertexColor{ Vec3f( -1.0f, 1.0f, 1.0f  ), Vec3f( 0.0f, 1.0f, 0.0f ) },
        VertexColor{ Vec3f( -1.0f, -1.0f, -1.0f), Vec3f( 0.0f, 0.0f, 1.0f ) },
        VertexColor{ Vec3f( 1.0f, -1.0f, -1.0f ), Vec3f( 0.0f, 1.0f, 0.0f ) },
        VertexColor{ Vec3f( 1.0f, 1.0f, -1.0f  ), Vec3f( 1.0f, 1.0f, 0.0f ) },
        VertexColor{ Vec3f( -1.0f, 1.0f, -1.0f ), Vec3f( 1.0f, 0.0f, 0.0f ) }
};

std::vector<uint32_t> cubeIndexBuffer = { 1,2,0,  2,3,0,
                                          0,3,4,  3,7,4,
                                          5,1,4,  1,0,4,
                                          2,6,3,  6,7,3,
                                          5,6,1,  6,2,1,
                                          6,5,7,  5,4,7 };

Cube::cubeMesh = new Mesh(cubeVertexBuffer, cubeIndexBuffer);

As i mentioned i need the whole vertex data in a raw format contigously in memory for mapping to the gpu, but the .data() function with the std::vector doesnt return the "real data". I dont know how i can using inheritation with the std::vector to get the "raw data from the subclass" in it. Hope you can help me! Thanks