static void set_pixel_format(VncState *vs,
                             int bits_per_pixel, int depth,
                             int big_endian_flag, int true_color_flag,
                             int red_max, int green_max, int blue_max,
                             int red_shift, int green_shift, int blue_shift)
{
    if (!true_color_flag) {
        vnc_client_error(vs);
         return;
     }
 
     vs->client_pf.rmax = red_max;
     vs->client_pf.rbits = hweight_long(red_max);
     vs->client_pf.rshift = red_shift;
    vs->client_pf.bytes_per_pixel = bits_per_pixel / 8;
    vs->client_pf.depth = bits_per_pixel == 32 ? 24 : bits_per_pixel;
    vs->client_be = big_endian_flag;

    set_pixel_conversion(vs);

    graphic_hw_invalidate(NULL);
    graphic_hw_update(NULL);
}

This category addresses vulnerabilities caused by flawed access control mechanisms, where incorrect permission settings allow unauthorized users to access restricted resources.