diff --git a/components/ulp/cmake/IDFULPProject.cmake b/components/ulp/cmake/IDFULPProject.cmake
index fbab4d6992..ec5d85e9db 100644
--- a/components/ulp/cmake/IDFULPProject.cmake
+++ b/components/ulp/cmake/IDFULPProject.cmake
@@ -49,7 +49,7 @@ function(ulp_apply_default_sources ulp_app_name)
     list(APPEND ULP_PREPRO_ARGS -I${sdkconfig_dir})
     list(APPEND ULP_PREPRO_ARGS -I${IDF_PATH}/components/esp_system/ld)
 
-    target_include_directories(${ulp_app_name} PRIVATE ${COMPONENT_INCLUDES})
+    target_include_directories(${ulp_app_name} PRIVATE ${COMPONENT_INCLUDES} ${sdkconfig_dir})
 
     # Pre-process the linker script
     if(CONFIG_ULP_COPROC_TYPE_RISCV)
diff --git a/tools/cmakev2/kconfig.cmake b/tools/cmakev2/kconfig.cmake
index a4b08c5a53..de38a6ab7b 100644
--- a/tools/cmakev2/kconfig.cmake
+++ b/tools/cmakev2/kconfig.cmake
@@ -656,12 +656,18 @@ function(__generate_kconfig_outputs)
     set_property(DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}" APPEND PROPERTY
                 ADDITIONAL_CLEAN_FILES "${sdkconfig_header}" "${sdkconfig_cmake}")
 
-    # Store output paths in build properties
+    # Store output paths in build properties (internal)
     idf_build_set_property(__SDKCONFIG_HEADER "${sdkconfig_header}")
     idf_build_set_property(__SDKCONFIG_CMAKE "${sdkconfig_cmake}")
     idf_build_set_property(__SDKCONFIG_JSON "${sdkconfig_json}")
     idf_build_set_property(__SDKCONFIG_JSON_MENUS "${sdkconfig_json_menus}")
 
+    # Public aliases for backward compatibility with components (e.g. ULP)
+    idf_build_set_property(SDKCONFIG_HEADER "${sdkconfig_header}")
+    idf_build_set_property(SDKCONFIG_CMAKE "${sdkconfig_cmake}")
+    idf_build_set_property(SDKCONFIG_JSON "${sdkconfig_json}")
+    idf_build_set_property(SDKCONFIG_JSON_MENUS "${sdkconfig_json_menus}")
+
     idf_msg("Generated Kconfig outputs in ${config_dir}")
 endfunction()
 
diff --git a/tools/cmakev2/project.cmake b/tools/cmakev2/project.cmake
index c4da93808a..b26a9a49a1 100644
--- a/tools/cmakev2/project.cmake
+++ b/tools/cmakev2/project.cmake
@@ -604,6 +604,15 @@ macro(idf_project_init)
         # Ensure this is done after including the sdkconfig.
         __init_idf_target_arch()
 
+        # Make build properties available as CMake variables for backward
+        # compatibility with project_include.cmake files (e.g. ULP component
+        # references ${SDKCONFIG_HEADER} and ${SDKCONFIG_CMAKE} directly).
+        idf_build_get_property(build_properties BUILD_PROPERTIES)
+        foreach(build_property IN LISTS build_properties)
+            idf_build_get_property(val ${build_property})
+            set(${build_property} "${val}")
+        endforeach()
+
         # Include all project_include.cmake files for the components that have
         # been discovered.
         idf_build_get_property(component_interfaces COMPONENT_INTERFACES)