diff --git a/CMakeLists.txt b/CMakeLists.txt
index 81da07aeb1a..000122f35e5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -192,13 +192,6 @@ include_directories(${CMAKE_CURRENT_BINARY_DIR}/Userland/Services)
 include_directories(${CMAKE_CURRENT_BINARY_DIR}/Userland/Libraries)
 include_directories(${CMAKE_CURRENT_BINARY_DIR}/Userland)
 
-# FIXME: vptr sanitizing requires.. intense ABI wrangling of std::type_info
-#     And would be better served by porting ubsan_type_hash_itanium.cpp from compiler-rt
-if (ENABLE_UNDEFINED_SANITIZER)
-    add_compile_options(-fsanitize=undefined -fno-sanitize=vptr)
-    add_link_options(-fsanitize=undefined -fno-sanitize=vptr)
-endif()
-
 add_custom_target(components ALL)
 option(BUILD_EVERYTHING "Build all optional components" ON)
 
@@ -219,6 +212,17 @@ endif()
 add_subdirectory(AK)
 add_subdirectory(Kernel)
 
+# FIXME: vptr sanitizing requires.. intense ABI wrangling of std::type_info
+#        And would be better served by porting ubsan_type_hash_itanium.cpp from compiler-rt
+if (ENABLE_UNDEFINED_SANITIZER)
+    add_compile_options(-fsanitize=undefined -fno-sanitize=vptr)
+    add_link_options(-fsanitize=undefined -fno-sanitize=vptr)
+
+    if (UNDEFINED_BEHAVIOR_IS_FATAL)
+        add_compile_options(-fno-sanitize-recover=undefined)
+    endif()
+endif()
+
 if (ENABLE_MOLD_LINKER)
     add_link_options(-fuse-ld=mold)
 endif()
diff --git a/Documentation/AdvancedBuildInstructions.md b/Documentation/AdvancedBuildInstructions.md
index 521fa49b557..7b7aae98649 100644
--- a/Documentation/AdvancedBuildInstructions.md
+++ b/Documentation/AdvancedBuildInstructions.md
@@ -46,7 +46,8 @@ There are some optional features that can be enabled during compilation that are
 - `ENABLE_KERNEL_COVERAGE_COLLECTION`: enables the KCOV API and kernel coverage collection instrumentation. Only useful for coverage guided kernel fuzzing.
 - `ENABLE_USERSPACE_COVERAGE_COLLECTION`: enables coverage collection instrumentation for userspace. Currently only works with a Clang build.
 - `ENABLE_MEMORY_SANITIZER`: enables runtime checks for uninitialized memory accesses in Lagom test cases.
-- `ENABLE_UNDEFINED_SANITIZER`: builds in runtime checks for [undefined behavior](https://en.wikipedia.org/wiki/Undefined_behavior) (like null pointer dereferences and signed integer overflows) in Lagom test cases.
+- `ENABLE_UNDEFINED_SANITIZER`: builds in runtime checks for [undefined behavior](https://en.wikipedia.org/wiki/Undefined_behavior) (like null pointer dereferences and signed integer overflows) in Lagom and the SerenityOS userland.
+- `UNDEFINED_BEHAVIOR_IS_FATAL`: makes all undefined behavior sanitizer errors non-recoverable. This option reduces the performance overhead of `ENABLE_UNDEFINED_SANITIZER`.
 - `ENABLE_COMPILER_EXPLORER_BUILD`: Skip building non-library entities in Lagom (this only applies to Lagom).
 - `ENABLE_FUZZERS`: builds [fuzzers](../Meta/Lagom/ReadMe.md#fuzzing) for various parts of the system.
 - `ENABLE_FUZZERS_LIBFUZZER`: builds Clang libFuzzer-based [fuzzers](../Meta/Lagom/ReadMe.md#fuzzing) for various parts of the system.
diff --git a/Ladybird/CMakeLists.txt b/Ladybird/CMakeLists.txt
index 00c4a123d5e..39378b3c5a3 100644
--- a/Ladybird/CMakeLists.txt
+++ b/Ladybird/CMakeLists.txt
@@ -41,6 +41,9 @@ endif()
 
 if (ENABLE_UNDEFINED_SANITIZER)
     add_compile_options(-fsanitize=undefined -fno-omit-frame-pointer)
+    if (UNDEFINED_BEHAVIOR_IS_FATAL)
+        add_compile_options(-fno-sanitize-recover=undefined)
+    endif()
     add_link_options(-fsanitize=undefined)
 endif()
 
diff --git a/Meta/CMake/common_options.cmake b/Meta/CMake/common_options.cmake
index 7b9c504df0c..7cd1aca6af1 100644
--- a/Meta/CMake/common_options.cmake
+++ b/Meta/CMake/common_options.cmake
@@ -9,6 +9,7 @@ endif()
 
 serenity_option(ENABLE_COMPILETIME_FORMAT_CHECK ON CACHE BOOL "Enable compiletime format string checks")
 serenity_option(ENABLE_UNDEFINED_SANITIZER OFF CACHE BOOL "Enable undefined behavior sanitizer testing in gcc/clang")
+serenity_option(UNDEFINED_BEHAVIOR_IS_FATAL OFF CACHE BOOL "Make undefined behavior sanitizer errors non-recoverable")
 
 serenity_option(ENABLE_ALL_THE_DEBUG_MACROS OFF CACHE BOOL "Enable all debug macros to validate they still compile")
 serenity_option(ENABLE_ALL_DEBUG_FACILITIES OFF CACHE BOOL "Enable all noisy debug symbols and options. Not recommended for normal developer use")
diff --git a/Meta/Lagom/CMakeLists.txt b/Meta/Lagom/CMakeLists.txt
index 4a347495924..5d300fe58ba 100644
--- a/Meta/Lagom/CMakeLists.txt
+++ b/Meta/Lagom/CMakeLists.txt
@@ -119,6 +119,9 @@ endif()
 
 if (ENABLE_UNDEFINED_SANITIZER)
     add_compile_options(-fsanitize=undefined -fno-omit-frame-pointer)
+    if (UNDEFINED_BEHAVIOR_IS_FATAL)
+        add_compile_options(-fno-sanitize-recover=undefined)
+    endif()
     set(LINKER_FLAGS "${LINKER_FLAGS} -fsanitize=undefined")
 endif()