diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6ca87dde74..4fde3ce39f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2066,6 +2066,12 @@ set_tests_properties(check_artifacts PROPERTIES
 	LABELS "validation;artifacts"
 	REQUIRED_FILES "${CMAKE_SOURCE_DIR}/release/idtech3_server")
 
+add_test(NAME regression_run_vulkan_launcher
+	COMMAND /usr/bin/env bash ${CMAKE_SOURCE_DIR}/tests/scripts/test_run_vulkan.sh ${CMAKE_SOURCE_DIR}/scripts/run_vulkan.sh
+	WORKING_DIRECTORY ${CMAKE_SOURCE_DIR})
+set_tests_properties(regression_run_vulkan_launcher PROPERTIES
+	LABELS "unit;regression;scripts")
+
 # --- Unit tests ---
 option(BUILD_UNIT_TESTS "Build unit tests" ON)
 if(BUILD_UNIT_TESTS)
diff --git a/tests/scripts/test_run_vulkan.sh b/tests/scripts/test_run_vulkan.sh
new file mode 100755
index 0000000000..e5c15e14f2
--- /dev/null
+++ b/tests/scripts/test_run_vulkan.sh
@@ -0,0 +1,118 @@
+#!/usr/bin/env bash
+# Regression tests for scripts/run_vulkan.sh launcher selection logic.
+set -euo pipefail
+
+SCRIPT_UNDER_TEST="${1:-}"
+if [ -z "$SCRIPT_UNDER_TEST" ] || [ ! -f "$SCRIPT_UNDER_TEST" ]; then
+  echo "Usage: $0 /absolute/path/to/scripts/run_vulkan.sh" >&2
+  exit 2
+fi
+
+fail() {
+  echo "FAIL: $*" >&2
+  exit 1
+}
+
+assert_contains() {
+  local haystack="$1"
+  local needle="$2"
+  local context="$3"
+  if [[ "$haystack" != *"$needle"* ]]; then
+    fail "$context: expected '$needle' in output: $haystack"
+  fi
+}
+
+assert_not_contains() {
+  local haystack="$1"
+  local needle="$2"
+  local context="$3"
+  if [[ "$haystack" == *"$needle"* ]]; then
+    fail "$context: unexpected '$needle' in output: $haystack"
+  fi
+}
+
+make_engine_stub() {
+  local path="$1"
+  local marker="$2"
+  cat > "$path" <<EOF
+#!/usr/bin/env bash
+echo "ENGINE_MARKER:${marker}"
+for arg in "\$@"; do
+  echo "ARG:\$arg"
+done
+EOF
+  chmod +x "$path"
+}
+
+make_uname_stub() {
+  local bin_dir="$1"
+  local machine="$2"
+  mkdir -p "$bin_dir"
+  cat > "$bin_dir/uname" <<EOF
+#!/usr/bin/env bash
+if [ "\${1:-}" = "-m" ]; then
+  echo "${machine}"
+  exit 0
+fi
+exec /usr/bin/uname "\$@"
+EOF
+  chmod +x "$bin_dir/uname"
+}
+
+run_launcher() {
+  local launcher="$1"
+  local machine="$2"
+  shift 2
+
+  local bin_dir="$TMP_ROOT/bin-${machine}"
+  make_uname_stub "$bin_dir" "$machine"
+
+  env -i \
+    PATH="$bin_dir:/usr/bin:/bin" \
+    HOME="$TMP_ROOT/home" \
+    bash "$launcher" "$@"
+}
+
+TMP_ROOT="$(mktemp -d)"
+trap 'rm -rf "$TMP_ROOT"' EXIT
+mkdir -p "$TMP_ROOT/home"
+
+# Case 1: When run from scripts/, prefer sibling ../release binary.
+CASE1="$TMP_ROOT/case1"
+mkdir -p "$CASE1/scripts" "$CASE1/release"
+cp "$SCRIPT_UNDER_TEST" "$CASE1/scripts/run_vulkan.sh"
+chmod +x "$CASE1/scripts/run_vulkan.sh"
+make_engine_stub "$CASE1/release/idtech3" "case1-release"
+make_engine_stub "$CASE1/scripts/idtech3" "case1-scripts"
+
+out_case1="$(run_launcher "$CASE1/scripts/run_vulkan.sh" "x86_64" +set cl_renderer vulkan)"
+assert_contains "$out_case1" "ENGINE_MARKER:case1-release" "case1 release preference"
+assert_not_contains "$out_case1" "ENGINE_MARKER:case1-scripts" "case1 release preference"
+assert_contains "$out_case1" "ARG:+set" "case1 arg forwarding"
+assert_contains "$out_case1" "ARG:cl_renderer" "case1 arg forwarding"
+assert_contains "$out_case1" "ARG:vulkan" "case1 arg forwarding"
+
+# Case 2: On aarch64, select idtech3.aarch64 when present.
+CASE2="$TMP_ROOT/case2"
+mkdir -p "$CASE2/release"
+cp "$SCRIPT_UNDER_TEST" "$CASE2/release/run_vulkan.sh"
+chmod +x "$CASE2/release/run_vulkan.sh"
+make_engine_stub "$CASE2/release/idtech3.aarch64" "case2-aarch64"
+make_engine_stub "$CASE2/release/idtech3" "case2-default"
+
+out_case2="$(run_launcher "$CASE2/release/run_vulkan.sh" "aarch64" +set r_mode -1)"
+assert_contains "$out_case2" "ENGINE_MARKER:case2-aarch64" "case2 aarch64 binary selection"
+assert_not_contains "$out_case2" "ENGINE_MARKER:case2-default" "case2 aarch64 binary selection"
+
+# Case 3: On aarch64, fall back to idtech3 when idtech3.aarch64 is missing.
+CASE3="$TMP_ROOT/case3"
+mkdir -p "$CASE3/release"
+cp "$SCRIPT_UNDER_TEST" "$CASE3/release/run_vulkan.sh"
+chmod +x "$CASE3/release/run_vulkan.sh"
+make_engine_stub "$CASE3/release/idtech3" "case3-default"
+
+out_case3="$(run_launcher "$CASE3/release/run_vulkan.sh" "aarch64" +set com_introplayed 1)"
+assert_contains "$out_case3" "ENGINE_MARKER:case3-default" "case3 aarch64 fallback"
+assert_contains "$out_case3" "ARG:+set" "case3 arg forwarding"
+
+echo "PASS: test_run_vulkan"