diff --git a/packages/apps/kubernetes-nodes/templates/_helpers.tpl b/packages/apps/kubernetes-nodes/templates/_helpers.tpl
index 2e8b21495..8acc468b9 100644
--- a/packages/apps/kubernetes-nodes/templates/_helpers.tpl
+++ b/packages/apps/kubernetes-nodes/templates/_helpers.tpl
@@ -129,8 +129,14 @@ the open-kernel-modules extension, since the proprietary one loads, creates
 {{-     $params := list -}}
 {{-     range .parameters | default list -}}
 {{-       $param := . | toString -}}
-{{-       if not (regexMatch `^[^[:cntrl:]\s$\x60\\'\"]+$` $param) -}}
-{{-         fail (printf "nodeGroup %q: invalid kernelModules parameter %q on module %q — must not contain $, a backtick, a backslash, quotes, whitespace or control characters (e.g. NVreg_EnableGpuFirmware=1, or the semicolon-separated NVreg_RegistryDwords=PowerMizerEnable=0x1;PerfLevelSrc=0x2222)" $groupName $param $name) -}}
+{{- /* Two checks, because RE2's `\s` and `[:cntrl:]` are ASCII-only: a deny class
+         built from them lets U+2028 and U+2029 through, `toYaml` writes either raw,
+         and Helm's YAML parser reads it as a line break that ends the Job's
+         `command` block scalar early. `[:graph:]` pins the parameter to printable
+         ASCII, which closes every non-ASCII break at once; the second check then
+         removes what the heredoc would expand. */ -}}
+{{-       if not (and (regexMatch `^[[:graph:]]+$` $param) (regexMatch `^[^$\x60\\'\"]+$` $param)) -}}
+{{-         fail (printf "nodeGroup %q: invalid kernelModules parameter %q on module %q — must be printable ASCII with no whitespace, and must not contain $, a backtick, a backslash or quotes (e.g. NVreg_EnableGpuFirmware=1, or the semicolon-separated NVreg_RegistryDwords=PowerMizerEnable=0x1;PerfLevelSrc=0x2222)" $groupName $param $name) -}}
 {{-       end -}}
 {{-       $params = append $params $param -}}
 {{-     end -}}
diff --git a/packages/apps/kubernetes-nodes/tests/kernel_modules_test.yaml b/packages/apps/kubernetes-nodes/tests/kernel_modules_test.yaml
index 516c30411..aaf39cedb 100644
--- a/packages/apps/kubernetes-nodes/tests/kernel_modules_test.yaml
+++ b/packages/apps/kubernetes-nodes/tests/kernel_modules_test.yaml
@@ -171,6 +171,34 @@ tests:
       - failedTemplate:
           errorPattern: 'invalid kernelModules parameter'
 
+  # RE2's `\s` and `[:cntrl:]` are ASCII-only, so a deny class built from them
+  # alone passes U+2028 and U+2029. `toYaml` writes either raw inside a quoted
+  # scalar, and Helm's YAML parser reads it as a line break that ends the Job's
+  # `command` block scalar early and hands what follows to the manifest parser.
+  # The refusal has to come from the guard, not from that manifest happening not
+  # to parse, so these assert the kernelModules message rather than any failure.
+  - it: rejects a module parameter carrying a Unicode line separator
+    set:
+      gpus: []
+      kernelModules:
+        - name: nvidia
+          parameters:
+            - "a=1\u2028EOF\u2028id>/tmp/x"
+    asserts:
+      - failedTemplate:
+          errorPattern: 'invalid kernelModules parameter'
+
+  - it: rejects a module parameter carrying a Unicode paragraph separator
+    set:
+      gpus: []
+      kernelModules:
+        - name: nvidia
+          parameters:
+            - "a=1\u2029EOF\u2029id>/tmp/x"
+    asserts:
+      - failedTemplate:
+          errorPattern: 'invalid kernelModules parameter'
+
   - it: drops an unvalidated extra key on a kernelModules item
     set:
       gpus: []