diff --git a/pkg/apis/resource/validation/validation.go b/pkg/apis/resource/validation/validation.go
index 7dc902dd354..ca7611cc66c 100644
--- a/pkg/apis/resource/validation/validation.go
+++ b/pkg/apis/resource/validation/validation.go
@@ -256,7 +256,7 @@ func validateDeviceConfiguration(config resource.DeviceConfiguration, fldPath *f
 func validateOpaqueConfiguration(config resource.OpaqueDeviceConfiguration, fldPath *field.Path, stored bool) field.ErrorList {
 	var allErrs field.ErrorList
 	allErrs = append(allErrs, validateDriverName(config.Driver, fldPath.Child("driver"))...)
-	allErrs = append(allErrs, validateRawExtension(config.Parameters, fldPath.Child("parameters"))...)
+	allErrs = append(allErrs, validateRawExtension(config.Parameters, fldPath.Child("parameters"), stored)...)
 	return allErrs
 }
 
@@ -750,18 +750,24 @@ func validateDeviceStatus(device resource.AllocatedDeviceStatus, fldPath *field.
 	}
 	allErrs = append(allErrs, metav1validation.ValidateConditions(device.Conditions, fldPath.Child("conditions"))...)
 	if len(device.Data.Raw) > 0 { // Data is an optional field.
-		allErrs = append(allErrs, validateRawExtension(device.Data, fldPath.Child("data"))...)
+		allErrs = append(allErrs, validateRawExtension(device.Data, fldPath.Child("data"), false)...)
 	}
 	allErrs = append(allErrs, validateNetworkDeviceData(device.NetworkData, fldPath.Child("networkData"))...)
 	return allErrs
 }
 
 // validateRawExtension validates RawExtension as in https://github.com/kubernetes/kubernetes/pull/125549/
-func validateRawExtension(rawExtension runtime.RawExtension, fldPath *field.Path) field.ErrorList {
+func validateRawExtension(rawExtension runtime.RawExtension, fldPath *field.Path, stored bool) field.ErrorList {
 	var allErrs field.ErrorList
 	var v any
 	if len(rawExtension.Raw) == 0 {
 		allErrs = append(allErrs, field.Required(fldPath, ""))
+	} else if !stored && len(rawExtension.Raw) > resource.OpaqueParametersMaxLength {
+		// Don't even bother with parsing when too large.
+		// Only applies on create. Existing parameters are grand-fathered in
+		// because the limit was introduced in 1.32. This also means that it
+		// can be changed in the future.
+		allErrs = append(allErrs, field.TooLong(fldPath, "" /* unused */, resource.OpaqueParametersMaxLength))
 	} else if err := json.Unmarshal(rawExtension.Raw, &v); err != nil {
 		allErrs = append(allErrs, field.Invalid(fldPath, "<value omitted>", fmt.Sprintf("error parsing data as JSON: %v", err.Error())))
 	} else if v == nil {
diff --git a/pkg/apis/resource/validation/validation_resourceclaim_test.go b/pkg/apis/resource/validation/validation_resourceclaim_test.go
index 7089acc7b9b..50b32312677 100644
--- a/pkg/apis/resource/validation/validation_resourceclaim_test.go
+++ b/pkg/apis/resource/validation/validation_resourceclaim_test.go
@@ -1096,6 +1096,24 @@ func TestValidateClaimStatusUpdate(t *testing.T) {
 			},
 			deviceStatusFeatureGate: true,
 		},
+		"invalid-data-device-status-too-long": {
+			wantFailures: field.ErrorList{
+				field.TooLong(field.NewPath("status", "devices").Index(0).Child("data"), "" /* unused */, resource.OpaqueParametersMaxLength),
+			},
+			oldClaim: func() *resource.ResourceClaim { return validAllocatedClaim }(),
+			update: func(claim *resource.ResourceClaim) *resource.ResourceClaim {
+				claim.Status.Devices = []resource.AllocatedDeviceStatus{
+					{
+						Driver: goodName,
+						Pool:   goodName,
+						Device: goodName,
+						Data:   runtime.RawExtension{Raw: []byte(`{"str": "` + strings.Repeat("x", resource.OpaqueParametersMaxLength-9-2+1 /* too large by one */) + `"}`)},
+					},
+				}
+				return claim
+			},
+			deviceStatusFeatureGate: true,
+		},
 		"invalid-device-status-no-device": {
 			wantFailures: field.ErrorList{
 				field.Invalid(field.NewPath("status", "devices").Index(0), structured.MakeDeviceID("b", "a", "r"), "must be an allocated device in the claim"),
@@ -1188,6 +1206,24 @@ func TestValidateClaimStatusUpdate(t *testing.T) {
 			},
 			deviceStatusFeatureGate: false,
 		},
+		"invalid-data-device-status-too-long-feature-gate": {
+			wantFailures: field.ErrorList{
+				field.TooLong(field.NewPath("status", "devices").Index(0).Child("data"), "" /* unused */, resource.OpaqueParametersMaxLength),
+			},
+			oldClaim: func() *resource.ResourceClaim { return validAllocatedClaim }(),
+			update: func(claim *resource.ResourceClaim) *resource.ResourceClaim {
+				claim.Status.Devices = []resource.AllocatedDeviceStatus{
+					{
+						Driver: goodName,
+						Pool:   goodName,
+						Device: goodName,
+						Data:   runtime.RawExtension{Raw: []byte(`{"str": "` + strings.Repeat("x", resource.OpaqueParametersMaxLength-9-2+1 /* too large by one */) + `"}`)},
+					},
+				}
+				return claim
+			},
+			deviceStatusFeatureGate: false,
+		},
 		"invalid-device-status-no-device-disabled-feature-gate": {
 			wantFailures: field.ErrorList{
 				field.Invalid(field.NewPath("status", "devices").Index(0), structured.MakeDeviceID("b", "a", "r"), "must be an allocated device in the claim"),