diff --git a/pkg/monitor/nvidia/v0/spec.go b/pkg/monitor/nvidia/v0/spec.go
index fde2c9dcd8..240ea429f8 100644
--- a/pkg/monitor/nvidia/v0/spec.go
+++ b/pkg/monitor/nvidia/v0/spec.go
@@ -78,7 +78,7 @@ func (s Spec) DeviceMax() int {
 }
 
 func (s Spec) DeviceNum() int {
-	return int(s.sr.num)
+	return int(min(s.sr.num, uint64(maxDevices)))
 }
 
 // activeProcs returns the process slots currently in use. procnum is read from
diff --git a/pkg/monitor/nvidia/v0/spec_test.go b/pkg/monitor/nvidia/v0/spec_test.go
index 812e8d5c5c..5963e4bf25 100644
--- a/pkg/monitor/nvidia/v0/spec_test.go
+++ b/pkg/monitor/nvidia/v0/spec_test.go
@@ -48,6 +48,8 @@ func TestSpec_DeviceNum(t *testing.T) {
 	tests := []specTest{
 		{name: "device num is 4", spec: &Spec{sr: &sharedRegionT{num: 4}}, expected: 4},
 		{name: "device num is 8", spec: &Spec{sr: &sharedRegionT{num: 8}}, expected: 8},
+		{name: "num larger than maxDevices is clamped", spec: &Spec{sr: &sharedRegionT{num: 9999}}, expected: maxDevices},
+		{name: "high-bit uint64 num is clamped not negative", spec: &Spec{sr: &sharedRegionT{num: 0x8000000000000001}}, expected: maxDevices},
 	}
 
 	for _, tt := range tests {
diff --git a/pkg/monitor/nvidia/v1/spec.go b/pkg/monitor/nvidia/v1/spec.go
index a0e214bbdc..e8d71325f8 100644
--- a/pkg/monitor/nvidia/v1/spec.go
+++ b/pkg/monitor/nvidia/v1/spec.go
@@ -92,7 +92,7 @@ func (s Spec) DeviceMax() int {
 }
 
 func (s Spec) DeviceNum() int {
-	return int(s.sr.num)
+	return int(min(s.sr.num, uint64(maxDevices)))
 }
 
 // activeProcs returns the process slots currently in use. procnum is read from
diff --git a/pkg/monitor/nvidia/v1/spec_test.go b/pkg/monitor/nvidia/v1/spec_test.go
index 9761a840c7..525b02616e 100644
--- a/pkg/monitor/nvidia/v1/spec_test.go
+++ b/pkg/monitor/nvidia/v1/spec_test.go
@@ -134,6 +134,24 @@ func Test_DeviceNum(t *testing.T) {
 			},
 			want: int(4),
 		},
+		{
+			name: "num larger than maxDevices is clamped",
+			args: &Spec{
+				sr: &sharedRegionT{
+					num: 9999,
+				},
+			},
+			want: maxDevices,
+		},
+		{
+			name: "high-bit uint64 num is clamped not negative",
+			args: &Spec{
+				sr: &sharedRegionT{
+					num: 0x8000000000000001,
+				},
+			},
+			want: maxDevices,
+		},
 	}
 	for _, test := range tests {
 		t.Run(test.name, func(t *testing.T) {