diff --git a/pkg/monitortests/clusterversionoperator/legacycvomonitortests/operators.go b/pkg/monitortests/clusterversionoperator/legacycvomonitortests/operators.go
index 3af608055c79..0946da9456d7 100644
--- a/pkg/monitortests/clusterversionoperator/legacycvomonitortests/operators.go
+++ b/pkg/monitortests/clusterversionoperator/legacycvomonitortests/operators.go
@@ -47,8 +47,37 @@ func checkAuthenticationAvailableExceptions(condition *configv1.ClusterOperatorS
 	return false
 }
 
+// noExecuteTaintManagerAvailableGrace covers brief Available blips that land just after
+// NoExecuteTaintManager removes its taint while Deployments are still rescheduling
+// (observed packageserver recovery ~3s after test end).
+const noExecuteTaintManagerAvailableGrace = time.Minute
+
+func noExecuteTaintManagerTestIntervals(events monitorapi.Intervals) monitorapi.Intervals {
+	return events.Filter(func(eventInterval monitorapi.Interval) bool {
+		return eventInterval.Source == monitorapi.SourceE2ETest &&
+			strings.Contains(eventInterval.Locator.Keys[monitorapi.LocatorE2ETestKey], "NoExecuteTaintManager")
+	})
+}
+
+// overlapsNoExecuteTaintManagerTest reports whether conditionInterval overlaps a
+// NoExecuteTaintManager e2e window, including grace after the test ends.
+func overlapsNoExecuteTaintManagerTest(conditionInterval monitorapi.Interval, taintTests monitorapi.Intervals, grace time.Duration) bool {
+	for _, test := range taintTests {
+		window := test
+		if !window.To.IsZero() {
+			window.To = window.To.Add(grace)
+		}
+		if utility.IntervalsOverlap(conditionInterval, window) {
+			return true
+		}
+	}
+	return false
+}
+
 func testStableSystemOperatorStateTransitions(events monitorapi.Intervals, topology configv1.TopologyMode) []*junitapi.JUnitTestCase {
-	except := func(operator string, condition *configv1.ClusterOperatorStatusCondition, _ monitorapi.Interval) string {
+	isTwoNodeDualReplica := topology == configv1.DualReplicaTopologyMode
+	taintTests := noExecuteTaintManagerTestIntervals(events)
+	except := func(operator string, condition *configv1.ClusterOperatorStatusCondition, eventInterval monitorapi.Interval) string {
 		if condition.Status == configv1.ConditionTrue {
 			if condition.Type == configv1.OperatorAvailable {
 				return fmt.Sprintf("%s=%s is the happy case", condition.Type, condition.Status)
@@ -86,6 +115,22 @@ func testStableSystemOperatorStateTransitions(events monitorapi.Intervals, topol
 			if operator == "ingress" && condition.Reason == "IngressUnavailable" {
 				return "https://issues.redhat.com/browse/OCPBUGS-92835"
 			}
+			// DualReplica / TNF: serial NoExecuteTaintManager tests NoExecute-taint a control-plane
+			// node (masters are also workers), so Deployments briefly cannot schedule. Require the
+			// blip to overlap a NoExecuteTaintManager window (+grace) so unrelated Available=False
+			// regressions are not allowlisted for the whole DualReplica job.
+			if isTwoNodeDualReplica && overlapsNoExecuteTaintManagerTest(eventInterval, taintTests, noExecuteTaintManagerAvailableGrace) {
+				switch operator {
+				case "csi-snapshot-controller":
+					if strings.Contains(condition.Message, `Waiting for Deployment`) {
+						return "csi-snapshot-controller may report Available=False while Waiting for Deployment during DualReplica NoExecuteTaintManager tests"
+					}
+				case "operator-lifecycle-manager-packageserver":
+					if condition.Reason == "ClusterServiceVersionNotSucceeded" {
+						return "https://issues.redhat.com/browse/OCPBUGS-23744"
+					}
+				}
+			}
 			return ""
 		}
 		if condition.Type == configv1.OperatorDegraded && condition.Status == configv1.ConditionTrue {
diff --git a/pkg/monitortests/clusterversionoperator/legacycvomonitortests/operators_test.go b/pkg/monitortests/clusterversionoperator/legacycvomonitortests/operators_test.go
index ecdb11142232..0c135acd1232 100644
--- a/pkg/monitortests/clusterversionoperator/legacycvomonitortests/operators_test.go
+++ b/pkg/monitortests/clusterversionoperator/legacycvomonitortests/operators_test.go
@@ -490,3 +490,77 @@ func TestIsTNFJobClusterOperatorReason(t *testing.T) {
 		})
 	}
 }
+
+func TestOverlapsNoExecuteTaintManagerTest(t *testing.T) {
+	base := time.Date(2026, 8, 10, 13, 55, 43, 0, time.UTC)
+	taintTest := monitorapi.Interval{
+		Condition: monitorapi.Condition{
+			Locator: monitorapi.Locator{
+				Keys: map[monitorapi.LocatorKey]string{
+					monitorapi.LocatorE2ETestKey: "[sig-node] NoExecuteTaintManager Single Pod [Serial] eventually evict pod with finite tolerations from tainted nodes",
+				},
+			},
+		},
+		Source: monitorapi.SourceE2ETest,
+		From:   base,
+		To:     base.Add(2 * time.Minute), // ends 13:57:55
+	}
+	otherTest := monitorapi.Interval{
+		Condition: monitorapi.Condition{
+			Locator: monitorapi.Locator{
+				Keys: map[monitorapi.LocatorKey]string{
+					monitorapi.LocatorE2ETestKey: "[sig-api-machinery] Namespaces [Serial] should ensure that all pods are removed when a namespace is deleted",
+				},
+			},
+		},
+		Source: monitorapi.SourceE2ETest,
+		From:   base.Add(2 * time.Minute),
+		To:     base.Add(3 * time.Minute),
+	}
+	taintTests := noExecuteTaintManagerTestIntervals(monitorapi.Intervals{taintTest, otherTest})
+	assert.Len(t, taintTests, 1)
+
+	tests := []struct {
+		name string
+		from time.Time
+		to   time.Time
+		want bool
+	}{
+		{
+			name: "during test",
+			from: base.Add(30 * time.Second),
+			to:   base.Add(45 * time.Second),
+			want: true,
+		},
+		{
+			name: "few seconds after test within grace",
+			from: base.Add(2*time.Minute + 3*time.Second),
+			to:   base.Add(2*time.Minute + 3*time.Second + 81*time.Millisecond),
+			want: true,
+		},
+		{
+			name: "just inside grace window",
+			from: base.Add(2*time.Minute + 59*time.Second),
+			to:   base.Add(3 * time.Minute),
+			want: true,
+		},
+		{
+			name: "after grace window",
+			from: base.Add(3*time.Minute + time.Second),
+			to:   base.Add(3*time.Minute + 2*time.Second),
+			want: false,
+		},
+		{
+			name: "before test",
+			from: base.Add(-2 * time.Minute),
+			to:   base.Add(-time.Minute),
+			want: false,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			condition := monitorapi.Interval{From: tt.from, To: tt.to}
+			assert.Equal(t, tt.want, overlapsNoExecuteTaintManagerTest(condition, taintTests, noExecuteTaintManagerAvailableGrace))
+		})
+	}
+}