diff --git a/simplyblock_core/utils.py b/simplyblock_core/utils.py
index 7cd00d82d..e21d8aad6 100644
--- a/simplyblock_core/utils.py
+++ b/simplyblock_core/utils.py
@@ -871,9 +871,7 @@ def parse_thread_siblings():
             cpu_id = int(cpu[3:])
             try:
                 with open(f"/sys/devices/system/cpu/{cpu}/topology/thread_siblings_list") as f:
-                    siblings[cpu_id] = [
-                        int(x) for x in f.read().strip().split(",")
-                    ]
+                    siblings[cpu_id] = parse_thread_siblings_list(f.read().strip())
             except FileNotFoundError:
                 siblings[cpu_id] = [cpu_id]  # No siblings for this CPU
     return siblings
@@ -890,6 +888,41 @@ def is_hyperthreading_enabled_via_siblings():
     return False
 
 
+def parse_thread_siblings_list(siblings: str) -> list[int]:
+    if not siblings or not siblings.strip():
+        return []
+
+    cpus = set()
+    token_re = re.compile(r"^\s*(?P<start>\d+)(?:\s*-\s*(?P<end>\d+)(?:\s*(?:[:\/])\s*(?P<step>\d+))?)?\s*$", re.X)
+
+    for raw in siblings.split(","):
+        part = raw.strip()
+        if not part:
+            continue
+        m = token_re.match(part)
+        if not m:
+            raise ValueError(f"Invalid token in CPU list: {part!r}")
+
+        start = int(m.group("start"))
+        end = m.group("end")
+        step = m.group("step")
+
+        if end is None:
+            cpus.add(start)
+        else:
+            end = int(end)
+            if start > end:
+                raise ValueError(f"Range start > end in token: {part!r}")
+            step = int(step) if step is not None else 1
+            if step <= 0:
+                raise ValueError(f"Step must be positive in token: {part!r}")
+            for v in range(start, end + 1, step):
+                cpus.add(v)
+
+    return sorted(cpus)
+
+
+
 def load_core_distribution_from_file(file_path, number_of_cores):
     """Load core distribution from the configuration file or use default."""
     # Check if the file exists