diff --git a/Lib/selectors.py b/Lib/selectors.py
index edde22c634b..f8b17a14f94 100644
--- a/Lib/selectors.py
+++ b/Lib/selectors.py
@@ -387,7 +387,7 @@ class _PollLikeSelector(_BaseSelectorImpl):
                 selector_events |= self._EVENT_WRITE
             try:
                 self._selector.modify(key.fd, selector_events)
-            except Exception:
+            except:
                 super().unregister(fileobj)
                 raise
             changed = True
@@ -524,7 +524,7 @@ if hasattr(select, 'kqueue'):
                     kev = select.kevent(key.fd, select.KQ_FILTER_WRITE,
                                         select.KQ_EV_ADD)
                     self._selector.control([kev], 0, 0)
-            except Exception:
+            except:
                 super().unregister(fileobj)
                 raise
             return key
diff --git a/Misc/NEWS b/Misc/NEWS
index 20cea471a66..33333260311 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -350,6 +350,10 @@ Extension Modules
 Library
 -------
 
+- bpo-30624: selectors does not take KeyboardInterrupt and SystemExit into
+  account, leaving a fd in a bad state in case of error. Patch by Giampaolo
+  Rodola'.
+
 - bpo-30595: multiprocessing.Queue.get() with a timeout now polls its reader in
   non-blocking mode if it succeeded to aquire the lock but the acquire took
   longer than the timeout.