diff --git a/tests/conftest.py b/tests/conftest.py
index 16a01f8aa3..5e3a9bd02c 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -53,6 +53,35 @@ def _is_torch_fx_available():
     )
 
 
+# A device-side assert / illegal access poisons the process-wide CUDA context, so
+# every later GPU test errors at setup. Abort the session instead of cascading.
+_CUDA_FATAL_MARKERS = (
+    "device-side assert triggered",
+    "an illegal memory access was encountered",
+    "misaligned address",
+)
+_cuda_context_poisoned = False
+
+
+@pytest.hookimpl(hookwrapper=True)
+def pytest_runtest_makereport(item, call):  # pylint: disable=unused-argument
+    outcome = yield
+    report = outcome.get_result()
+    global _cuda_context_poisoned  # pylint: disable=global-statement
+    if report.failed and call.excinfo is not None:
+        if any(marker in str(call.excinfo.value) for marker in _CUDA_FATAL_MARKERS):
+            _cuda_context_poisoned = True
+
+
+def pytest_runtest_setup(item):
+    if _cuda_context_poisoned:
+        item.session.shouldstop = (
+            "CUDA context corrupted by an earlier test; aborting to avoid "
+            "cascading setup errors. Re-run the job."
+        )
+        pytest.skip("CUDA context corrupted by an earlier test; aborting suite.")
+
+
 def retry_on_request_exceptions(max_retries=3, delay=1):
     def decorator(func):
         @functools.wraps(func)