diff --git a/Misc/NEWS b/Misc/NEWS
index bf7b8f10ffe..7311a657f6f 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -10,6 +10,10 @@ What's New in Python 3.6.0 alpha 3
 Library
 -------
 
+- Issue #27278: Fix os.urandom() implementation using getrandom() on Linux.
+  Truncate size to INT_MAX and loop until we collected enough random bytes,
+  instead of casting a directly Py_ssize_t to int.
+
 - Issue #16864: sqlite3.Cursor.lastrowid now supports REPLACE statement.
   Initial patch by Alex LordThorsen.
 
diff --git a/Python/random.c b/Python/random.c
index e4f1e7a48bb..cbdebbead3c 100644
--- a/Python/random.c
+++ b/Python/random.c
@@ -146,7 +146,7 @@ py_getrandom(void *buffer, Py_ssize_t size, int raise)
            to 1024 bytes */
         n = Py_MIN(size, 1024);
 #else
-        n = size;
+        n = Py_MIN(size, INT_MAX);
 #endif
 
         errno = 0;