diff --git a/Misc/NEWS.d/next/Library/2020-10-15-07-33-50.bpo-42036.MonocleAI.rst b/Misc/NEWS.d/next/Library/2020-10-15-07-33-50.bpo-42036.MonocleAI.rst
new file mode 100644
index 00000000000000..5e0d6b90afa053
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2020-10-15-07-33-50.bpo-42036.MonocleAI.rst
@@ -0,0 +1 @@
+Fix unchecked return in Modules/posixmodule.c. The return value of a function that is potentially used to initialize a local variable is not checked. Therefore, reading the local variable may result in an undefined behavior.
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index 6ce0bcb9fe8ca4..84dc1496d8d500 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -8490,7 +8490,12 @@ os_times_impl(PyObject *module)
     FILETIME create, exit, kernel, user;
     HANDLE hProc;
     hProc = GetCurrentProcess();
-    GetProcessTimes(hProc, &create, &exit, &kernel, &user);
+    BOOL ok;
+    ok = GetProcessTimes(hProc, &create, &exit, &kernel, &user);
+    if (!ok) {
+        PyErr_SetFromWindowsErr(0);
+        return -1;
+    }
     /* The fields of a FILETIME structure are the hi and lo part
        of a 64-bit value expressed in 100 nanosecond units.
        1e7 is one second in such units; 1e-7 the inverse.
@@ -15022,7 +15027,10 @@ posixmodule_exec(PyObject *m)
     fd_specified("", -1);
     follow_symlinks_specified("", 1);
     dir_fd_and_follow_symlinks_invalid("chmod", DEFAULT_DIR_FD, 1);
-    dir_fd_converter(Py_None, &ignored);
+    if(!dir_fd_converter(Py_None, &ignored))
+    {
+       return 0;
+    }
     dir_fd_unavailable(Py_None, &ignored);
     }