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diff --git a/src/VBox/Runtime/testcase/tstRTMemEf.cpp b/src/VBox/Runtime/testcase/tstRTMemEf.cpp
new file mode 100644
index 00000000..e2e9d772
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+++ b/src/VBox/Runtime/testcase/tstRTMemEf.cpp
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+/* $Id: tstRTMemEf.cpp $ */
+/** @file
+ * IPRT - Testcase for the RTMemEf* functions.
+ */
+
+/*
+ * Copyright (C) 2010-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include <iprt/mem.h>
+
+#include <iprt/asm.h>
+#include <iprt/initterm.h>
+#include <iprt/stream.h>
+#include <iprt/string.h>
+
+
+/*********************************************************************************************************************************
+*   Global Variables                                                                                                             *
+*********************************************************************************************************************************/
+static unsigned g_cErrors = 0;
+
+
+static int tstMemAllocEfAccess()
+{
+    /* Trivial alloc fence test - allocate a single word and access both
+     * the word after the allocated block and the word before. One of them
+     * will crash no matter whether the fence is at the bottom or on top. */
+    int32_t *p = (int32_t *)RTMemEfAllocNP(sizeof(int32_t), RTMEM_TAG);
+    RTPrintf("tstRTMemAllocEfAccess: allocated int32_t at %#p\n", p);
+    RTPrintf("tstRTMemAllocEfAccess: triggering buffer overrun...\n");
+    ASMProbeReadByte(p + 1);
+    RTPrintf("tstRTMemAllocEfAccess: triggering buffer underrun...\n");
+    ASMProbeReadByte((char *)p - 1);
+
+    /* Reaching this is a severe error. */
+    return 0;
+}
+
+int main()
+{
+    RTR3InitExeNoArguments(0);
+    RTPrintf("tstRTMemEf: TESTING...\n");
+
+#define CHECK_EXPR(expr) \
+    do { bool const f = !!(expr); if (!f) { RTPrintf("tstRTMemEf(%d): %s!\n", __LINE__, #expr); g_cErrors++; } } while (0)
+
+    /*
+     * Some simple stuff.
+     */
+    {
+        CHECK_EXPR(tstMemAllocEfAccess());
+    }
+
+    /*
+     * Summary.
+     */
+    if (!g_cErrors)
+        RTPrintf("tstMemAutoPtr: SUCCESS\n");
+    else
+        RTPrintf("tstMemAutoPtr: FAILED - %d errors\n", g_cErrors);
+    return !!g_cErrors;
+}