diff -Nru virtualbox-4.3.18-dfsg/debian/changelog virtualbox-4.3.18-dfsg/debian/changelog
--- virtualbox-4.3.18-dfsg/debian/changelog	2015-01-28 03:39:21.000000000 +0100
+++ virtualbox-4.3.18-dfsg/debian/changelog	2015-03-23 10:13:14.000000000 +0100
@@ -1,3 +1,10 @@
+virtualbox (4.3.18-dfsg-2ubuntu2) utopic; urgency=medium
+
+  * d/p/37-fix-virtualbox-hang.patch: fix virtualbox hang
+    with kernel >= 3.7 (LP: #1435113)
+
+ -- Gianfranco Costamagna <costamagnagianfranco@yahoo.it>  Mon, 23 Mar 2015 10:12:42 +0100
+
 virtualbox (4.3.18-dfsg-2ubuntu1) utopic-security; urgency=medium
 
   * SECURITY UPDATE: multiple flaws in experimental video code (LP: #1413603)
diff -Nru virtualbox-4.3.18-dfsg/debian/patches/37-fix-virtualbox-hang.patch virtualbox-4.3.18-dfsg/debian/patches/37-fix-virtualbox-hang.patch
--- virtualbox-4.3.18-dfsg/debian/patches/37-fix-virtualbox-hang.patch	1970-01-01 01:00:00.000000000 +0100
+++ virtualbox-4.3.18-dfsg/debian/patches/37-fix-virtualbox-hang.patch	2015-03-23 10:11:31.000000000 +0100
@@ -0,0 +1,54 @@
+diff --git a/src/VBox/HostDrivers/Support/linux/SUPDrv-linux.c b/src/VBox/HostDrivers/Support/linux/SUPDrv-linux.c
+index 4ef40f9..6696d11 100644
+--- a/src/VBox/HostDrivers/Support/linux/SUPDrv-linux.c
++++ b/src/VBox/HostDrivers/Support/linux/SUPDrv-linux.c
+@@ -48,6 +48,12 @@
+ # include <iprt/power.h>
+ # define VBOX_WITH_SUSPEND_NOTIFICATION
+ #endif
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 7, 0)
++# include <asm/smap.h>
++#else
++static inline void clac(void) { }
++static inline void stac(void) { }
++#endif
+ 
+ #include <linux/sched.h>
+ #ifdef CONFIG_DEVFS_FS
+@@ -622,6 +628,7 @@ static int VBoxDrvLinuxIOCtl(struct inode *pInode, struct file *pFilp, unsigned
+ #endif
+ {
+     PSUPDRVSESSION pSession = (PSUPDRVSESSION)pFilp->private_data;
++    int rc;
+ 
+     /*
+      * Deal with the two high-speed IOCtl that takes it's arguments from
+@@ -632,12 +639,15 @@ static int VBoxDrvLinuxIOCtl(struct inode *pInode, struct file *pFilp, unsigned
+                       || uCmd == SUP_IOCTL_FAST_DO_HM_RUN
+                       || uCmd == SUP_IOCTL_FAST_DO_NOP)
+                   && pSession->fUnrestricted == true))
+-        return supdrvIOCtlFast(uCmd, ulArg, &g_DevExt, pSession);
++    {
++        stac();
++        rc = supdrvIOCtlFast(uCmd, ulArg, &g_DevExt, pSession);
++        clac();
++        return rc;
++    }
+     return VBoxDrvLinuxIOCtlSlow(pFilp, uCmd, ulArg, pSession);
+ 
+ #else   /* !HAVE_UNLOCKED_IOCTL */
+-
+-    int rc;
+     unlock_kernel();
+     if (RT_LIKELY(   (   uCmd == SUP_IOCTL_FAST_DO_RAW_RUN
+                       || uCmd == SUP_IOCTL_FAST_DO_HM_RUN
+@@ -715,7 +725,9 @@ static int VBoxDrvLinuxIOCtlSlow(struct file *pFilp, unsigned int uCmd, unsigned
+     /*
+      * Process the IOCtl.
+      */
++    stac();
+     rc = supdrvIOCtl(uCmd, &g_DevExt, pSession, pHdr, cbBuf);
++    clac();
+ 
+     /*
+      * Copy ioctl data and output buffer back to user space.
diff -Nru virtualbox-4.3.18-dfsg/debian/patches/series virtualbox-4.3.18-dfsg/debian/patches/series
--- virtualbox-4.3.18-dfsg/debian/patches/series	2014-10-18 12:17:45.000000000 +0200
+++ virtualbox-4.3.18-dfsg/debian/patches/series	2015-03-23 10:12:21.000000000 +0100
@@ -14,3 +14,4 @@
 32-disable-guest-version-check.patch
 35-libvdeplug-soname.patch
 36-fix-vnc-version-string.patch
+37-fix-virtualbox-hang.patch