Index: VirtualBox-7.0.10/src/VBox/Additions/linux/drm/vbox_fb.c
===================================================================
--- VirtualBox-7.0.10.orig/src/VBox/Additions/linux/drm/vbox_fb.c
+++ VirtualBox-7.0.10/src/VBox/Additions/linux/drm/vbox_fb.c
@@ -197,9 +197,13 @@ static struct fb_ops vboxfb_ops = {
 	.owner = THIS_MODULE,
 	.fb_check_var = drm_fb_helper_check_var,
 	.fb_set_par = drm_fb_helper_set_par,
+#if RTLNX_VER_MIN(6, 5, 0)
+	FB_DEFAULT_SYS_OPS,
+#else
 	.fb_fillrect = drm_fb_helper_sys_fillrect,
 	.fb_copyarea = drm_fb_helper_sys_copyarea,
 	.fb_imageblit = drm_fb_helper_sys_imageblit,
+#endif
 	.fb_pan_display = drm_fb_helper_pan_display,
 	.fb_blank = drm_fb_helper_blank,
 	.fb_setcmap = drm_fb_helper_setcmap,
Index: VirtualBox-7.0.10/include/iprt/cdefs.h
===================================================================
--- VirtualBox-7.0.10.orig/include/iprt/cdefs.h
+++ VirtualBox-7.0.10/include/iprt/cdefs.h
@@ -38,8 +38,9 @@
 #ifndef RT_WITHOUT_PRAGMA_ONCE
 # pragma once
 #endif
-
-
+#if defined(DECLARE_FLEX_ARRAY)
+# include <linux/version.h>
+#endif
 /** @defgroup grp_rt_cdefs  IPRT Common Definitions and Macros
  * @{
  */
@@ -2961,6 +2962,12 @@
  * @note    GCC does not permit using this in nested structures, where as MSC
  *          does.  So, use RT_FLEXIBLE_ARRAY_NESTED for that.
  *
+ * @note    Linux kernels 6.5+ enforce field-spanning write operations
+ *          and require flexible arrays to end with 'array[]' rather than array[1].
+ *          This construct fails with unions, but VB does not have any such unions.
+ *          This header is used with both kernel- and user-mode code. In user-mode,
+ *          the old method works. If DECLARE_FLEX_ARRAY is defined, we are
+ *          building kernel-mode code and RT_FLEXIBLE_ARRAY is set to blank.
  * @sa      RT_FLEXIBLE_ARRAY_NESTED, RT_FLEXIBLE_ARRAY_IN_UNION
  */
 #if RT_MSC_PREREQ(RT_MSC_VER_VS2005) /** @todo Probably much much earlier. */ \
@@ -2976,10 +2983,18 @@
 # if __STDC_VERSION__ >= 1999901L
 #  define RT_FLEXIBLE_ARRAY
 # else
-#  define RT_FLEXIBLE_ARRAY                     1
+#  if defined(DECLARE_FLEX_ARRAY)
+#    define RT_FLEXIBLE_ARRAY
+#  else
+#    define RT_FLEXIBLE_ARRAY                     1
+#  endif
 # endif
 #else
+# if defined(DECLARE_FLEX_ARRAY)
+#  define RT_FLEXIBLE_ARRAY
+# else
 # define RT_FLEXIBLE_ARRAY                      1
+# endif
 #endif
 
 /** @def RT_FLEXIBLE_ARRAY_EXTENSION
@@ -3008,7 +3023,9 @@
 #ifdef _MSC_VER
 # define RT_FLEXIBLE_ARRAY_NESTED               RT_FLEXIBLE_ARRAY
 #else
+# if !defined(DECLARE_FLEX_ARRAY)
 # define RT_FLEXIBLE_ARRAY_NESTED               1
+# endif
 #endif
 
 /** @def RT_FLEXIBLE_ARRAY_IN_UNION
@@ -3024,7 +3041,9 @@
 #ifdef _MSC_VER
 # define RT_FLEXIBLE_ARRAY_IN_UNION             RT_FLEXIBLE_ARRAY
 #else
-# define RT_FLEXIBLE_ARRAY_IN_UNION             1
+# if !defined(DECLARE_FLEX_ARRAY)
+#  define RT_FLEXIBLE_ARRAY_IN_UNION             1
+# endif
 #endif
 
 /** @def RT_FLEXIBLE_ARRAY_IN_NESTED_UNION
@@ -3037,7 +3056,9 @@
 #ifdef _MSC_VER
 # define RT_FLEXIBLE_ARRAY_IN_NESTED_UNION      RT_FLEXIBLE_ARRAY_NESTED
 #else
-# define RT_FLEXIBLE_ARRAY_IN_NESTED_UNION      1
+# if !defined(DECLARE_FLEX_ARRAY)
+#  define RT_FLEXIBLE_ARRAY_IN_NESTED_UNION      1
+# endif
 #endif
 
 /** @def RT_UNION_NM
Index: VirtualBox-7.0.10/include/VBox/VBoxGuest.h
===================================================================
--- VirtualBox-7.0.10.orig/include/VBox/VBoxGuest.h
+++ VirtualBox-7.0.10/include/VBox/VBoxGuest.h
@@ -458,8 +458,12 @@ typedef struct VBGLIOCLOG
         {
             /** The log message.
              * The length is determined from the input size and zero termination. */
-            char                    szMsg[RT_FLEXIBLE_ARRAY_IN_NESTED_UNION];
-        } In;
+#if defined(DECLARE_FLEX_ARRAY)
+		DECLARE_FLEX_ARRAY(char, szMsg);
+#else	
+		char                    szMsg[RT_FLEXIBLE_ARRAY_IN_NESTED_UNION];
+#endif
+     	} In;
     } u;
 } VBGLIOCLOG, RT_FAR *PVBGLIOCLOG;
 /** @} */