Public bug reported:

[ MICRORELEASE PAGE ]
https://wiki.ubuntu.com/VirtualboxUpdates

[Description]
ATTENTION: PLEASE REFRAIN FROM UPGRADING TO 7.0.16 FOR NOW. THIS RELEASE HAS AN 
ISSUE WHICH MIGHT CAUSE HOST OS CRASH WHEN VM IS CONFIGURED TO USE BRIDGED OR 
HOST-ONLY NETWORKING. WE WILL SEND AN ANNOUNCEMENT TO MAILING LISTS WHEN FIX 
WILL BE AVAILABLE FOR DOWNLOAD. 

An incomplete allocation variable triggers an R0 memory corruption on kernel, 
leading to possible host crashes when high amount of traffic is generated
 
[Fix]
--- a/src/VBox/Devices/Network/SrvIntNetR0.cpp  (revision 162842)
+++ b/src/VBox/Devices/Network/SrvIntNetR0.cpp  (revision 162843)
@@ -2936,5 +2936,5 @@
     union
     {
-        uint8_t     abBuf[sizeof(INTNETSG) + sizeof(INTNETSEG)];
+        uint8_t     abBuf[sizeof(INTNETSG) + 2 * sizeof(INTNETSEG)];
         INTNETSG    SG;
     } u;


[ Regression potential ]
* Low, this is just a variable initialization.

** Affects: virtualbox (Ubuntu)
     Importance: Critical
         Status: New

** Affects: virtualbox-hwe (Ubuntu)
     Importance: Critical
         Status: New

** Description changed:

- .
+ [ MICRORELEASE PAGE ]
+ https://wiki.ubuntu.com/VirtualboxUpdates
+ 
+ [Description]
+ ATTENTION: PLEASE REFRAIN FROM UPGRADING TO 7.0.16 FOR NOW. THIS RELEASE HAS 
AN ISSUE WHICH MIGHT CAUSE HOST OS CRASH WHEN VM IS CONFIGURED TO USE BRIDGED 
OR HOST-ONLY NETWORKING. WE WILL SEND AN ANNOUNCEMENT TO MAILING LISTS WHEN FIX 
WILL BE AVAILABLE FOR DOWNLOAD. 
+ 
+ An incomplete allocation variable triggers an R0 memory corruption on kernel, 
leading to possible host crashes when high amount of traffic is generated
+  
+ [Fix]
+ --- a/src/VBox/Devices/Network/SrvIntNetR0.cpp        (revision 162842)
+ +++ b/src/VBox/Devices/Network/SrvIntNetR0.cpp        (revision 162843)
+ @@ -2936,5 +2936,5 @@
+      union
+      {
+ -        uint8_t     abBuf[sizeof(INTNETSG) + sizeof(INTNETSEG)];
+ +        uint8_t     abBuf[sizeof(INTNETSG) + 2 * sizeof(INTNETSEG)];
+          INTNETSG    SG;
+      } u;
+ 
+ 
+ [ Regression potential ]
+ * Low, this is just a variable initialization.

** Changed in: virtualbox (Ubuntu)
   Importance: Undecided => Critical

** Also affects: virtualbox-hwe (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: virtualbox-hwe (Ubuntu)
   Importance: Undecided => Critical

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https://bugs.launchpad.net/bugs/2063841

Title:
  virtualbox crash on network traffic

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