The SNMP NAT helper netfilter can cause a memory corruption. The corruption can
be triggered remotely when the ip_nat_snmp_basic module is loaded and traffic on
port 161 or 162 is NATed.
Proposed upstream fix can be found here:
Downgrading impact to moderate due to "unlikely configuration".
committed in stream E5 build 42.0.1
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.
committed in stream U5 build 42.4. A test kernel with this patch is available