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This bug was fixed in the package binutils - 2.26.1-1ubuntu1~16.04.7

---------------
binutils (2.26.1-1ubuntu1~16.04.7) xenial; urgency=medium

  * binutils-march-fix.patch: Fix -march= option parsing bound check.
LP: #1781242

 -- Dimitri John Ledkov <xnox@xxxxxxxxxx>  Thu, 30 Aug 2018 14:39:04
+0100

** Changed in: binutils (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1781242

Title:
  as segfault with invalid -march= option

Status in Ubuntu on IBM z Systems:
  Fix Committed
Status in binutils package in Ubuntu:
  Fix Released
Status in binutils source package in Xenial:
  Fix Released

Bug description:
  [Impact]

   * as segfaults, instead of exiting gracefully, when one specifies unsupported arch option (ie. one from future - cause xenial did not support z14)
   * this is bad, as detection fails around supported march options - as if binutils are completely broken, rather than just not supporting this or that CPU level of optimisations.

  [Test Case]

  Bad result:
   $ as -march=foo
  Segmentation fault

  Expected result:
  # as -march=foo
  Assembler messages:
  Error: invalid switch -march=foo
  Error: unrecognized option -march=foo

  [Regression Potential]

   * The result is still a failure condition, but with a proper exit
  code and standard error messages, rather than an unexplainable generic
  segfault.

  [Other Info]
   
   * Original bug report

  The GNU assembler segfaults with an invalid -march= option

  Contact Information = n/a

  ---uname output---
  n/a

  Machine Type = n/a

  ---Debugger---
  A debugger is not configured

  ---Steps to Reproduce---
   $ as -march=foo
  Segmentation fault

  Expected result:
  # as -march=foo
  Assembler messages:
  Error: invalid switch -march=foo
  Error: unrecognized option -march=foo

  Userspace tool common name: as

  The userspace tool has the following bit modes: 64

  Userspace rpm: binutils-2.26.1-1ubuntu1~16.04.6

  Userspace tool obtained from project website:  na

  *Additional Instructions for n/a:
  -Attach ltrace and strace of userspace application.

  The problem is not critical since usually 'as' is invoked through the
  gcc driver which itself errors out for wrong -march= options. It will
  only be a problem if somebody builds a more recent GCC from source and
  uses an -march= option for a machine not supported by the default
  binutils.

  Please consider integrating the attached patch into 16.04 binutils.

  The problem has been fixed in later binutils already. Ubuntu 18.04
  does not appear to be affected.

  --> Package has to set corectly by Canonical

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