This failure still can be found on B-hwe 5.0 PowerPC:
https://bugs.launchpad.net/ubuntu-kernel-tests/+bug/1851488

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https://bugs.launchpad.net/bugs/1843327

Title:
  vmlinuz is world-readable

Status in linux-signed package in Ubuntu:
  Fix Released
Status in linux-signed source package in Bionic:
  Fix Released
Status in linux-signed source package in Disco:
  Fix Released

Bug description:
  [Impact]
  ppc64el vmlinuz is world-readable, possibly impacting security on that 
platform.

  [Test case]
  Verify vmlinuz is not world-readable after the fix.

  [Regression potential]
  File permissions may be wrong, possibly allowing attack.

  
  --------------------------------------------------------------------------

    ======================================================================
    FAIL: test_096_boot_symbols_unreadable (__main__.KernelSecurityTest)
    kernel addresses in /boot are not world readable
    ----------------------------------------------------------------------
    Traceback (most recent call last):
      File "./test-kernel-security.py", line 1438, in 
test_096_boot_symbols_unreadable
        self.assertEqual(os.stat(name).st_mode & mask, expected, '%s is world 
readable' % (name))
    AssertionError: /boot/vmlinux-4.15.0-62-generic is world readable
    
    ----------------------------------------------------------------------
    Ran 125 tests in 31.183s
    
    FAILED (failures=1)

  This currently affects ppc64el.

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