CVE-2018-15746 Qemu: seccomp: blacklist is not applied to all threads

[P J P <ppandit () redhat com>]

  Hello,

An issue was found in the way QEMU implements Seccomp sandboxing. In that, all 
QEMU threads are not bound by the sandbox. A guest user/process maybe be able 
to use this flaw to crash a guest resulting in DoS.

Upstream patch:
---------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2018-08/msg04892.html

Reference:
----------
  -> https://lists.gnu.org/archive/html/qemu-devel/2018-08/msg02289.html

'CVE-2018-15746' assigned via -> https://cveform.mitre.org/

Thank you.
--
Prasad J Pandit / Red Hat Product Security Team
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