[Oraclevm-errata] New xen updates available via Ksplice (OVMSA-2019-0053)

[Errata Announcements for Oracle VM]

Synopsis: OVMSA-2019-0053 can now be patched using Ksplice
CVEs: CVE-2018-12207

Users with Oracle VM Premier Support can now use Ksplice to patch
against the latest Oracle VM Security Fix Advisory, OVMSA-2019-0053.

INSTALLING THE UPDATES

We recommend that all users of Ksplice on OVM 3.4 install these
updates.

You can install these updates by running:

# ksplice -y xen upgrade

Ksplice Xen patching requires installation of Ksplice-aware packages and the
system must be rebooted after the first installation of these packages.  Refer
to the installation instructions for the Enhanced Ksplice Client in the Ksplice
User's Guide for more details.  Systems may be prepared for Ksplice patching by
installing the Ksplice aware packages in advance, prior to installing the
enhanced Ksplice client.

DESCRIPTION

* XSA-304: CVE-2018-12207: Machine Check Error on page size change.

A hardware bug in Intel x86 processors can result in a Machine Check
Exception when a page table mapping for currently executing instructions
is changed. A privileged user in a guest VM could use this flaw to crash
the host, leading to a denial-of-service.

Orabug: 30522230


SUPPORT

Ksplice support is available at ksplice-support_ww at oracle.com.