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Fedora Update Notification
FEDORA-2018-c553a586c8
2018-03-06 17:17:51.858344
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Name        : xen
Product     : Fedora 27
Version     : 4.9.1
Release     : 5.fc27
URL         : http://xen.org/
Summary     : Xen is a virtual machine monitor
Description :
This package contains the XenD daemon and xm command line
tools, needed to manage virtual machines running under the
Xen hypervisor

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Update Information:

add Xen page-table isolation (XPTI) mitigation and Branch Target Injection (BTI)
mitigation for XSA-254 DoS via non-preemptable L3/L4 pagetable freeing [XSA-252]
(#1549568) grant table v2 -> v1 transition may crash Xen [XSA-255] (#1549570)
x86 PVH guest without LAPIC may DoS the host [XSA-256] (#1549572)
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References:

  [ 1 ] Bug #1544456 - CVE-2018-7540 xsa252 xen: DoS via non-preemptable L3/L4 
pagetable freeing (XSA-252)
        https://bugzilla.redhat.com/show_bug.cgi?id=1544456
  [ 2 ] Bug #1544459 - CVE-2018-7541 xsa255 xen: grant table v2 -> v1 
transition may crash Xen (XSA-255)
        https://bugzilla.redhat.com/show_bug.cgi?id=1544459
  [ 3 ] Bug #1544453 - CVE-2018-7542 xsa256 xen: x86 PVH guest without LAPIC 
may DoS the host (XSA-256)
        https://bugzilla.redhat.com/show_bug.cgi?id=1544453
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This update can be installed with the "dnf" update program. Use
su -c 'dnf upgrade xen' at the command line.
For more information, refer to the dnf documentation available at
http://dnf.readthedocs.io/en/latest/command_ref.html#upgrade-command-label

All packages are signed with the Fedora Project GPG key. More details on the
GPG keys used by the Fedora Project can be found at
https://fedoraproject.org/keys
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