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Fedora Update Notification
FEDORA-2018-0746dac335
2018-03-20 17:27:15.776875
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Name : xen
Product : Fedora 26
Version : 4.8.3
Release : 3.fc26
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:

update Xen page-table isolation (XPTI) mitigation and add 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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