Fedora 27: 2018-c553a586c8 Moderate: Xen DoS and Injection Mitigations

This package contains the XenD daemon and xm command line

tools, needed to manage virtual machines running under the

Xen hypervisor

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)

[ 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

su -c 'dnf upgrade xen' at the command line.

For more information, refer to the dnf documentation available at

https://dnf.readthedocs.io/en/latest/command_ref.html

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