Fedora 27 : xen (2018-c553a586c8)

Medium Nessus Plugin ID 107176

Synopsis

The remote Fedora host is missing a security update.

Description

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)

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

Update the affected xen package.

See Also

https://bodhi.fedoraproject.org/updates/FEDORA-2018-c553a586c8

Plugin Details

Severity: Medium

ID: 107176

File Name: fedora_2018-c553a586c8.nasl

Version: 1.2

Type: local

Agent: unix

Published: 2018/03/07

Modified: 2018/03/19

Dependencies: 12634

Risk Information

Risk Factor: Medium

CVSSv2

Base Score: 6.1

Vector: CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:C

CVSSv3

Base Score: 8.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Vulnerability Information

CPE: p-cpe:/a:fedoraproject:fedora:xen, cpe:/o:fedoraproject:fedora:27

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list

Patch Publication Date: 2018/03/06

Reference Information

CVE: CVE-2018-7540, CVE-2018-7541, CVE-2018-7542