Fedora 26 : xen (2018-0746dac335)

high Nessus Plugin ID 108492

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Synopsis

The remote Fedora host is missing a security update.

Description

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)

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-2018-0746dac335

Plugin Details

Severity: High

ID: 108492

File Name: fedora_2018-0746dac335.nasl

Version: 1.4

Type: local

Agent: unix

Published: 3/21/2018

Updated: 1/6/2021

Dependencies: ssh_get_info.nasl

Risk Information

VPR

Risk Factor: Medium

Score: 6.5

CVSS v2

Risk Factor: Medium

Base Score: 6.1

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

CVSS v3

Risk Factor: High

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:26

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

Patch Publication Date: 3/20/2018

Vulnerability Publication Date: 2/27/2018

Reference Information

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