CVE-2016-9386

Publication date 23 January 2017

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

The x86 emulator in Xen does not properly treat x86 NULL segments as unusable when accessing memory, which might allow local HVM guest users to gain privileges via vectors involving "unexpected" base/limit values.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
xen	17.04 zesty	Fixed 4.8.0-1ubuntu1
	16.10 yakkety	Fixed 4.7.0-0ubuntu2.1
	16.04 LTS xenial	Fixed 4.6.0-1ubuntu4.3
	14.04 LTS trusty	Fixed 4.4.2-0ubuntu0.14.04.9
	12.04 LTS precise	Fixed 4.1.6.1-0ubuntu0.12.04.13

How can I get the fixes?
What do statuses mean?

Notes

mdeslaur

This is XSA-191

Severity score breakdown

Parameter	Value
Base score	7.8 · High
Attack vector	Local
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

MITRE
NVD
Launchpad
Debian

Other references

https://xenbits.xen.org/xsa/advisory-191.html
https://www.cve.org/CVERecord?id=CVE-2016-9386