CVE-2016-9381

Gentoo Linux Security Advisory 201612-56

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Race condition in QEMU in Xen allows local x86 HVM guest OS administrators to gain privileges by changing certain data on shared rings, aka a "double fetch" vulnerability.

Condición de carrera en QEMU en Xen permite a administradores locales del SO invitado x86 HVM obtener privilegios cambiando ciertos datos en anillos compartidos, vulnerabilidad también conocida como "doble recuperación".

Zhenhao Hong discovered that QEMU incorrectly handled the Virtio GPU device. An attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS and Ubuntu 16.10. Li Qiang discovered that QEMU incorrectly handled the 6300esb watchdog. A privileged attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service. Various other issues were also addressed.

*Credits: N/A

Attack Vector

Local

Attack Complexity

High

Privileges Required

High

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Medium

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2016-11-17 CVE Reserved
2017-01-02 CVE Published
2024-08-06 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CAPEC

References (5)

URL	Tag	Source
http://www.securityfocus.com/bid/94476	Third Party Advisory
http://www.securitytracker.com/id/1037344	Third Party Advisory
http://xenbits.xen.org/xsa/advisory-197.html	Third Party Advisory
https://support.citrix.com/article/CTX218775	Third Party Advisory

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://security.gentoo.org/glsa/201612-56	2020-10-23

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Qemu Search vendor "Qemu"		Qemu Search vendor "Qemu" for product "Qemu"				<= 2.7.1 Search vendor "Qemu" for product "Qemu" and version " <= 2.7.1"		-		Affected
Qemu Search vendor "Qemu"		Qemu Search vendor "Qemu" for product "Qemu"				2.8.0 Search vendor "Qemu" for product "Qemu" and version "2.8.0"		rc0		Affected
Citrix Search vendor "Citrix"		Xenserver Search vendor "Citrix" for product "Xenserver"				6.0.2 Search vendor "Citrix" for product "Xenserver" and version "6.0.2"		-		Affected
Citrix Search vendor "Citrix"		Xenserver Search vendor "Citrix" for product "Xenserver"				6.2.0 Search vendor "Citrix" for product "Xenserver" and version "6.2.0"		-		Affected
Citrix Search vendor "Citrix"		Xenserver Search vendor "Citrix" for product "Xenserver"				6.5 Search vendor "Citrix" for product "Xenserver" and version "6.5"		-		Affected
Citrix Search vendor "Citrix"		Xenserver Search vendor "Citrix" for product "Xenserver"				7.0 Search vendor "Citrix" for product "Xenserver" and version "7.0"		-		Affected