What is the severity of CVE-2016-7777?

CVE-2016-7777 is considered a high severity vulnerability due to its potential for local users to manipulate critical register states.

How do I fix CVE-2016-7777?

To fix CVE-2016-7777, upgrade to Xen version 4.8.0 or later where the vulnerability has been addressed.

Who is affected by CVE-2016-7777?

Any local x86 HVM guest OS user on Xen versions 4.7.x and earlier is affected by CVE-2016-7777.

Is CVE-2016-7777 a remote exploit?

No, CVE-2016-7777 is a local exploit, meaning an attacker needs access to the guest OS to exploit this vulnerability.

Vulnerability/
CVE-2016-7777

medium

6.3

CWE

362

7/10/2016

6/8/2024

CVE-2016-7777: Race Condition

Q: What kind of attack does CVE-2016-7777 allow?

CVE-2016-7777 allows local users to read or modify FPU, MMX, or XMM register state information of arbitrary tasks.

First published: Fri Oct 07 2016(Updated: )

Xen 4.7.x and earlier does not properly honor CR0.TS and CR0.EM, which allows local x86 HVM guest OS users to read or modify FPU, MMX, or XMM register state information belonging to arbitrary tasks on the guest by modifying an instruction while the hypervisor is preparing to emulate it.

Credit: cve@mitre.org

Affected Software	Affected Version	How to fix
Xen xen-unstable	<=4.7.0

Remedy

http://xenbits.xen.org/xsa/advisory-190.html

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Reference Links

Frequently Asked Questions

What is the severity of CVE-2016-7777?
CVE-2016-7777 is considered a high severity vulnerability due to its potential for local users to manipulate critical register states.
How do I fix CVE-2016-7777?
To fix CVE-2016-7777, upgrade to Xen version 4.8.0 or later where the vulnerability has been addressed.
Who is affected by CVE-2016-7777?
Any local x86 HVM guest OS user on Xen versions 4.7.x and earlier is affected by CVE-2016-7777.
What kind of attack does CVE-2016-7777 allow?
CVE-2016-7777 allows local users to read or modify FPU, MMX, or XMM register state information of arbitrary tasks.
Is CVE-2016-7777 a remote exploit?
No, CVE-2016-7777 is a local exploit, meaning an attacker needs access to the guest OS to exploit this vulnerability.

agent/type
agent/softwarecombine
collector/mitre-cve
source/MITRE
agent/author
agent/references
agent/last-modified-date
agent/severity
agent/weakness
agent/remedy
agent/event
agent/description
agent/first-publish-date
agent/source
agent/tags
collector/nvd-index
agent/software-canonical-lookup-request
vendor/xen
canonical/xen xen-unstable
version/xen xen-unstable/4.7.0

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Frequently Asked Questions

What is the severity of CVE-2016-7777?
CVE-2016-7777 is considered a high severity vulnerability due to its potential for local users to manipulate critical register states.
How do I fix CVE-2016-7777?
To fix CVE-2016-7777, upgrade to Xen version 4.8.0 or later where the vulnerability has been addressed.
Who is affected by CVE-2016-7777?
Any local x86 HVM guest OS user on Xen versions 4.7.x and earlier is affected by CVE-2016-7777.
What kind of attack does CVE-2016-7777 allow?
CVE-2016-7777 allows local users to read or modify FPU, MMX, or XMM register state information of arbitrary tasks.
Is CVE-2016-7777 a remote exploit?
No, CVE-2016-7777 is a local exploit, meaning an attacker needs access to the guest OS to exploit this vulnerability.