Xen up to 4.8.x Interrupt Maskin input validation

CVSS Meta Temp Score
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CTI Interest Score
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6.1$0-$5k0.00

Summaryinfo

A vulnerability has been found in Xen 4.4.x/4.5.x/4.6.x/4.7.x/4.8.x and classified as critical. The impacted element is an unknown function of the component Interrupt Maskin. Performing a manipulation results in input validation. This vulnerability is cataloged as CVE-2016-10024. It is possible to initiate the attack remotely. There is no exploit available. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability, which was classified as critical, was found in Xen 4.4.x/4.5.x/4.6.x/4.7.x/4.8.x (Virtualization Software). This affects an unknown part of the component Interrupt Maskin. The manipulation with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on availability. The summary by CVE is:

Xen through 4.8.x allows local x86 PV guest OS kernel administrators to cause a denial of service (host hang or crash) by modifying the instruction stream asynchronously while performing certain kernel operations.

The bug was discovered 12/21/2016. The weakness was shared 12/21/2016 by Jan Beulich as XSA-202 as confirmed security advisory (Website). The advisory is shared at xenbits.xen.org. The vendor cooperated in the coordination of the public release. This vulnerability is uniquely identified as CVE-2016-10024 since 12/21/2016. The exploitability is told to be easy. An attack has to be approached locally. A authentication is necessary for exploitation. Neither technical details nor an exploit are publicly available. The advisory points out:

Certain PV guest kernel operations (page table writes in particular) need emulation, and use Xen's general x86 instruction emulator. This allows a malicious guest kernel which asynchronously modifies its instruction stream to effect the clearing of EFLAGS.IF from the state used to return to guest context.

The vulnerability scanner Nessus provides a plugin with the ID 96522 (OracleVM 3.2 : xen (OVMSA-2017-0009)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family OracleVM Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 169446 (SUSE Enterprise Linux Security Update for xen (SUSE-SU-2016:3207-1)).

Applying a patch is able to eliminate this problem. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (96522), SecurityFocus (BID 95021†) and SecurityTracker (ID 1037517†). The entries VDB-94503 and VDB-94615 are related to this item. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.1

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.0
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 96522
Nessus Name: OracleVM 3.2 : xen (OVMSA-2017-0009)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 870220
OpenVAS Name: Fedora Update for xen FEDORA-2016-92e3ea2d1b
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Timelineinfo

12/21/2016 🔍
12/21/2016 +0 days 🔍
12/21/2016 +0 days 🔍
12/21/2016 +0 days 🔍
12/21/2016 +0 days 🔍
12/21/2016 +0 days 🔍
12/22/2016 +1 days 🔍
01/16/2017 +25 days 🔍
01/26/2017 +10 days 🔍
05/14/2026 +3395 days 🔍

Sourcesinfo

Advisory: XSA-202
Researcher: Jan Beulich
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2016-10024 (🔍)
GCVE (CVE): GCVE-0-2016-10024
GCVE (VulDB): GCVE-100-94629

OVAL: 🔍

SecurityFocus: 95021 - Xen CVE-2016-10024 Denial of Service Vulnerability
SecurityTracker: 1037517

See also: 🔍

Entryinfo

Created: 12/22/2016 11:14
Updated: 05/14/2026 22:27
Changes: 12/22/2016 11:14 (83), 07/30/2019 18:51 (5), 05/14/2026 22:27 (18)
Complete: 🔍
Cache ID: 216::103

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