Linux Kernel vhost Driver VHOST_SET_LOG_FD Kernel Memory resource management

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.8$0-$5k0.00

A vulnerability has been found in Linux Kernel (Operating System) (affected version unknown) and classified as problematic. Affected by this vulnerability is an unknown functionality of the component vhost Driver. The manipulation of the argument VHOST_SET_LOG_FD as part of a IOCTL Command leads to a resource management vulnerability (Kernel Memory). The CWE definition for the vulnerability is CWE-399. As an impact it is known to affect confidentiality. The summary by CVE is:

The vhost_dev_ioctl function in drivers/vhost/vhost.c in the Linux kernel before 4.1.5 allows local users to cause a denial of service (memory consumption) via a VHOST_SET_LOG_FD ioctl call that triggers permanent file-descriptor allocation.

The weakness was presented 08/17/2015 by Michael S. Tsirkin with Red Hat as Bug 1251839 as confirmed bug report (Bugzilla). It is possible to read the advisory at bugzilla.redhat.com. This vulnerability is known as CVE-2015-6252 since 08/17/2015. The exploitation appears to be easy. Attacking locally is a requirement. The successful exploitation needs a single authentication. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 86050 (Debian DSA-3364-1 : linux - security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 169069 (SUSE Enterprise Linux Security Update for the Linux Kernel (SUSE-SU-2016:2074-1)).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. A possible mitigation has been published 2 months after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (105694), Tenable (86050), SecurityFocus (BID 76400†) and Vulnerability Center (SBV-57263†). Additional details are provided at seclists.org.

Productinfo

Type

Vendor

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 4.8

VulDB Base Score: 5.5
VulDB Temp Score: 4.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
unlockunlockunlockunlockunlockunlock
unlockunlockunlockunlockunlockunlock
unlockunlockunlockunlockunlockunlock

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

NVD Base Score: 🔍

Exploitinginfo

Name: Kernel Memory
Class: Resource management / Kernel Memory
CWE: CWE-399 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Local: Yes
Remote: No

Availability: 🔍
Status: Unproven

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Dayunlockunlockunlockunlock
Todayunlockunlockunlockunlock

Nessus ID: 86050
Nessus Name: Debian DSA-3364-1 : linux - security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 703364
OpenVAS Name: Debian Security Advisory DSA 3364-1 (linux - security update)
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: 🔍

Patch: git.kernel.org

Timelineinfo

08/10/2015 🔍
08/17/2015 +7 days 🔍
08/17/2015 +0 days 🔍
08/19/2015 +2 days 🔍
09/21/2015 +33 days 🔍
09/22/2015 +1 days 🔍
10/19/2015 +27 days 🔍
12/01/2015 +43 days 🔍
03/14/2016 +104 days 🔍
06/12/2022 +2281 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: Bug 1251839
Researcher: Michael S. Tsirkin
Organization: Red Hat
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2015-6252 (🔍)
OVAL: 🔍

X-Force: 105694 - Linux Kernel vhost driver information disclosure
SecurityFocus: 76400 - Linux Kernel 'vhost/vhost.c' Local Denial of Service Vulnerability
SecurityTracker: 1033666
Vulnerability Center: 57263 - Linux kernel before 4.1.5 Local DoS via the vhost_dev_ioctl Function, Low

Misc.: 🔍

Entryinfo

Created: 08/19/2015 11:47 AM
Updated: 06/12/2022 03:19 PM
Changes: 08/19/2015 11:47 AM (83), 01/31/2019 01:36 PM (6), 06/12/2022 03:19 PM (3)
Complete: 🔍
Cache ID: 98:67D:40

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Do you know our Splunk app?

Download it now for free!