Linux Foundation xen up to 3.3.2 do_block_io_op input validation

CVSS Meta Temp Score
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CTI Interest Score
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A vulnerability was found in Linux Foundation xen up to 3.3.2 (Virtualization Software). It has been classified as problematic. Affected is the function do_block_io_op. 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. CVE summarizes:

The do_block_io_op function in (1) drivers/xen/blkback/blkback.c and (2) drivers/xen/blktap/blktap.c in Xen before 3.4.0 for the Linux kernel 2.6.18, and possibly other versions, allows guest OS users to cause a denial of service (infinite loop and CPU consumption) via a large production request index to the blkback or blktap back-end drivers. NOTE: some of these details are obtained from third party information.

The weakness was shared 01/10/2011 as Bug 656206 as not defined bug report (Bugzilla). The advisory is shared for download at This vulnerability is traded as CVE-2010-4247. The exploitability is told to be easy. The attack needs to be initiated within the local network. A authentication is needed for exploitation. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 51426 (CentOS 5 : kernel (CESA-2011:0004)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CentOS Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 155552 (Oracle Enterprise Linux Update for Kernel Security, Bug Fix, and Enhancement Update (ELSA-2011-0004)).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Vulnerability Center (SBV-29001) and Tenable (51426). The entries 55571, 55567, 56003 and 55923 are related to this item.






  • open-source

CPE 2.3info

CPE 2.2info


VulDB Meta Base Score: 5.7
VulDB Meta Temp Score: 5.7

VulDB Base Score: 5.7
VulDB Temp Score: 5.7
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Class: Input validation
ATT&CK: Unknown

Local: No
Remote: Partially

Availability: 🔍
Status: Not defined

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Nessus ID: 51426
Nessus Name: CentOS 5 : kernel (CESA-2011:0004)
Nessus File: 🔍
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OpenVAS ID: 880516
OpenVAS Name: CentOS Update for kernel CESA-2011:0004 centos5 i386
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Threat Intelligenceinfo

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Recommended: no mitigation known
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11/16/2010 🔍
11/23/2010 +7 days 🔍
11/23/2010 +0 days 🔍
01/10/2011 +48 days 🔍
01/10/2011 +0 days 🔍
01/10/2011 +0 days 🔍
03/19/2015 +1529 days 🔍
10/11/2021 +2398 days 🔍



Advisory: Bug 656206
Status: Not defined
Confirmation: 🔍

CVE: CVE-2010-4247 (🔍)

Vulnerability Center: 29001 - Xen 3.0 - 3.3.1 \x27kthread_should_stop()\x27 Allows a Guest OS User to Cause a DoS Condition, Medium
SecurityFocus: 45029 - Xen 'drivers/xen/blkback/blkback.c' Local Denial Of Service Vulnerability
Secunia: 35093

See also: 🔍


Created: 03/19/2015 11:27 PM
Updated: 10/11/2021 12:19 PM
Changes: 03/19/2015 11:27 PM (62), 03/13/2017 09:37 AM (11), 10/11/2021 12:12 PM (5), 10/11/2021 12:19 PM (1)
Complete: 🔍


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