Linux Foundation Xen up to 4.0.1 handle_gdt_ldt_mapping_fault denial of service

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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A vulnerability classified as critical was found in Linux Foundation Xen (Virtualization Software). This vulnerability affects the function handle_gdt_ldt_mapping_fault. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. CVE summarizes:

The fixup_page_fault function in arch/x86/traps.c in Xen 4.0.1 and earlier on 64-bit platforms, when paravirtualization is enabled, does not verify that kernel mode is used to call the handle_gdt_ldt_mapping_fault function, which allows guest OS users to cause a denial of service (host OS BUG_ON) via a crafted memory access.

The weakness was shared 01/24/2011 as Bug 658155 as not defined bug report (Bugzilla). The advisory is shared for download at This vulnerability was named CVE-2010-4255. The exploitation appears to be easy. The attack needs to approached within the local network. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 10/13/2021).

The vulnerability scanner Nessus provides a plugin with the ID 51522 (RHEL 5 : kernel (RHSA-2011:0017)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Red Hat Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 118912 (Red Hat Update for Kernel (RHSA-2011:0017)).

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 vulnerability database at Tenable (51522).







CPE 2.3info

CPE 2.2info


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VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.5

VulDB Base Score: 6.5
VulDB Temp Score: 6.5
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Class: Denial of service
CWE: CWE-404

Local: No
Remote: Partially

Availability: 🔍
Status: Not defined

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Nessus ID: 51522
Nessus Name: RHEL 5 : kernel (RHSA-2011:0017)
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OpenVAS ID: 870378
OpenVAS Name: RedHat Update for Red Hat Enterprise Linux 5.6 kernel RHSA-2011:0017-01
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Threat Intelligenceinfo

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Recommended: no mitigation known
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0-Day Time: 🔍


11/16/2010 🔍
11/30/2010 +14 days 🔍
11/30/2010 +0 days 🔍
01/18/2011 +49 days 🔍
01/24/2011 +6 days 🔍
01/24/2011 +0 days 🔍
03/19/2015 +1515 days 🔍
10/13/2021 +2400 days 🔍



Advisory: Bug 658155
Status: Not defined
Confirmation: 🔍

CVE: CVE-2010-4255 (🔍)

Vulnerability Center: 29187 - Xen 3.0 through 4.0 Local DoS Vulnerability, Medium
SecurityFocus: 45099 - Xen 'fixup_page_fault()' Denial of Service Vulnerability
Secunia: 42884


Created: 03/19/2015 11:27 PM
Updated: 10/13/2021 08:12 AM
Changes: 03/19/2015 11:27 PM (62), 03/13/2017 10:01 AM (11), 10/13/2021 08:09 AM (5), 10/13/2021 08:12 AM (1)
Complete: 🔍
Cache ID: 3:3AC:40


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