Linux Kernel up to 2.6.17.10 Tasks Switching EFLAGS denial of service

CVSS Meta Temp Score
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CTI Interest Score
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4.1$0-$5k0.00

Summaryinfo

A vulnerability categorized as problematic has been discovered in Linux Kernel up to 2.6.17.10. This affects an unknown part of the component Tasks Switching. Executing a manipulation as part of EFLAGS can lead to denial of service. This vulnerability is tracked as CVE-2006-5173. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 2.6.17.10 (Operating System). It has been declared as problematic. This vulnerability affects an unknown functionality of the component Tasks Switching. The manipulation as part of a EFLAGS 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:

Linux kernel does not properly save or restore EFLAGS during a context switch, or reset the flags when creating new threads, which allows local users to cause a denial of service (process crash), as demonstrated using a process that sets the Alignment Check flag (EFLAGS 0x40000), which triggers a SIGBUS in other processes that have an unaligned access.

The bug was discovered 09/18/2006. The weakness was disclosed 12/14/2006 (Website). The advisory is shared for download at ubuntu.com. This vulnerability was named CVE-2006-5173 since 10/05/2006. The attack can only be done within the local network. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 29 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 24619 (Mandrake Linux Security Advisory : kernel (MDKSA-2007:002)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Mandriva Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 165110 (SUSE Security Update for Kernel (SUSE-SA:2006:079)).

Upgrading eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at ftp.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version. A possible mitigation has been published 3 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (40752), Tenable (24619), SecurityFocus (BID 21851†), OSVDB (31465†) and Secunia (SA23593†). The entries VDB-2464, VDB-2506, VDB-2663 and VDB-2755 are pretty similar. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.1

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 24619
Nessus Name: Mandrake Linux Security Advisory : kernel (MDKSA-2007:002)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
Nessus Port: 🔍

OpenVAS ID: 830168
OpenVAS Name: Zoho ManageEngine Support Center Plus Multiple Fields XSS Vulnerabilities
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Patch: ftp.kernel.org

Timelineinfo

09/18/2006 🔍
10/05/2006 +17 days 🔍
10/17/2006 +12 days 🔍
10/17/2006 +0 days 🔍
12/14/2006 +58 days 🔍
12/14/2006 +0 days 🔍
12/18/2006 +3 days 🔍
01/02/2007 +15 days 🔍
01/02/2007 +0 days 🔍
01/03/2007 +1 days 🔍
02/18/2007 +46 days 🔍
02/28/2007 +10 days 🔍
07/15/2019 +4520 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: ubuntu.com
Status: Not defined
Confirmation: 🔍

CVE: CVE-2006-5173 (🔍)
GCVE (CVE): GCVE-0-2006-5173
GCVE (VulDB): GCVE-100-2752
X-Force: 40752
SecurityFocus: 21851 - Linux Kernel EFLAGS Local Denial of Service Vulnerability
Secunia: 23593 - Mandriva update for kernel, Less Critical
OSVDB: 31465 - Linux kernel EFLAGS Restore Alignment Check DoS
Vulnerability Center: 14462 - Linux Kernel Denial of Service via EFLAGS, Low

See also: 🔍

Entryinfo

Created: 12/18/2006 10:23
Updated: 07/15/2019 20:53
Changes: 12/18/2006 10:23 (95), 07/15/2019 20:53 (1)
Complete: 🔍
Cache ID: 216:F87:103

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