Linux Kernel authentication spoofing

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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A vulnerability was found in Linux Kernel (Operating System). It has been rated as problematic. Affected by this issue is an unknown part. The manipulation with an unknown input leads to a authentication spoofing vulnerability. Using CWE to declare the problem leads to CWE-290. This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks. Impacted is confidentiality, integrity, and availability. CVE summarizes:

The DNS resolution functionality in the CIFS implementation in the Linux kernel before 2.6.35, when CONFIG_CIFS_DFS_UPCALL is enabled, relies on a user s keyring for the dns_resolver upcall in the cifs.upcall userspace helper, which allows local users to spoof the results of DNS queries and perform arbitrary CIFS mounts via vectors involving an add_key call, related to a "cache stuffing" issue and MS-DFS referrals.

The issue has been introduced in 03/20/2006. The weakness was presented 09/08/2010 as confirmed git commit (GIT Repository). The advisory is available at This vulnerability is handled as CVE-2010-2524. Local access is required to approach this attack. No form of authentication is required for exploitation. The technical details are unknown and an exploit is not available.

The vulnerability was handled as a non-public zero-day exploit for at least 1633 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 75548 (openSUSE Security Update : Kernel (openSUSE-SU-2010:0592-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 165606 (SUSE Enterprise Linux Security Update Linux Kernel (SUSE-SA:2010:040)).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at

The vulnerability is also documented in the databases at Tenable (75548), SecurityFocus (BID 41904†) and Vulnerability Center (SBV-26749†).







CPE 2.3info

CPE 2.2info


VulDB CVSS-B Score: 🔍
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VulDB Meta Base Score: 6.8
VulDB Meta Temp Score: 6.7

VulDB Base Score: 5.9
VulDB Temp Score: 5.7
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NVD Base Score: 7.8
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Class: Authentication spoofing
CWE: CWE-290 / CWE-287

Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

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Current Price Estimation: 🔍


Nessus ID: 75548
Nessus Name: openSUSE Security Update : Kernel (openSUSE-SU-2010:0592-1)
Nessus File: 🔍
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OpenVAS ID: 69970
OpenVAS Name: Debian Security Advisory DSA 2264-1 (linux-2.6)
OpenVAS File: 🔍
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Threat Intelligenceinfo

Interest: 🔍
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Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: 4c0c03ca54f72fdd5912516ad0a23ec5cf01bda7


03/20/2006 🔍
06/30/2010 +1562 days 🔍
07/22/2010 +22 days 🔍
08/03/2010 +12 days 🔍
08/10/2010 +7 days 🔍
09/08/2010 +29 days 🔍
09/08/2010 +0 days 🔍
06/13/2014 +1374 days 🔍
03/19/2015 +279 days 🔍
09/24/2021 +2381 days 🔍



Advisory: USN-1000-1
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2010-2524 (🔍)

SecurityFocus: 41904 - Linux Kernel CIFS DNS Lookup Cache Poisoning Vulnerability
Secunia: 43315
Vulnerability Center: 26749 - Linux Kernel Prior to 2.6.35-rc6 Local Cache-Poisoning Vulnerability, Medium


Created: 03/19/2015 02:37 PM
Updated: 09/24/2021 02:21 PM
Changes: 03/19/2015 02:37 PM (68), 03/02/2017 11:05 AM (9), 09/24/2021 02:17 PM (7), 09/24/2021 02:20 PM (12), 09/24/2021 02:21 PM (1)
Complete: 🔍
Cache ID: 35:139:40


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