Linux Kernel memory corruption

CVSS Meta Temp Score
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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 critical. This issue affects an unknown functionality. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

The Linux kernel before 2.6.31-rc7 does not properly prevent mmap operations that target page zero and other low memory addresses, which allows local users to gain privileges by exploiting NULL pointer dereference vulnerabilities, related to (1) the default configuration of the allow_unconfined_mmap_low boolean in SELinux on Red Hat Enterprise Linux (RHEL) 5, (2) an error that causes allow_unconfined_mmap_low to be ignored in the unconfined_t domain, (3) lack of a requirement for the CAP_SYS_RAWIO capability for these mmap operations, and (4) interaction between the mmap_min_addr protection mechanism and certain application programs.

The issue has been introduced in 12/25/2008. The weakness was published 08/28/2009 (Website). It is possible to read the advisory at The identification of this vulnerability is CVE-2009-2695. The exploitation is known to be easy. Attacking locally is a requirement. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/20/2021).

The vulnerability was handled as a non-public zero-day exploit for at least 246 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 79470 (OracleVM 2.2 : kernel (OVMSA-2009-0033)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family OracleVM Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 116971 (VMware ESX Service Console and vMA Third Party Updates (VMSA-2010-0004)).

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 X-Force (52934) and Tenable (79470).







CPE 2.3info

CPE 2.2info


VulDB CVSS-B Score: 🔍
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VulDB Meta Base Score: 8.4
VulDB Meta Temp Score: 8.4

VulDB Base Score: 8.4
VulDB Temp Score: 8.4
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Class: Memory corruption
CWE: CWE-119

Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

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Current Price Estimation: 🔍


Nessus ID: 79470
Nessus Name: OracleVM 2.2 : kernel (OVMSA-2009-0033)
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OpenVAS ID: 66098
OpenVAS Name: Debian Security Advisory DSA 1915-1 (linux-2.6)
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Threat Intelligenceinfo

Interest: 🔍
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Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍


12/25/2008 🔍
08/05/2009 +222 days 🔍
08/17/2009 +12 days 🔍
08/18/2009 +1 days 🔍
08/28/2009 +10 days 🔍
08/28/2009 +0 days 🔍
11/26/2014 +1916 days 🔍
03/18/2015 +112 days 🔍
08/20/2021 +2347 days 🔍



Status: Not defined
Confirmation: 🔍

CVE: CVE-2009-2695 (🔍)

X-Force: 52934
Vulnerability Center: 23225 - Linux Kernel 2.6.23 - 2.6.31-rc6 SELinux Local NULL Pointer Dereference Vulnerability, High
SecurityFocus: 36051


Created: 03/18/2015 03:15 PM
Updated: 08/20/2021 04:33 PM
Changes: 03/18/2015 03:15 PM (62), 02/13/2017 10:13 AM (7), 08/20/2021 04:25 PM (4), 08/20/2021 04:33 PM (1)
Complete: 🔍
Cache ID: 100:0D3:40


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