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Linux Kernel Information Disclosure and Denial of Service
Secunia Advisory: SA18487
Release Date: 2006-01-17
Last Update: 2006-01-31
Popularity: 9,442 views

Critical:
Less critical
Impact: Exposure of sensitive information
DoS
Where: Local system
Solution Status: Vendor Patch

OS:Linux Kernel 2.6.x

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CVE reference:CVE-2006-0095
CVE-2005-3356


Description:
Two vulnerabilities have been reported in the Linux Kernel, which can be exploited by malicious, local users to disclose potentially sensitive information, and to cause a DoS (Denial of Service).

1) The "dm-crypt" driver fails to clear memory before freeing it. This can be exploited by local users to obtain sensitive information (e.g. cryptographic keys).

The vulnerability has been reported in version 2.6.15.1. Other versions may also be affected.

2) An error in the "mq_open" system call can cause the "mqueue_mnt->mnt_count" counter to be decremented twice when the "dentry_open" function call fails. This can potentially be exploited by malicious users to cause a kernel panic.

Solution:
Update to version 2.6.15.2.
http://kernel.org/

Provided and/or discovered by:
1) Stefan Rompf
2) Doug Chapman

Changelog:
2006-01-31: Updated "Description", "Solution" and credit sections. Added link to "Original Advisory".

Original Advisory:
Kernel.org:
http://www.kernel.org/pub/linux/kernel/v2.6/snapshots/patch-2.6.15-git12.log
http://www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.16-rc1
http://www.kernel.org/git/?p=linux/ke...520a339d62f942085e9888f66905eb8b350bd
http://marc.theaimsgroup.com/?l=linux-kernel&m=113640535312572
http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.15.2
http://www.kernel.org/git/?p=linux/ke...dce9209161eb260cdf9e9172f72c3a02379e6

Red Hat Bugzilla:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=169130


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