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>> Linux Kernel "sys_perfmon()" and "clip_mkip()" Denial of Service Vulnerabilities
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Title : Linux Kernel "sys_perfmon()" and "clip_mkip()" Denial of Service Vulnerabilities
VUPEN ID : VUPEN/ADV-2006-3937
CVE ID : CVE-2006-3741 - CVE-2006-4997
Rated as : Moderate Risk 
Remotely Exploitable : Yes
Locally Exploitable : Yes
Release Date : 2006-10-06
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Two vulnerabilities have been identified in Linux Kernel, which could be exploited by attackers to cause a denial of service.
The first issue is due to an error in the "sys_perfmon()" [arch/ia64/kernel/perfmon.c] function that does not properly decrement the file descriptor reference count, which could be exploited by remote attackers to exhaust all available resources, creating a denial of service condition.
The second flaw is due to an error in the "clip_mkip()" [net/atm/clip.c] function that erroneously dereferences "skb->dev" after "clip_push()", which could be exploited to panic a vulnerable system.
Affected Products
Linux Kernel versions prior to 2.6.18
Linux Kernel versions prior to 2.4.33.4
Solution
Upgrade to Linux Kernel version 2.6.18 or 2.4.33.4 :
http://www.kernel.org
References
http://www.vupen.com/english/advisories/2006/3937
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.18
Credits
Vulnerabilities reported by ADLab (Venustech) and the vendor
ChangeLog
2006-10-06 : Initial release
2006-11-19 : Updated Solution
Vulnerability Management
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