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TITLE: Linux Kernel "fget()" Potential Denial of Service Vulnerability
SECUNIA ADVISORY ID: SA16897
VERIFY ADVISORY: http://secunia.com/advisories/16897/
CRITICAL: Less critical
WHERE: Local system
OPERATING SYSTEM: Linux Kernel 2.6.x http://secunia.com/product/2719/
DESCRIPTION: Vasiliy Averin has reported a vulnerability in the Linux kernel, which potentially can be exploited by malicious, local users to cause a DoS (Denial of Service).
The vulnerability is caused due to the missing use of "sockfd_put()" in "routing_ioctl()" on 64-bit platforms. This may be exploited to overrun a reference counter via a large number of fget() requests. Subsequent call to fput() will cause resources to be incorrectly freed, which can potentially crash the kernel. Similar vulnerability exists in "tiocgdev()" on x86-64 platforms.
The vulnerability only affects 64-bit platforms.
SOLUTION: The vulnerability has been fixed in version 184.108.40.206.
PROVIDED AND/OR DISCOVERED BY: Vasiliy Averin
ORIGINAL ADVISORY: Kernel.org: http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-220.127.116.11
About: This Advisory was delivered by Secunia as a free service to help everybody keeping their systems up to date against the latest vulnerabilities.
Definitions: (Criticality, Where etc.) http://secunia.com/about_secunia_advisories/
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