[SA16897] Linux Kernel "fget()" Potential Denial of Service Vulnerability

2005-09-26T00:00:00
ID SECURITYVULNS:DOC:9796
Type securityvulns
Reporter Securityvulns
Modified 2005-09-26T00:00:00

Description


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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

IMPACT: DoS

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 2.6.13.2.

PROVIDED AND/OR DISCOVERED BY: Vasiliy Averin

ORIGINAL ADVISORY: Kernel.org: http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.13.2


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