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TITLE:
Linux Kernel "is_hugepage_only_range()" Denial of Service

SECUNIA ADVISORY ID:
SA14718

VERIFY ADVISORY:
http://secunia.com/advisories/14718/

CRITICAL:
Not critical

IMPACT:
DoS

WHERE:
Local system

OPERATING SYSTEM:
Linux Kernel 2.6.x
http://secunia.com/product/2719/

DESCRIPTION:
Daniel McNeil has reported a vulnerability in the Linux Kernel, which
can be exploited by malicious, local users to cause a DoS (Denial of
Service).

The vulnerability is caused due to an error in the AIO (Asynchronous
I/O) support within the "is_hugepage_only_range()" function. This can
be exploited via a specially crafted program calling the
"io_queue_init()" function and then exiting without calling the
"io_queue_release()" function.

Successful exploitation crashes the system on PPC64 and IA64
architectures, but requires that CONFIG_HUGETLB_PAGE is enabled.

The vulnerability has been reported in versions 2.6.8 and 2.6.11.
Other versions may also be affected.

SOLUTION:
Grant only trusted users access to affected systems.

PROVIDED AND/OR DISCOVERED BY:
Daniel McNeil

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