TITLE:
Linux Kernel Multiple Vulnerabilities

SECUNIA ADVISORY ID:
SA13572

VERIFY ADVISORY:
http://secunia.com/advisories/13572/

CRITICAL:
Less critical

IMPACT:
Exposure of sensitive information, DoS

WHERE:
Local system

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

DESCRIPTION:
Multiple vulnerabilities have been reported in the Linux Kernel,
which can be exploited by malicious, local users to cause a DoS
(Denial of Service) or gain knowledge of potentially sensitive
information.

1) A NULL pointer dereference error in the "aio_free_ring()" system
call can be exploited to crash the system by mapping out as much of
the process address space as possible and then call the "io_setup()"
function with an extremely large value (about 65000) in the
"nr_events" argument.

The vulnerability has been reported in version 2.6.9. Other versions
may also be affected.

2) An error in the DRM (Direct Rendering Manager) drivers due to
insufficient DMA lock checking can be exploited to crash the X server
or modify video output.

3) A race condition within the handling of "/proc/.../cmdline" may
disclose the content of environment variables of spawning processes.

SOLUTION:
Secunia is currently not aware of an updated version, which fixes the
vulnerabilities.

Grant only trusted users access to affected systems.

PROVIDED AND/OR DISCOVERED BY:
1) Darrick J. Wong
2) Thomas Hellström
3) Rob Landley

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

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