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TITLE:
Linux Kernel "tun_char_poll()" NULL Pointer Dereference

SECUNIA ADVISORY ID:
SA35839

VERIFY ADVISORY:
http://secunia.com/advisories/35839/

DESCRIPTION:
A vulnerability has been reported in the Linux Kernel, which can be
exploited by malicious, local users to cause a DoS (Denial of
Service) and potentially gain escalated privileges.

The vulnerability is caused due to a potential NULL pointer
dereference within the "tun_chr_poll()" function in
drivers/net/tun.c. This can be exploited to cause a crash and
potentially execute arbitrary code with root privileges by opening
and polling a tun device.

Successful exploitation requires that the kernel was e.g. compiled
with GCC's "-fdelete-null-pointer-checks" optimisation.

The vulnerability is reported in version 2.6.30.

SOLUTION:
Fixed in the GIT repository.

PROVIDED AND/OR DISCOVERED BY:
Eugene Kapun.

Additional information provided by Brad Spengler.

ORIGINAL ADVISORY:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=3c8a9c63d5fd738c261bd0ceece04d9c8357ca13

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