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: Update to version 22.214.171.124.
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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Subject: Linux Kernel "tun_char_poll()" NULL Pointer Dereference
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