The pppol2tp_recvmsg function in drivers/net/pppol2tp.c in the Linux
kernel 2.6 before 2.6.26-rc6 allows remote attackers to cause a denial
of service (kernel heap memory corruption and system crash) and
possibly have unspecified other impact via a crafted PPPOL2TP packet
that results in a large value for a certain length variable.
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