net/xfrm/xfrmpolicy.c in the Linux kernel through 4.12.3, when CONFIGXFRMMIGRATE is enabled, does not ensure that the dir value of xfrmuserpolicyid is XFRMPOLICYMAX or less, which allows local users to cause a denial of service (out-of-bounds access) or possibly have unspecified other impact via an XFRMMSG_MIGRATE xfrm Netlink message.
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