A race condition issue was found in the way the raw packet sockets implementation in the Linux kernel networking subsystem handled synchronization. A local user able to open a raw packet socket (requires the CAP_NET_RAW capability) could use this to waste resources in the kernels ring buffer or possibly cause a read-out-of-bounds on the heap possibly panicking the machine.

In a default or common use of Red Hat Enterprise Linux 6 and 7 this issue does not allow an unprivileged local user to use this functionality.

In order to exploit this issue the attacker needs CAP_NET_RAW capability, which needs to be granted by the administrator to the attacker's account. Since Red Hat Enterprise Linux does not have unprivileged user namespaces enabled by default, local unprivileged users also cannot abuse namespaces to grant this capability.

Upstream patch:
http://patchwork.ozlabs.org/patch/800274/