system
Describe <CVE-2018-9439>.
user
What is <CVE-2018-9439>?
assistant
In __unregister_prot_hook and packet_release of af_packet.c, there is a
    possible use-after-free due to improper locking. This could lead to local
    escalation of privilege in the kernel with System execution privileges
    needed. User interaction is not needed for exploitation..