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SYNTHESIS OF THE VULNERABILITY

A local attacker can force the usage of a freed memory area in the
peer_wait_queue() function of the Linux kernel, in order to
trigger a denial of service, and possibly to run code.

– Impacted products: Debian, Fedora, Linux.
– Severity: 2/4.
– Creation date: 18/11/2015.

DESCRIPTION OF THE VULNERABILITY

The Linux kernel implements an epoll wait mechanism which can
monitor Unix sockets (AF_UNIX) stored in a chained list.

However, if the socket is closed, the reference in this list is
still used.

A local attacker can therefore force the usage of a freed memory
area in the peer_wait_queue() function of the Linux kernel, in
order to trigger a denial of service, and possibly to run code.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Linux-kernel-use-after-free-via-peer-wait-queue-18328