Arch Linux: ASA-201612-8 High: Linux-Zen Privilege Escalation

Arch Linux Security Advisory ASA-201612-8
========================================
Severity: High
Date    : 2016-12-07
CVE-ID  : CVE-2016-8655
Package : linux-zen
Type    : privilege escalation
Remote  : No
Link    : https://wiki.archlinux.org/title/CVE

Summary
======
The package linux-zen before version 4.8.12-2 is vulnerable to
privilege escalation.

Resolution
=========
Upgrade to 4.8.12-2.

# pacman -Syu "linux-zen>=4.8.12-2"

The problem has been fixed upstream but no release is available yet.

Workaround
=========
None.

Description
==========
A race condition issue leading to a use-after-free flaw was found in
the way the raw packet sockets implementation in the Linux kernel
networking subsystem handled synchronization while creating the
TPACKET_V3 ring buffer. A local user able to open a raw packet socket
(requires the CAP_NET_RAW capability) could use this flaw to elevate
their privileges on the system.

Impact
=====
A local attacker with CAP_NET_RAW capabilities is able to crash the
system or run arbitrary code with administrative privileges.

References
=========
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/
https://seclists.org/oss-sec/2016/q4/607
https://access.redhat.com/security/cve/CVE-2016-8655