[arch-security] [ASA-201612-8] linux-zen: privilege escalation

Fri Dec 9 02:23:57 UTC 2016

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/index.php/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/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=84ac7260236a49c79eede91617700174c2c19b0c
http://seclists.org/oss-sec/2016/q4/607
https://access.redhat.com/security/cve/CVE-2016-8655

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