Arch Linux alert ASA-201612-8 (linux-zen)

From:
    	     
 
Levente Polyak <anthraxx@archlinux.org> 
To:
    	     
 
arch-security@archlinux.org 
Subject:
    	     
 
[arch-security] [ASA-201612-8] linux-zen: privilege escalation 
Date:
    	     
 
Fri, 9 Dec 2016 03:23:57 +0100
Message-ID:
    	     
 
<8375fb2c-c590-1a1d-ff6e-e2f1277b37ab@archlinux.org>
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/lin...
http://seclists.org/oss-sec/2016/q4/607
https://access.redhat.com/security/cve/CVE-2016-8655