Subject: [ASA-201612-11] linux-grsec: denial of service

Arch Linux Security Advisory ASA-201612-11
==========================================

Severity: High
Date    : 2016-12-10
CVE-ID  : CVE-2016-9919
Package : linux-grsec
Type    : denial of service
Remote  : Yes
Link    : https://security.archlinux.org/AVG-103

Summary
=======

The package linux-grsec before version 1:4.8.12.r201612062306-2 is
vulnerable to denial of service.

Resolution
==========

Upgrade to 1:4.8.12.r201612062306-2.

# pacman -Syu "linux-grsec>=1:4.8.12.r201612062306-2"

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

Workaround
==========

None.

Description
===========

The icmp6_send function in net/ipv6/icmp.c in the Linux kernel through
4.8.12 omits a certain check of the dst data structure, which allows
remote attackers to cause a denial of service (panic) via a fragmented
IPv6 packet.

Impact
======

A remote attacker can cause a kernel panic by sending a fragmented IPv6
packet.

References
==========

https://bugzilla.kernel.org/show_bug.cgi?id=189851
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=79dc7e3f1cd323be4c81aa1a94faa1b3ed987fb2
https://security.archlinux.org/CVE-2016-9919