USN-3049-1: Linux kernel vulnerabilities

Ubuntu Security Notice USN-3049-1

10th August, 2016

linux vulnerabilities

A security issue affects these releases of Ubuntu and its
derivatives:

Ubuntu 12.04 LTS

Summary

Several security issues were fixed in the kernel.

Software description

linux
– Linux kernel

Details

Ben Hawkes discovered that the Linux netfilter implementation did not
correctly perform validation when handling IPT_SO_SET_REPLACE events. A
local unprivileged attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code with administrative
privileges. (CVE-2016-3134)

Vitaly Kuznetsov discovered that the Linux kernel did not properly suppress
hugetlbfs support in X86 paravirtualized guests. An attacker in the guest
OS could cause a denial of service (guest system crash). (CVE-2016-3961)

It was discovered that the keyring implementation in the Linux kernel did
not ensure a data structure was initialized before referencing it after an
error condition occurred. A local attacker could use this to cause a denial
of service (system crash). (CVE-2016-4470)

Kangjie Lu discovered an information leak in the netlink implementation of
the Linux kernel. A local attacker could use this to obtain sensitive
information from kernel memory. (CVE-2016-5243)

Update instructions

The problem can be corrected by updating your system to the following
package version:

Ubuntu 12.04 LTS:: linux-image-3.2.0-107-powerpc-smp

3.2.0-107.148; linux-image-3.2.0-107-highbank

3.2.0-107.148; linux-image-3.2.0-107-powerpc64-smp

3.2.0-107.148; linux-image-3.2.0-107-virtual

3.2.0-107.148; linux-image-3.2.0-107-generic-pae

3.2.0-107.148; linux-image-3.2.0-107-omap

3.2.0-107.148; linux-image-3.2.0-107-generic

3.2.0-107.148

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

After a standard system update you need to reboot your computer to make
all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.