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[USN-3053-1] Linux kernel (Vivid HWE) vulnerabilities

Posted on 10 August 2016
Ubuntu Security

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Ubuntu Security Notice USN-3053-1
August 10, 2016

linux-lts-vivid vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux-lts-vivid: Linux hardware enablement kernel from Vivid for Trusty=


Details:

A missing permission check when settings ACLs was discovered in nfsd. A
local user could exploit this flaw to gain access to any file by setting =
an
ACL. (CVE-2016-1237)

It was discovered that the keyring implementation in the Linux kernel did=

not ensure a data structure was initialized before referencing it after a=
n
error condition occurred. A local attacker could use this to cause a deni=
al
of service (system crash). (CVE-2016-4470)

Sasha Levin discovered that a use-after-free existed in the percpu
allocator in the Linux kernel. A local attacker could use this to cause a=

denial of service (system crash) or possibly execute arbitrary code with
administrative privileges. (CVE-2016-4794)

Kangjie Lu discovered an information leak in the netlink implementation o=
f
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 versions:

Ubuntu 14.04 LTS:
linux-image-3.19.0-66-generic 3.19.0-66.74~14.04.1
linux-image-3.19.0-66-generic-lpae 3.19.0-66.74~14.04.1
linux-image-3.19.0-66-lowlatency 3.19.0-66.74~14.04.1
linux-image-3.19.0-66-powerpc-e500mc 3.19.0-66.74~14.04.1
linux-image-3.19.0-66-powerpc-smp 3.19.0-66.74~14.04.1
linux-image-3.19.0-66-powerpc64-emb 3.19.0-66.74~14.04.1
linux-image-3.19.0-66-powerpc64-smp 3.19.0-66.74~14.04.1

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.

References:
http://www.ubuntu.com/usn/usn-3053-1
CVE-2016-1237, CVE-2016-4470, CVE-2016-4794, CVE-2016-5243

Package Information:
https://launchpad.net/ubuntu/+source/linux-lts-vivid/3.19.0-66.74~14.04=
=2E1



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