==========================================================================
Ubuntu Security Notice USN-3053-1
August 10, 2016
linux-lts-vivid vulnerabilities
==========================================================================
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 an
error condition occurred. A local attacker could use this to cause a denial
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 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 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/3.19.0-66.74~14.04.1
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