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Ubuntu Security Notice USN-3594-1
March 09, 2018

linux vulnerability
==========================================================================

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

– Ubuntu 14.04 LTS

Summary:

The system could be made to expose sensitive information.

Software Description:
– linux: Linux kernel

Details:

USN-3542-1 mitigated CVE-2017-5715 (Spectre Variant 2) for the
amd64 architecture in Ubuntu 14.04 LTS. This update provides the
compiler-based retpoline kernel mitigation for the amd64 and i386
architectures. Original advisory details:

Jann Horn discovered that microprocessors utilizing speculative execution
and branch prediction may allow unauthorized memory reads via sidechannel
attacks. This flaw is known as Spectre. A local attacker could use this to
expose sensitive information, including kernel memory. (CVE-2017-5715)

Update instructions:

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

Ubuntu 14.04 LTS:
linux-image-3.13.0-143-generic 3.13.0-143.192
linux-image-3.13.0-143-generic-lpae 3.13.0-143.192
linux-image-3.13.0-143-lowlatency 3.13.0-143.192
linux-image-generic 3.13.0.143.153
linux-image-generic-lpae 3.13.0.143.153
linux-image-lowlatency 3.13.0.143.153

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:
https://usn.ubuntu.com/usn/usn-3594-1
CVE-2017-5715, https://usn.ubuntu.com/3542-1/

Package Information:
https://launchpad.net/ubuntu/+source/linux/3.13.0-143.192

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