USN-3522-4: Linux kernel (Xenial HWE) regression

Ubuntu Security Notice USN-3522-4

10th January, 2018

linux-lts-xenial regression

A security issue affects these releases of Ubuntu and its

  • Ubuntu 14.04 LTS


USN-3522-2 introduced a regression in the Linux Hardware Enablement kernel.

Software description

  • linux-lts-xenial
    – Linux hardware enablement kernel from Xenial for Trusty


USN-3522-2 fixed a vulnerability in the Linux Hardware Enablement
kernel for Ubuntu 14.04 LTS to address Meltdown (CVE-2017-5754).
Unfortunately, that update introduced a regression where a few systems
failed to boot successfully. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

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

Update instructions

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

Ubuntu 14.04 LTS:



To update your system, please follow these instructions:

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.


LP: 1741934,

Source From:
Original article title: USN-3522-4: Linux kernel (Xenial HWE) regression.
This full article can be read at: USN-3522-4: Linux kernel (Xenial HWE) regression.


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