[USN-3597-1] Linux kernel vulnerabilities

[Steve Beattie]

==========================================================================
Ubuntu Security Notice USN-3597-1
March 15, 2018

linux, linux-raspi2 vulnerabilities
==========================================================================

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

- Ubuntu 17.10

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux: Linux kernel
- linux-raspi2: Linux kernel for Raspberry Pi 2

Details:

USNS 3541-1 and 3523-1 provided mitigations for Spectre and Meltdown
(CVE-2017-5715, CVE-2017-5753, CVE-2017-5754) for the i386, amd64,
and ppc64el architectures in Ubuntu 17.10. This update provides
the corresponding mitigations for the arm64 architecture. 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.
 (CVE-2017-5754)

 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,
 CVE-2017-5753)

Update instructions:

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

Ubuntu 17.10:
  linux-image-4.13.0-1015-raspi2  4.13.0-1015.16
  linux-image-4.13.0-37-generic   4.13.0-37.42
  linux-image-4.13.0-37-generic-lpae  4.13.0-37.42
  linux-image-4.13.0-37-lowlatency  4.13.0-37.42
  linux-image-generic             4.13.0.37.40
  linux-image-generic-lpae        4.13.0.37.40
  linux-image-lowlatency          4.13.0.37.40
  linux-image-raspi2              4.13.0.1015.13

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-3597-1,
  https://usn.ubuntu.com/usn/usn-3523-1,
  https://usn.ubuntu.com/usn/usn-3541-1,
  CVE-2017-5715, CVE-2017-5753, CVE-2017-5754

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.13.0-37.42
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.13.0-1015.16

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