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Ubuntu 17.10 USN-3597-1 Critical: Linux Kernel Security Issues

ubuntu
Calendar Grey March 15, 2018
Scroller Ubuntu
Ubuntu addresses serious vulnerabilities in the Linux kernel that pose risks to sensitive information due to speculative execution vulnerabilities.
Several security issues were fixed in the Linux kernel.

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 sensit...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory critical issue Ubuntu update instructions linux kernel memory exposure speculative execution

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://ubuntu.com/security/notices/USN-3597-1,

https://ubuntu.com/security/notices/USN-3523-1,

https://ubuntu.com/security/notices/USN-3541-1,

CVE-2017-5715, CVE-2017-5753, CVE-2017-5754

Severity
critical
Lowest
Low
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Critical

March 15, 2018

Topics%20covered

Topics Covered

security advisory critical issue Ubuntu update instructions linux kernel memory exposure speculative execution

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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