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Alerts This Week
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Ubuntu 17.10 USN-3507-1 Critical: Linux Kernel Denial of Service

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Calendar Grey December 8, 2017
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Several vulnerabilities impacting the Linux kernel have been detected and addressed in Ubuntu with urgent patches implemented.
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:

Mohamed Ghannam discovered that a use-after-free vulnerability existed in

the Netlink subsystem (XFRM) in the Linux kernel. A local attacker could

use this to cause a denial of service (system crash) or possibly execute

arbitrary code. (CVE-2017-16939)

It was discovered that the Linux kernel did not properly handle copy-on-

write of transparent huge pages. A local attacker could use this to cause a

denial of service (application crashes) or possibly gain administrative

privileges. (CVE-2017-1000405)

Fan Wu, Haoran Qiu, and Shixiong Zhao discovered that the associative array

implementation in the Linux kernel sometimes did not properly handle adding

a new entry. A local attacker could use this to cause a denial of service

(system crash). (CVE-2017-12193)

Eric Biggers discovered that the key management subsystem in the Linux

...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu kernel issue

Update Instructions

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

Ubuntu 17.10:
  linux-image-4.13.0-1008-raspi2  4.13.0-1008.8
  linux-image-4.13.0-19-generic   4.13.0-19.22
  linux-image-4.13.0-19-generic-lpae  4.13.0-19.22
  linux-image-4.13.0-19-lowlatency  4.13.0-19.22
  linux-image-generic             4.13.0.19.20
  linux-image-generic-lpae        4.13.0.19.20
  linux-image-lowlatency          4.13.0.19.20
  linux-image-raspi2              4.13.0.1008.6

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-3507-1

CVE-2017-1000405, CVE-2017-12193, CVE-2017-15299, CVE-2017-15306,

CVE-2017-15951, CVE-2017-16535, CVE-2017-16643, CVE-2017-16939

Severity
critical
Lowest
Low
Medium
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Critical

December 07, 2017

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu kernel issue

Package Information

https://launchpad.net/ubuntu/+source/linux/4.13.0-19.22
https://launchpad.net/ubuntu/+source/linux-raspi2/4.13.0-1008.8

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