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Ubuntu 16.04 LTS USN-3443-2 Critical: Kernel HWE Denial of Service

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Calendar Grey October 10, 2017
Scroller Ubuntu
Serious security flaws identified in Ubuntu's HWE kernel may cause denial of service; users advised to apply updates.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-hwe: Linux hardware enablement (HWE) kernel

Details:

USN-3443-1 fixed vulnerabilities in the Linux kernel for Ubuntu 17.04.

This update provides the corresponding updates for the Linux Hardware

Enablement (HWE) kernel from Ubuntu 17.04 for Ubuntu 16.04 LTS.

It was discovered that on the PowerPC architecture, the kernel did not

properly sanitize the signal stack when handling sigreturn(). A local

attacker could use this to cause a denial of service (system crash) or

possibly execute arbitrary code. (CVE-2017-1000255)

Andrey Konovalov discovered that a divide-by-zero error existed in the TCP

stack implementation in the Linux kernel. A local attacker could use this

to cause a denial of service (system crash). (CVE-2017-14106)

Topics%20covered

Topics Covered

security advisory denial of service update critical Ubuntu Linux kernel HWE

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.10.0-37-generic   4.10.0-37.41~16.04.1
  linux-image-4.10.0-37-generic-lpae  4.10.0-37.41~16.04.1
  linux-image-4.10.0-37-lowlatency  4.10.0-37.41~16.04.1
  linux-image-generic-hwe-16.04   4.10.0.37.39
  linux-image-generic-lpae-hwe-16.04  4.10.0.37.39
  linux-image-lowlatency-hwe-16.04  4.10.0.37.39

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-3443-2

https://ubuntu.com/security/notices/USN-3443-1

CVE-2017-1000255, CVE-2017-14106

Severity
critical
Lowest
Low
Medium
High
Critical

October 10, 2017

Topics%20covered

Topics Covered

security advisory denial of service update critical Ubuntu Linux kernel HWE

Package Information

https://launchpad.net/ubuntu/+source/linux-hwe/4.10.0-37.41~16.04.1

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