1. Ubuntu Security Notices
  2. USN-3443-1

USN-3443-1: Linux kernel vulnerabilities

Publication date

10 October 2017

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

Details

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)

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)

Update instructions

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

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.

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

Ubuntu Release Package Version
17.04 zesty linux-image-powerpc-smp –  4.10.0.37.37
linux-image-powerpc-e500mc –  4.10.0.37.37
linux-image-4.10.0-37-lowlatency –  4.10.0-37.41
linux-image-generic-lpae –  4.10.0.37.37
linux-image-lowlatency –  4.10.0.37.37
linux-image-virtual –  4.10.0.37.37
linux-image-4.10.0-1019-raspi2 –  4.10.0-1019.22
linux-image-powerpc64-smp –  4.10.0.37.37
linux-image-generic –  4.10.0.37.37
linux-image-4.10.0-37-generic-lpae –  4.10.0-37.41
linux-image-4.10.0-37-generic –  4.10.0-37.41
linux-image-powerpc64-emb –  4.10.0.37.37
linux-image-raspi2 –  4.10.0.1019.20

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References

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