USN-3249-1: Linux kernel vulnerability

Releases

• Ubuntu 16.04 ESM

Packages

• linux - Linux kernel
• linux-aws - Linux kernel for Amazon Web Services (AWS) systems
• linux-gke - Linux kernel for Google Container Engine (GKE) systems
• linux-raspi2 - Linux kernel for Raspberry Pi 2
• linux-snapdragon - Linux kernel for Snapdragon Processors

Details

It was discovered that the xfrm framework for transforming packets in the
Linux kernel did not properly validate data received from user space. A
local attacker could use this to cause a denial of service (system crash)
or execute arbitrary code with administrative privileges.

Update instructions

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

Ubuntu 16.04

• linux-image-4.4.0-1009-gke - 4.4.0-1009.9
• linux-image-4.4.0-1012-aws - 4.4.0-1012.21
• linux-image-4.4.0-1051-raspi2 - 4.4.0-1051.58
• linux-image-4.4.0-1054-snapdragon - 4.4.0-1054.58
• linux-image-4.4.0-71-generic - 4.4.0-71.92
• linux-image-4.4.0-71-generic-lpae - 4.4.0-71.92
• linux-image-4.4.0-71-lowlatency - 4.4.0-71.92
• linux-image-4.4.0-71-powerpc-e500mc - 4.4.0-71.92
• linux-image-4.4.0-71-powerpc-smp - 4.4.0-71.92
• linux-image-4.4.0-71-powerpc64-smp - 4.4.0-71.92

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

• CVE-2017-7184

Related notices

• USN-3248-1
• USN-3250-1
• USN-3251-2
• USN-3250-2
• USN-3251-1
• USN-3249-2