USN-3220-1: Linux kernel vulnerability

Releases

• Ubuntu 16.04 ESM

Packages

• linux - Linux kernel
• 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

Alexander Popov discovered that the N_HDLC line discipline implementation
in the Linux kernel contained a double-free vulnerability. A local attacker
could use this to cause a denial of service (system crash) or possibly gain
administrative privileges.

Update instructions

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

Ubuntu 16.04

• linux-image-4.4.0-1005-gke - 4.4.0-1005.6
• linux-image-4.4.0-1046-raspi2 - 4.4.0-1046.53
• linux-image-4.4.0-1050-snapdragon - 4.4.0-1050.54
• linux-image-4.4.0-66-generic - 4.4.0-66.87
• linux-image-4.4.0-66-generic-lpae - 4.4.0-66.87
• linux-image-4.4.0-66-lowlatency - 4.4.0-66.87
• linux-image-4.4.0-66-powerpc-e500mc - 4.4.0-66.87
• linux-image-4.4.0-66-powerpc-smp - 4.4.0-66.87
• linux-image-4.4.0-66-powerpc64-emb - 4.4.0-66.87
• linux-image-4.4.0-66-powerpc64-smp - 4.4.0-66.87

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-2017-2636

Related notices

• USN-3220-2: linux-image-4.4.0-66-powerpc64-emb, linux-image-4.4.0-66-generic-lpae, linux-image-4.4.0-66-powerpc64-smp, linux-image-4.4.0-66-generic, linux-image-extra-4.4.0-66-generic, linux-image-4.4.0-66-lowlatency, linux-image-4.4.0-66-powerpc-smp, linux-lts-xenial, linux-image-4.4.0-66-powerpc-e500mc
• USN-3220-3: linux-aws, linux-image-4.4.0-1007-aws
• USN-3221-2: linux-hwe, linux-image-extra-4.8.0-41-generic, linux-image-4.8.0-41-lowlatency, linux-image-4.8.0-41-generic-lpae, linux-image-4.8.0-41-generic
• USN-3219-1: linux-image-3.13.0-112-generic-lpae, linux, linux-image-3.13.0-112-generic, linux-image-3.13.0-112-powerpc-e500mc, linux-image-3.13.0-112-powerpc-e500, linux-image-3.13.0-112-powerpc-smp, linux-image-3.13.0-112-powerpc64-smp, linux-image-extra-3.13.0-112-generic, linux-image-3.13.0-112-lowlatency, linux-image-3.13.0-112-powerpc64-emb
• USN-3219-2: linux-image-3.13.0-112-generic-lpae, linux-image-3.13.0-112-generic, linux-lts-trusty, linux-image-generic-lpae-lts-trusty, linux-image-generic-lts-trusty
• USN-3218-1: linux-image-highbank, linux-image-3.2.0-124-powerpc64-smp, linux, linux-image-powerpc-smp, linux-image-generic, linux-image-virtual, linux-image-3.2.0-124-highbank, linux-image-3.2.0-124-generic, linux-image-omap4, linux-image-powerpc64-smp, linux-image-omap, linux-image-3.2.0-124-omap, linux-image-3.2.0-124-powerpc-smp, linux-image-generic-pae, linux-image-3.2.0-124-virtual, linux-image-3.2.0-124-generic-pae, linux-ti-omap4, linux-image-3.2.0-1502-omap4
• USN-3221-1: linux-image-4.8.0-1028-raspi2, linux-image-4.8.0-41-powerpc64-emb, linux-raspi2, linux-image-4.8.0-41-powerpc-smp, linux, linux-image-powerpc-smp, linux-image-generic, linux-image-lowlatency, linux-image-powerpc64-emb, linux-image-raspi2, linux-image-4.8.0-41-lowlatency, linux-image-4.8.0-41-powerpc-e500mc, linux-image-4.8.0-41-generic-lpae, linux-image-generic-lpae, linux-image-powerpc-e500mc, linux-image-4.8.0-41-generic