USN-3420-1: Linux kernel vulnerabilities

Ubuntu Security Notice USN-3420-1

18th September, 2017

linux, linux-aws, linux-gke, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities

A security issue affects these releases of Ubuntu and its
derivatives:

Ubuntu 16.04 LTS

Summary

Several security issues were fixed in the Linux kernel.

Software description

linux
– Linux kernel
linux-aws
– Linux kernel for Amazon Web Services (AWS) systems
linux-gke
– Linux kernel for Google Container Engine (GKE) systems
linux-kvm
– Linux kernel for cloud environments
linux-raspi2
– Linux kernel for Raspberry Pi 2
linux-snapdragon
– Linux kernel for Snapdragon processors

Details

It was discovered that a buffer overflow existed in the Bluetooth stack of
the Linux kernel when handling L2CAP configuration responses. A physically
proximate attacker could use this to cause a denial of service (system
crash). (CVE-2017-1000251)

It was discovered that the Flash-Friendly File System (f2fs) implementation
in the Linux kernel did not properly validate superblock metadata. A local
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2017-10663)

It was discovered that a buffer overflow existed in the ioctl handling code
in the ISDN subsystem of the Linux kernel. A local attacker could use this
to cause a denial of service (system crash) or possibly execute arbitrary
code. (CVE-2017-12762)

Pengfei Wang discovered that a race condition existed in the NXP SAA7164 TV
Decoder driver for the Linux kernel. A local attacker could use this to
cause a denial of service (system crash) or possibly execute arbitrary
code. (CVE-2017-8831)

Update instructions

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

Ubuntu 16.04 LTS:: linux-image-powerpc-e500mc 4.4.0.96.101; linux-image-4.4.0-1076-snapdragon

4.4.0-1076.81; linux-image-4.4.0-1031-gke

4.4.0-1031.31; linux-image-4.4.0-96-powerpc-e500mc

4.4.0-96.119; linux-image-4.4.0-96-powerpc64-emb

4.4.0-96.119; linux-image-4.4.0-96-generic-lpae

4.4.0-96.119; linux-image-snapdragon 4.4.0.1076.68; linux-image-4.4.0-96-powerpc64-smp

4.4.0-96.119; linux-image-powerpc64-emb 4.4.0.96.101; linux-image-gke 4.4.0.1031.32; linux-image-generic 4.4.0.96.101; linux-image-4.4.0-96-powerpc-smp

4.4.0-96.119; linux-image-4.4.0-96-lowlatency

4.4.0-96.119; linux-image-4.4.0-96-generic

4.4.0-96.119; linux-image-aws 4.4.0.1035.37; linux-image-kvm 4.4.0.1007.7; linux-image-raspi2 4.4.0.1074.74; linux-image-4.4.0-1074-raspi2

4.4.0-1074.82; linux-image-powerpc-smp 4.4.0.96.101; linux-image-generic-lpae 4.4.0.96.101; linux-image-4.4.0-1035-aws

4.4.0-1035.44; linux-image-4.4.0-1007-kvm

4.4.0-1007.12; linux-image-powerpc64-smp 4.4.0.96.101; linux-image-lowlatency 4.4.0.96.101

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

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.