USN-4320-1: Linux kernel vulnerability
linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon vulnerability
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 16.04 LTS
- Ubuntu 14.04 ESM
Summary
The system could be made to crash or expose sensitive information.
Software Description
- linux – Linux kernel
- linux-aws – Linux kernel for Amazon Web Services (AWS) systems
- linux-kvm – Linux kernel for cloud environments
- linux-raspi2 – Linux kernel for Raspberry Pi 2
- linux-snapdragon – Linux kernel for Snapdragon processors
- linux-lts-xenial – Linux hardware enablement kernel from Xenial for
Trusty
Details
Al Viro discovered that the vfs layer in the Linux kernel contained a use-
after-free vulnerability. A local attacker could use this to cause a denial
of service (system crash) or possibly expose sensitive information (kernel
memory).
Update instructions
The problem can be corrected by updating your system to the following package versions:
- Ubuntu 16.04 LTS
- linux-image-4.4.0-1069-kvm – 4.4.0-1069.76
- linux-image-4.4.0-1105-aws – 4.4.0-1105.116
- linux-image-4.4.0-1131-raspi2 – 4.4.0-1131.140
- linux-image-4.4.0-1135-snapdragon – 4.4.0-1135.143
- linux-image-4.4.0-177-generic – 4.4.0-177.207
- linux-image-4.4.0-177-generic-lpae – 4.4.0-177.207
- linux-image-4.4.0-177-lowlatency – 4.4.0-177.207
- linux-image-4.4.0-177-powerpc-e500mc – 4.4.0-177.207
- linux-image-4.4.0-177-powerpc-smp – 4.4.0-177.207
- linux-image-4.4.0-177-powerpc64-emb – 4.4.0-177.207
- linux-image-4.4.0-177-powerpc64-smp – 4.4.0-177.207
- linux-image-aws – 4.4.0.1105.109
- linux-image-generic – 4.4.0.177.185
- linux-image-generic-lpae – 4.4.0.177.185
- linux-image-kvm – 4.4.0.1069.69
- linux-image-lowlatency – 4.4.0.177.185
- linux-image-powerpc-e500mc – 4.4.0.177.185
- linux-image-powerpc-smp – 4.4.0.177.185
- linux-image-powerpc64-emb – 4.4.0.177.185
- linux-image-powerpc64-smp – 4.4.0.177.185
- linux-image-raspi2 – 4.4.0.1131.131
- linux-image-snapdragon – 4.4.0.1135.127
- linux-image-virtual – 4.4.0.177.185
- Ubuntu 14.04 ESM
- linux-image-4.4.0-1065-aws – 4.4.0-1065.69
- linux-image-4.4.0-177-generic – 4.4.0-177.207~14.04.1
- linux-image-4.4.0-177-generic-lpae – 4.4.0-177.207~14.04.1
- linux-image-4.4.0-177-lowlatency – 4.4.0-177.207~14.04.1
- linux-image-4.4.0-177-powerpc-e500mc – 4.4.0-177.207~14.04.1
- linux-image-4.4.0-177-powerpc-smp – 4.4.0-177.207~14.04.1
- linux-image-4.4.0-177-powerpc64-emb – 4.4.0-177.207~14.04.1
- linux-image-4.4.0-177-powerpc64-smp – 4.4.0-177.207~14.04.1
- linux-image-aws – 4.4.0.1065.66
- linux-image-generic-lpae-lts-xenial – 4.4.0.177.156
- linux-image-generic-lts-xenial – 4.4.0.177.156
- linux-image-lowlatency-lts-xenial – 4.4.0.177.156
- linux-image-powerpc-e500mc-lts-xenial – 4.4.0.177.156
- linux-image-powerpc-smp-lts-xenial – 4.4.0.177.156
- linux-image-powerpc64-emb-lts-xenial – 4.4.0.177.156
- linux-image-powerpc64-smp-lts-xenial – 4.4.0.177.156
- linux-image-virtual-lts-xenial – 4.4.0.177.156
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.
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