Ubuntu 16.04 LTS USN-3378-1 Moderate: Kernel Denial of Service Threat

ubuntu

August 3, 2017

Several security issues were fixed in the Linux kernel.

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-raspi2: Linux kernel for Raspberry Pi 2

- linux-snapdragon: Linux kernel for Snapdragon processors

Details:

Fan Wu and Shixiong Zhao discovered a race condition between inotify events

and vfs rename operations in the Linux kernel. An unprivileged local

attacker could use this to cause a denial of service (system crash) or

execute arbitrary code. (CVE-2017-7533)

It was discovered that the Linux kernel did not properly restrict

RLIMIT_STACK size. A local attacker could use this in conjunction with

another vulnerability to possibly execute arbitrary code.

(CVE-2017-1000365)

李强 discovered that the Virtio GPU driver in the Linux kernel did not

properly free memory in some situations. A local attacker could use this to

...

Read the Full Advisory

Topics Covered

security advisory denial of service arbitrary code execution patch ubuntu system crash linux kernel

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1024-gke      4.4.0-1024.24
  linux-image-4.4.0-1028-aws      4.4.0-1028.37
  linux-image-4.4.0-1067-raspi2   4.4.0-1067.75
  linux-image-4.4.0-1069-snapdragon  4.4.0-1069.74
  linux-image-4.4.0-89-generic    4.4.0-89.112
  linux-image-4.4.0-89-generic-lpae  4.4.0-89.112
  linux-image-4.4.0-89-lowlatency  4.4.0-89.112
  linux-image-4.4.0-89-powerpc-e500mc  4.4.0-89.112
  linux-image-4.4.0-89-powerpc-smp  4.4.0-89.112
  linux-image-4.4.0-89-powerpc64-emb  4.4.0-89.112
  linux-image-4.4.0-89-powerpc64-smp  4.4.0-89.112
  linux-image-aws                 4.4.0.1028.31
  linux-image-generic             4.4.0.89.95
  linux-image-generic-lpae        4.4.0.89.95
  linux-image-gke                 4.4.0.1024.26
  linux-image-lowlatency          4.4.0.89.95
  linux-image-powerpc-e500mc      4.4.0.89.95
  linux-image-powerpc-smp         4.4.0.89.95
  linux-image-powerpc64-emb       4.4.0.89.95
  linux-image-powerpc64-smp       4.4.0.89.95
  linux-image-raspi2              4.4.0.1067.68
  linux-image-snapdragon          4.4.0.1069.62

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.