Ubuntu 16.04 LTS 3753-1 Critical: Multiple Kernel Issues Alert

ubuntu

August 24, 2018

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-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 the generic SCSI driver in the Linux kernel did not

properly enforce permissions on kernel memory access. A local attacker

could use this to expose sensitive information or possibly elevate

privileges. (CVE-2017-13168)

Wen Xu discovered that a use-after-free vulnerability existed in the ext4

filesystem implementation in the Linux kernel. An attacker could use this

to construct a malicious ext4 image that, when mounted, could cause a

denial of service (system crash) or possibly execute arbitrary code.

(CVE-2018-10876, CVE-2018-10879)

Wen Xu discovered that a buffer overflow existed in the ext4 filesystem

implementation in the Linux k...

Read the Full Advisory

Topics Covered

security advisory denial of service buffer overflow critical Ubuntu kernel filesystem

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1032-kvm      4.4.0-1032.38
  linux-image-4.4.0-1066-aws      4.4.0-1066.76
  linux-image-4.4.0-1095-raspi2   4.4.0-1095.103
  linux-image-4.4.0-1099-snapdragon  4.4.0-1099.104
  linux-image-4.4.0-134-generic   4.4.0-134.160
  linux-image-4.4.0-134-generic-lpae  4.4.0-134.160
  linux-image-4.4.0-134-lowlatency  4.4.0-134.160
  linux-image-4.4.0-134-powerpc-e500mc  4.4.0-134.160
  linux-image-4.4.0-134-powerpc-smp  4.4.0-134.160
  linux-image-4.4.0-134-powerpc64-emb  4.4.0-134.160
  linux-image-4.4.0-134-powerpc64-smp  4.4.0-134.160
  linux-image-aws                 4.4.0.1066.68
  linux-image-generic             4.4.0.134.140
  linux-image-generic-lpae        4.4.0.134.140
  linux-image-kvm                 4.4.0.1032.31
  linux-image-lowlatency          4.4.0.134.140
  linux-image-powerpc-e500mc      4.4.0.134.140
  linux-image-powerpc-smp         4.4.0.134.140
  linux-image-powerpc64-emb       4.4.0.134.140
  linux-image-powerpc64-smp       4.4.0.134.140
  linux-image-raspi2              4.4.0.1095.95
  linux-image-snapdragon          4.4.0.1099.91

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.