Ubuntu 16.04 LTS: USN-3932-1 Moderate: Multiple Kernel Threats

ubuntu

April 2, 2019

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 a race condition existed in the f2fs file system

implementation in the Linux kernel. A local attacker could use this to

cause a denial of service. (CVE-2017-18249)

Wen Xu discovered that the f2fs file system implementation in the Linux

kernel did not properly validate metadata. An attacker could use this to

construct a malicious f2fs image that, when mounted, could cause a denial

of service (system crash). (CVE-2018-13097, CVE-2018-13099, CVE-2018-13100,

CVE-2018-14614, CVE-2018-14616)

Wen Xu and Po-Ning Tseng discovered that btrfs file system implementation

in the Linux kernel did not properly validate metadata. An attacker could

u...

Read the Full Advisory

Topics Covered

security advisory moderate denial of service information leak kernel ubuntu file system

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1043-kvm      4.4.0-1043.49
  linux-image-4.4.0-1079-aws      4.4.0-1079.89
  linux-image-4.4.0-1106-raspi2   4.4.0-1106.114
  linux-image-4.4.0-1110-snapdragon  4.4.0-1110.115
  linux-image-4.4.0-145-generic   4.4.0-145.171
  linux-image-4.4.0-145-generic-lpae  4.4.0-145.171
  linux-image-4.4.0-145-lowlatency  4.4.0-145.171
  linux-image-4.4.0-145-powerpc-e500mc  4.4.0-145.171
  linux-image-4.4.0-145-powerpc-smp  4.4.0-145.171
  linux-image-4.4.0-145-powerpc64-emb  4.4.0-145.171
  linux-image-4.4.0-145-powerpc64-smp  4.4.0-145.171
  linux-image-aws                 4.4.0.1079.82
  linux-image-generic             4.4.0.145.153
  linux-image-generic-lpae        4.4.0.145.153
  linux-image-kvm                 4.4.0.1043.43
  linux-image-lowlatency          4.4.0.145.153
  linux-image-powerpc-e500mc      4.4.0.145.153
  linux-image-powerpc-smp         4.4.0.145.153
  linux-image-powerpc64-emb       4.4.0.145.153
  linux-image-powerpc64-smp       4.4.0.145.153
  linux-image-raspi2              4.4.0.1106.106
  linux-image-snapdragon          4.4.0.1110.102
  linux-image-virtual             4.4.0.145.153

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.