Ubuntu 16.04 LTS: USN-4709-1 Moderate: Linux Kernel Denial of Service

ubuntu

January 28, 2021

Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-kvm: Linux kernel for cloud environments

- linux-raspi2: Linux kernel for Raspberry Pi (V8) systems

- linux-snapdragon: Linux kernel for Qualcomm Snapdragon processors- linux-aws: Linux kernel for Amazon Web Services (AWS) systems

Details:

It was discovered that the LIO SCSI target implementation in the Linux

kernel performed insufficient identifier checking in certain XCOPY

requests. An attacker with access to at least one LUN in a multiple

backstore environment could use this to expose sensitive information or

modify data. (CVE-2020-28374)

Wen Xu discovered that the XFS filesystem implementation in the Linux

kernel did not properly track inode validations. An attacker could use this

to construct a malicious XFS image that, when mounted, could cause a denial

of service (system crash). (CVE-2018-13093)

It was discovered that the btrfs file system implementation in the Linux

kernel did not pro...

Read the Full Advisory

Topics Covered

security advisory moderate denial of service ubuntu linux kernel linux-raspi2 linux-snapdragon linux-aws cloud environments

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1087-kvm      4.4.0-1087.96
  linux-image-4.4.0-1145-raspi2   4.4.0-1145.155
  linux-image-4.4.0-1149-snapdragon  4.4.0-1149.159
  linux-image-kvm                 4.4.0.1087.85
  linux-image-raspi2              4.4.0.1145.145
  linux-image-snapdragon          4.4.0.1149.141

Ubuntu 14.04 ESM:
  linux-image-4.4.0-1085-aws      4.4.0-1085.89
  linux-image-aws                 4.4.0.1085.82

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.