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Ubuntu 16.04 LTS USN-4708-1 Critical Denial Of Service Issues

ubuntu
Calendar Grey January 28, 2021
Dist Ubuntu Esm H88
Multiple vulnerabilities were addressed in the Linux kernel, impacting Ubuntu versions 16.04 and 14.04 ESM, thereby enhancing system reliability.
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-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty

Details:

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 properly validate file system metadata in some situations.

An attacker could use this to construct a malicious btrfs image that, when

mounted, could cause a denial of service (system crash). (CVE-2019-19813,

CVE-2019-19816)

Bodong Zhao discovered a use-after-free in the Sun keyboard driver

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

cause a denial of service or possibly execute arbitrary code.

(CVE-2020-25669)

Daniel Axt...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service security issue critical Ubuntu system update Linux kernel linux kernel

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-201-generic   4.4.0-201.233
  linux-image-4.4.0-201-generic-lpae  4.4.0-201.233
  linux-image-4.4.0-201-lowlatency  4.4.0-201.233
  linux-image-4.4.0-201-powerpc-e500mc  4.4.0-201.233
  linux-image-4.4.0-201-powerpc-smp  4.4.0-201.233
  linux-image-4.4.0-201-powerpc64-emb  4.4.0-201.233
  linux-image-4.4.0-201-powerpc64-smp  4.4.0-201.233
  linux-image-generic             4.4.0.201.207
  linux-image-generic-lpae        4.4.0.201.207
  linux-image-lowlatency          4.4.0.201.207
  linux-image-powerpc-e500mc      4.4.0.201.207
  linux-image-powerpc-smp         4.4.0.201.207
  linux-image-powerpc64-emb       4.4.0.201.207
  linux-image-powerpc64-smp       4.4.0.201.207
  linux-image-virtual             4.4.0.201.207

Ubuntu 14.04 ESM:
  linux-image-4.4.0-201-generic   4.4.0-201.233~14.04.1
  linux-image-4.4.0-201-generic-lpae  4.4.0-201.233~14.04.1
  linux-image-4.4.0-201-lowlatency  4.4.0-201.233~14.04.1
  linux-image-4.4.0-201-powerpc-e500mc  4.4.0-201.233~14.04.1
  linux-image-4.4.0-201-powerpc-smp  4.4.0-201.233~14.04.1
  linux-image-4.4.0-201-powerpc64-emb  4.4.0-201.233~14.04.1
  linux-image-4.4.0-201-powerpc64-smp  4.4.0-201.233~14.04.1
  linux-image-generic-lpae-lts-xenial  4.4.0.201.176
  linux-image-generic-lts-xenial  4.4.0.201.176
  linux-image-lowlatency-lts-xenial  4.4.0.201.176
  linux-image-powerpc-e500mc-lts-xenial  4.4.0.201.176
  linux-image-powerpc-smp-lts-xenial  4.4.0.201.176
  linux-image-powerpc64-emb-lts-xenial  4.4.0.201.176
  linux-image-powerpc64-smp-lts-xenial  4.4.0.201.176
  linux-image-virtual-lts-xenial  4.4.0.201.176

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.

References

https://ubuntu.com/security/notices/USN-4708-1

CVE-2018-13093, CVE-2019-19813, CVE-2019-19816, CVE-2020-25669,

CVE-2020-27777

Severity
critical
Lowest
Low
Medium
High
Critical

January 28, 2021

Topics%20covered

Topics Covered

security advisory denial of service security issue critical Ubuntu system update Linux kernel linux kernel

Package Information

https://launchpad.net/ubuntu/+source/linux/4.4.0-201.233

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