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Ubuntu 16.04 LTS: USN-4391-1 Critical: Kernel Security Issues

ubuntu
Calendar Grey June 9, 2020
Dist Ubuntu Esm H88
Ubuntu 4391-1 resolves significant kernel vulnerabilities, tackling various threats such as service disruption and data leakage.
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-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty

Details:

It was discovered that the ext4 file system implementation in the Linux

kernel did not properly handle setxattr operations in some situations. A

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

or possibly execute arbitrary code. (CVE-2019-19319)

It was discovered that memory contents previously stored in

microarchitectural special registers after RDRAND, RDSEED, and SGX EGETKEY

read operations on Intel client and Xeon E3 processors may be briefly

exposed to processes on the same or different processor cores. A local

attacker could use this to expose sensitive information. (CVE-2020-0543)

Piotr Krysiuk discovered that race conditions existed in the file system

...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical kernel information exposure ubuntu system crash

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1075-kvm      4.4.0-1075.82
  linux-image-4.4.0-1109-aws      4.4.0-1109.120
  linux-image-4.4.0-184-generic   4.4.0-184.214
  linux-image-4.4.0-184-generic-lpae  4.4.0-184.214
  linux-image-4.4.0-184-lowlatency  4.4.0-184.214
  linux-image-4.4.0-184-powerpc-e500mc  4.4.0-184.214
  linux-image-4.4.0-184-powerpc-smp  4.4.0-184.214
  linux-image-4.4.0-184-powerpc64-emb  4.4.0-184.214
  linux-image-4.4.0-184-powerpc64-smp  4.4.0-184.214
  linux-image-aws                 4.4.0.1109.113
  linux-image-generic             4.4.0.184.190
  linux-image-generic-lpae        4.4.0.184.190
  linux-image-kvm                 4.4.0.1075.73
  linux-image-lowlatency          4.4.0.184.190
  linux-image-powerpc-e500mc      4.4.0.184.190
  linux-image-powerpc-smp         4.4.0.184.190
  linux-image-powerpc64-emb       4.4.0.184.190
  linux-image-powerpc64-smp       4.4.0.184.190
  linux-image-virtual             4.4.0.184.190

Ubuntu 14.04 ESM:
  linux-image-4.4.0-1073-aws      4.4.0-1073.77
  linux-image-4.4.0-184-generic   4.4.0-184.214~14.04.1
  linux-image-4.4.0-184-generic-lpae  4.4.0-184.214~14.04.1
  linux-image-4.4.0-184-lowlatency  4.4.0-184.214~14.04.1
  linux-image-4.4.0-184-powerpc-e500mc  4.4.0-184.214~14.04.1
  linux-image-4.4.0-184-powerpc-smp  4.4.0-184.214~14.04.1
  linux-image-4.4.0-184-powerpc64-emb  4.4.0-184.214~14.04.1
  linux-image-4.4.0-184-powerpc64-smp  4.4.0-184.214~14.04.1
  linux-image-aws                 4.4.0.1073.70
  linux-image-generic-lpae-lts-xenial  4.4.0.184.161
  linux-image-generic-lts-xenial  4.4.0.184.161
  linux-image-lowlatency-lts-xenial  4.4.0.184.161
  linux-image-powerpc-e500mc-lts-xenial  4.4.0.184.161
  linux-image-powerpc-smp-lts-xenial  4.4.0.184.161
  linux-image-powerpc64-emb-lts-xenial  4.4.0.184.161
  linux-image-powerpc64-smp-lts-xenial  4.4.0.184.161
  linux-image-virtual-lts-xenial  4.4.0.184.161

Please note that the mitigation for CVE-2020-0543 requires a processor
microcode update to be applied, either from your system manufacturer
or via the intel-microcode package. The kernel update for this issue
provides the ability to disable the mitigation and to report
vulnerability status.

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-4391-1

CVE-2019-19319, CVE-2020-0543, CVE-2020-10751, CVE-2020-12114,

CVE-2020-12464, CVE-2020-12769, CVE-2020-12826, CVE-2020-1749,

https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SRBDS

Severity
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June 10, 2020

Topics%20covered

Topics Covered

security advisory denial of service critical kernel information exposure ubuntu system crash

Package Information

https://launchpad.net/ubuntu/+source/linux/4.4.0-184.214
https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1109.120
https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1075.82

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