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Ubuntu 14.04 ESM: USN-4211-2 Critical: Linux Kernel DoS Risks

ubuntu
Calendar Grey December 2, 2019
Dist Ubuntu Esm H88
Essential patches for Ubuntu 14.04 ESM targeting vulnerabilities in the kernel and mitigating possible denial of service threats.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-aws: Linux kernel for Amazon Web Services (AWS) systems

- linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty

Details:

USN-4211-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04

LTS. This update provides the corresponding updates for the Linux

Hardware Enablement (HWE) kernel from Ubuntu 16.04 LTS for Ubuntu

14.04 ESM.

Zhipeng Xie discovered that an infinite loop could be triggered in the CFS

Linux kernel process scheduler. A local attacker could possibly use this to

cause a denial of service. (CVE-2018-20784)

Nicolas Waisman discovered that the WiFi driver stack in the Linux kernel

did not properly validate SSID lengths. A physically proximate attacker

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

(CVE-2019-17133)

Nicolas Waisman discovered that the Chelsio T4/T5 RDMA Driver for the Linux

kernel performed DMA from a kernel stack. A local attack...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service system crash linux-lts-xenial linux-aws CFS scheduler

Update Instructions

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

Ubuntu 14.04 ESM:
  linux-image-4.4.0-1059-aws      4.4.0-1059.63
  linux-image-4.4.0-170-generic   4.4.0-170.199~14.04.1
  linux-image-4.4.0-170-generic-lpae  4.4.0-170.199~14.04.1
  linux-image-4.4.0-170-lowlatency  4.4.0-170.199~14.04.1
  linux-image-4.4.0-170-powerpc-e500mc  4.4.0-170.199~14.04.1
  linux-image-4.4.0-170-powerpc-smp  4.4.0-170.199~14.04.1
  linux-image-4.4.0-170-powerpc64-emb  4.4.0-170.199~14.04.1
  linux-image-4.4.0-170-powerpc64-smp  4.4.0-170.199~14.04.1
  linux-image-aws                 4.4.0.1059.60
  linux-image-generic-lpae-lts-xenial  4.4.0.170.149
  linux-image-generic-lts-xenial  4.4.0.170.149
  linux-image-lowlatency-lts-xenial  4.4.0.170.149
  linux-image-powerpc-e500mc-lts-xenial  4.4.0.170.149
  linux-image-powerpc-smp-lts-xenial  4.4.0.170.149
  linux-image-powerpc64-emb-lts-xenial  4.4.0.170.149
  linux-image-powerpc64-smp-lts-xenial  4.4.0.170.149
  linux-image-virtual-lts-xenial  4.4.0.170.149

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-4211-2

https://ubuntu.com/security/notices/USN-4211-1

CVE-2018-20784, CVE-2019-17075, CVE-2019-17133

Severity
critical
Lowest
Low
Medium
High
Critical

December 03, 2019

Topics%20covered

Topics Covered

security advisory denial of service system crash linux-lts-xenial linux-aws CFS scheduler

Package Information

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