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Ubuntu 14.04 LTS USN-3485-2: Critical Kernel Issues and DoS Risks

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Calendar Grey November 21, 2017
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Essential patches for Ubuntu 14.04 LTS tackle numerous complications within the Linux kernel that could lead to possible denial of service vulnerabilities.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

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

Details:

USN-3485-1 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 LTS.

It was discovered that a race condition existed in the ALSA subsystem of

the Linux kernel when creating and deleting a port via ioctl(). A local

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

possibly execute arbitrary code. (CVE-2017-15265)

Eric Biggers discovered that the key management subsystem in the Linux

kernel did not properly restrict adding a key that already exists but is

uninstantiated. A local attacker could use this to cause a denial of

service (system crash) or possibly execute arbitrary code. (CVE-2017-15299)

It was discovered that a race condition existed in the pack...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service update instructions system crash security issues Linux kernel Ubuntu 14.04 LTS

Update Instructions

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

Ubuntu 14.04 LTS:
  linux-image-4.4.0-101-generic   4.4.0-101.124~14.04.1
  linux-image-4.4.0-101-generic-lpae  4.4.0-101.124~14.04.1
  linux-image-4.4.0-101-lowlatency  4.4.0-101.124~14.04.1
  linux-image-4.4.0-101-powerpc-e500mc  4.4.0-101.124~14.04.1
  linux-image-4.4.0-101-powerpc-smp  4.4.0-101.124~14.04.1
  linux-image-4.4.0-101-powerpc64-emb  4.4.0-101.124~14.04.1
  linux-image-4.4.0-101-powerpc64-smp  4.4.0-101.124~14.04.1
  linux-image-generic-lpae-lts-xenial  4.4.0.101.84
  linux-image-generic-lts-xenial  4.4.0.101.84
  linux-image-lowlatency-lts-xenial  4.4.0.101.84
  linux-image-powerpc-e500mc-lts-xenial  4.4.0.101.84
  linux-image-powerpc-smp-lts-xenial  4.4.0.101.84
  linux-image-powerpc64-emb-lts-xenial  4.4.0.101.84
  linux-image-powerpc64-smp-lts-xenial  4.4.0.101.84

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-3485-1

CVE-2017-15265, CVE-2017-15299, CVE-2017-15649, CVE-2017-15951,

CVE-2017-16525, CVE-2017-16526, CVE-2017-16527, CVE-2017-16529,

CVE-2017-16530, CVE-2017-16531, CVE-2017-16533, CVE-2017-16534,

CVE-2017-16535

Severity
critical
Lowest
Low
Medium
High
Critical

November 21, 2017

Topics%20covered

Topics Covered

security advisory denial of service update instructions system crash security issues Linux kernel Ubuntu 14.04 LTS

Package Information

https://launchpad.net/ubuntu/+source/linux-lts-xenial/4.4.0-101.124~14.04.1

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