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Ubuntu 14.04 LTS: USN-3146-2 Critical Kernel Update for Local Attacks

ubuntu
Calendar Grey November 30, 2016
Scroller Ubuntu
Patches for kernel weaknesses in Ubuntu 14.04 LTS have been issued under USN-3146-2. Immediate updating is advised to counter potential local exploits and enhance security.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

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

Details:

USN-3146-1 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 the __get_user_asm_ex implementation in the Linux

kernel for x86/x86_64 contained extended asm statements that were

incompatible with the exception table. A local attacker could use this to

gain administrative privileges. (CVE-2016-9644)

Andreas Gruenbacher and Jan Kara discovered that the filesystem

implementation in the Linux kernel did not clear the setgid bit during a

setxattr call. A local attacker could use this to possibly elevate group

privileges. (CVE-2016-7097)

Marco Grassi discovered that the driver for Areca RAID Controllers in the

Linux kernel did not properly validate control ...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory critical kernel fix linux-lts-xenial pkg update

Update Instructions

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

Ubuntu 14.04 LTS:
  linux-image-4.4.0-51-generic    4.4.0-51.72~14.04.1
  linux-image-4.4.0-51-generic-lpae  4.4.0-51.72~14.04.1
  linux-image-4.4.0-51-lowlatency  4.4.0-51.72~14.04.1
  linux-image-4.4.0-51-powerpc-e500mc  4.4.0-51.72~14.04.1
  linux-image-4.4.0-51-powerpc-smp  4.4.0-51.72~14.04.1
  linux-image-4.4.0-51-powerpc64-emb  4.4.0-51.72~14.04.1
  linux-image-4.4.0-51-powerpc64-smp  4.4.0-51.72~14.04.1
  linux-image-generic-lpae-lts-xenial  4.4.0.51.38
  linux-image-generic-lts-xenial  4.4.0.51.38
  linux-image-lowlatency-lts-xenial  4.4.0.51.38
  linux-image-powerpc-e500mc-lts-xenial  4.4.0.51.38
  linux-image-powerpc-smp-lts-xenial  4.4.0.51.38
  linux-image-powerpc64-emb-lts-xenial  4.4.0.51.38
  linux-image-powerpc64-smp-lts-xenial  4.4.0.51.38
  linux-image-virtual-lts-xenial  4.4.0.51.38

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-3146-2

https://ubuntu.com/security/notices/USN-3146-1

CVE-2016-7097, CVE-2016-7425, CVE-2016-8658, CVE-2016-9644

Severity
critical
Lowest
Low
Medium
High
Critical

November 30, 2016

Topics%20covered

Topics Covered

security advisory critical kernel fix linux-lts-xenial pkg update

Package Information

https://launchpad.net/ubuntu/+source/linux-lts-xenial/4.4.0-51.72~14.04.1

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