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Ubuntu 14.04: USN-2908-5 Moderate: Kernel Regression Graphics Fix

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Calendar Grey February 27, 2016
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Addresses regression issues in Ubuntu 14.04 LTS kernel caused by enhancements introduced in Ubuntu 15.10. Vital for maintaining system reliability and safeguarding against vulnerabilities.
USN-2908-2 introduced a regression in the Ubuntu 15.10 Linux kernelbackported to Ubuntu 14.04 LTS.

Summary

USN-2908-2 introduced a regression in the Ubuntu 15.10 Linux kernel

backported to Ubuntu 14.04 LTS.

Software Description:

- linux-lts-wily: Linux hardware enablement kernel from Wily for Trusty

Details:

USN-2908-2 fixed vulnerabilities in the Ubuntu 15.10 Linux kernel

backported to Ubuntu 14.04 LTS. An incorrect locking fix caused a

regression that broke graphics displays for Ubuntu 14.04 LTS guests

running the Ubuntu 15.10 backport kernel within VMWare virtual

machines. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

halfdog discovered that OverlayFS, when mounting on top of a FUSE mount,

incorrectly propagated file attributes, including setuid. A local

unprivileged attacker could use this to gain privileges. (CVE-2016-1576)

halfdog discovered that OverlayFS in the Linux kernel incorrectly

propagated security sensitive extended attributes, such as POSIX ACLs. A

local unprivileged attacker could use this to gain privileges.

...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service ubuntu linux-lts-wily kernel regression graphics issue

Update Instructions

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

Ubuntu 14.04 LTS:
  linux-image-4.2.0-30-generic    4.2.0-30.36~14.04.1
  linux-image-4.2.0-30-generic-lpae  4.2.0-30.36~14.04.1
  linux-image-4.2.0-30-lowlatency  4.2.0-30.36~14.04.1
  linux-image-4.2.0-30-powerpc-e500mc  4.2.0-30.36~14.04.1
  linux-image-4.2.0-30-powerpc-smp  4.2.0-30.36~14.04.1
  linux-image-4.2.0-30-powerpc64-emb  4.2.0-30.36~14.04.1
  linux-image-4.2.0-30-powerpc64-smp  4.2.0-30.36~14.04.1

After a standard system update you need to reboot your computer to make
all the necessary changes.

References

https://ubuntu.com/security/notices/USN-2908-5

https://ubuntu.com/security/notices/USN-2908-1

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1548587

February 27, 2016

Topics%20covered

Topics Covered

security advisory denial of service ubuntu linux-lts-wily kernel regression graphics issue

Package Information

https://launchpad.net/ubuntu/+source/linux-lts-wily/4.2.0-30.36~14.04.1

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