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Ubuntu 12.04 LTS USN-2642-2: Critical Regression Crash Issue

ubuntu
Calendar Grey June 21, 2015
Dist Ubuntu Esm H88
Ubuntu 12.04 LTS experienced a significant bug leading to system failures; revised guidelines are now available for users to alleviate the issue.
The system could be made to crash under certain conditions.

Summary

The system could be made to crash under certain conditions.

Software Description:

- linux-lts-trusty: Linux hardware enablement kernel from Trusty

Details:

The Fix for CVE-2015-1328 introduced a regression into the Linux kernel's

overlayfs file system. The removal of a directory that only exists on the

lower layer results in a kernel panic.

We apologize for the inconvenience.

Original advisory details:

Philip Pettersson discovered a privilege escalation when using overlayfs

mounts inside of user namespaces. A local user could exploit this flaw to

gain administrative privileges on the system.

Topics%20covered

Topics Covered

security advisory privilege escalation ubuntu regression fix kernel crash overlayfs issue

Update Instructions

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

Ubuntu 12.04 LTS:
  linux-image-3.13.0-55-generic   3.13.0-55.94~precise1
  linux-image-3.13.0-55-generic-lpae  3.13.0-55.94~precise1

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

References

https://ubuntu.com/security/notices/USN-2642-2

https://ubuntu.com/security/notices/USN-2642-1

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1465998

Severity
critical
Lowest
Low
Medium
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Critical

June 21, 2015

Topics%20covered

Topics Covered

security advisory privilege escalation ubuntu regression fix kernel crash overlayfs issue

Package Information

https://launchpad.net/ubuntu/+source/linux-lts-trusty/3.13.0-55.94~precise1

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