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Ubuntu 14.04 LTS USN-2644-3 Critical Kernel Failure Due to Regression Bug

ubuntu
Calendar Grey June 21, 2015
Dist Ubuntu Esm H88
Ubuntu Security Announcement USN-2644-2 addresses a regression problem that resulted in system failures caused by kernel panic.
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-utopic: Linux hardware enablement kernel from Utopic

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 kernel ubuntu system crash file system administrative access regression

Update Instructions

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

Ubuntu 14.04 LTS:
  linux-image-3.16.0-41-generic   3.16.0-41.57~14.04.1
  linux-image-3.16.0-41-generic-lpae  3.16.0-41.57~14.04.1
  linux-image-3.16.0-41-lowlatency  3.16.0-41.57~14.04.1
  linux-image-3.16.0-41-powerpc-e500mc  3.16.0-41.57~14.04.1
  linux-image-3.16.0-41-powerpc-smp  3.16.0-41.57~14.04.1
  linux-image-3.16.0-41-powerpc64-emb  3.16.0-41.57~14.04.1
  linux-image-3.16.0-41-powerpc64-smp  3.16.0-41.57~14.04.1

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

References

https://ubuntu.com/security/notices/USN-2644-2

https://ubuntu.com/security/notices/USN-2644-1

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

Severity
critical
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Critical

June 21, 2015

Topics%20covered

Topics Covered

security advisory kernel ubuntu system crash file system administrative access regression

Package Information

https://launchpad.net/ubuntu/+source/linux-lts-utopic/3.16.0-41.57~14.04.1

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