[USN-2646-2] Linux kernel regression

John Johansen john.johansen at canonical.com
Sun Jun 21 19:03:02 UTC 2015

Ubuntu Security Notice USN-2646-2
June 21, 2015

linux regression

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 14.10


The system could be made to crash under certain conditions.

Software Description:
- linux: Linux kernel


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.

Update instructions:

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

Ubuntu 14.10:
  linux-image-3.16.0-41-generic   3.16.0-41.57
  linux-image-3.16.0-41-generic-lpae  3.16.0-41.57
  linux-image-3.16.0-41-lowlatency  3.16.0-41.57
  linux-image-3.16.0-41-powerpc-e500mc  3.16.0-41.57
  linux-image-3.16.0-41-powerpc-smp  3.16.0-41.57
  linux-image-3.16.0-41-powerpc64-emb  3.16.0-41.57
  linux-image-3.16.0-41-powerpc64-smp  3.16.0-41.57

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


Package Information:

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