[USN-2644-2] Linux kernel (Utopic HWE) regression

John Johansen john.johansen at canonical.com
Sun Jun 21 19:02:31 UTC 2015

Ubuntu Security Notice USN-2644-2
June 21, 2015

linux-lts-utopic regression

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

- Ubuntu 14.04 LTS


The system could be made to crash under certain conditions.

Software Description:
- linux-lts-utopic: Linux hardware enablement kernel from Utopic


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 14.04 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.


Package Information:

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 819 bytes
Desc: OpenPGP digital signature
URL: <https://lists.ubuntu.com/archives/ubuntu-security-announce/attachments/20150621/86eb2f19/attachment.sig>

More information about the ubuntu-security-announce mailing list