[USN-2641-2] Linux kernel (OMAP4) regression

John Johansen john.johansen at canonical.com
Sun Jun 21 19:00:59 UTC 2015

Ubuntu Security Notice USN-2641-2
June 21, 2015

linux-ti-omap4 regression

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

- Ubuntu 12.04 LTS


The system could be made to crash under certain conditions.

Software Description:
- linux-ti-omap4: Linux kernel for OMAP4


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 12.04 LTS:
  linux-image-3.2.0-1466-omap4    3.2.0-1466.87

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


Package Information:

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