Ubuntu Security Notice USN-2640-2
21st June, 2015
linux regression
A security issue affects these releases of Ubuntu and its
derivatives:
- Ubuntu 12.04 LTS
Summary
The system could be made to crash under certain conditions.
Software description
- linux
– Linux kernel
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.
Update instructions
The problem can be corrected by updating your system to the following
package version:
- Ubuntu 12.04 LTS:
-
linux-image-3.2.0-86-generic-pae
3.2.0-86.124
-
linux-image-3.2.0-86-powerpc64-smp
3.2.0-86.124
-
linux-image-3.2.0-86-generic
3.2.0-86.124
-
linux-image-3.2.0-86-virtual
3.2.0-86.124
-
linux-image-3.2.0-86-omap
3.2.0-86.124
-
linux-image-3.2.0-86-powerpc-smp
3.2.0-86.124
-
linux-image-3.2.0-86-highbank
3.2.0-86.124
To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.
After a standard system update you need to reboot your computer to make
all the necessary changes.