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Ubuntu Security Notice USN-2646-2

Ubuntu Security Notice USN-2646-2
Posted Jun 21, 2015
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2646-2 - 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. 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. Various other issues were also addressed.

tags | advisory, kernel, local
systems | linux, ubuntu
SHA-256 | c7380d91baf0065b79685c232e5e5e2202d948f49edf549da8ad314856cd6ce3

Ubuntu Security Notice USN-2646-2

Change Mirror Download
==========================================================================
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

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 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.

References:
http://www.ubuntu.com/usn/usn-2646-2
http://www.ubuntu.com/usn/usn-2646-1
http://bugs.launchpad.net/bugs/1465998

Package Information:
https://launchpad.net/ubuntu/+source/linux/3.16.0-41.57


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