1. Ubuntu Security Notices
  2. USN-2640-2

USN-2640-2: Linux kernel regression

Publication date

21 June 2015

Overview

The system could be made to crash under certain conditions.

Releases

Packages

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.

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

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
12.04 precise 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

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References

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