USN-3160-2: Linux kernel (Trusty HWE) vulnerabilities
Ubuntu Security Notice USN-3160-2
20th December, 2016
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 12.04 LTS
Several security issues were fixed in the kernel.
- linux-lts-trusty - Linux hardware enablement kernel from Trusty for Precise
USN-3160-1 fixed vulnerabilities in the Linux kernel for Ubuntu 14.04
LTS. This update provides the corresponding updates for the Linux
Hardware Enablement (HWE) kernel from Ubuntu 14.04 LTS for Ubuntu
CAI Qian discovered that shared bind mounts in a mount namespace
exponentially added entries without restriction to the Linux kernel's mount
table. A local attacker could use this to cause a denial of service (system
It was discovered that a race condition existed in the procfs
environ_read function in the Linux kernel, leading to an integer
underflow. A local attacker could use this to expose sensitive
information (kernel memory). (CVE-2016-7916)
The problem can be corrected by updating your system to the following package version:
- Ubuntu 12.04 LTS:
- linux-image-3.13.0-106-generic 3.13.0-106.153~precise1
- linux-image-generic-lpae-lts-trusty 18.104.22.168.97
- linux-image-3.13.0-106-generic-lpae 3.13.0-106.153~precise1
- linux-image-generic-lts-trusty 22.214.171.124.97
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.
ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.