Ubuntu Security Notice USN-3160-1
20th December, 2016
linux vulnerabilities
A security issue affects these releases of Ubuntu and its
derivatives:
- Ubuntu 14.04 LTS
Summary
Several security issues were fixed in the kernel.
Software description
- linux
- Linux kernel
Details
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
crash). (CVE-2016-6213)
It was discovered that a race condition 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)
Update instructions
The problem can be corrected by updating your system to the following
package version:
- Ubuntu 14.04 LTS:
linux-image-powerpc-smp
3.13.0.106.114
linux-image-powerpc-e500mc
3.13.0.106.114
linux-image-3.13.0-106-powerpc64-emb
3.13.0-106.153
linux-image-3.13.0-106-lowlatency
3.13.0-106.153
linux-image-3.13.0-106-generic
3.13.0-106.153
linux-image-generic
3.13.0.106.114
linux-image-3.13.0-106-generic-lpae
3.13.0-106.153
linux-image-powerpc64-emb
3.13.0.106.114
linux-image-3.13.0-106-powerpc-e500mc
3.13.0-106.153
linux-image-3.13.0-106-powerpc-e500
3.13.0-106.153
linux-image-powerpc-e500
3.13.0.106.114
linux-image-powerpc64-smp
3.13.0.106.114
linux-image-generic-lpae
3.13.0.106.114
linux-image-3.13.0-106-powerpc-smp
3.13.0-106.153
linux-image-3.13.0-106-powerpc64-smp
3.13.0-106.153
linux-image-lowlatency
3.13.0.106.114
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.
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