USN-3160-1: Linux kernel vulnerabilities

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 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)

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.

References

CVE-2016-6213,

CVE-2016-7916



Source From: ubuntu.com.
Original article title: “USN-3160-1: Linux kernel vulnerabilities”.
This full article can be read at USN-3160-1: Linux kernel vulnerabilities.

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