9.3 - USN-3206-1

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 12.04 LTS

Summary:

Several security issues were fixed in the kernel.

Software Description: - linux: Linux kernel - linux-ti-omap4: Linux kernel for OMAP4

Details:

It was discovered that a use-after-free vulnerability existed in the block device layer of the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly gain administrative privileges. (CVE-2016-7910)

Dmitry Vyukov discovered a use-after-free vulnerability in the sys_ioprio_get() function in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly gain administrative privileges. (CVE-2016-7911)

Andrey Konovalov discovered a use-after-free vulnerability in the DCCP implementation in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly gain administrative privileges. (CVE-2017-6074)

Update instructions:

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

Ubuntu 12.04 LTS:
linux-image-3.2.0-123-generic 3.2.0-123.166
linux-image-3.2.0-123-generic-pae 3.2.0-123.166
linux-image-3.2.0-123-highbank 3.2.0-123.166
linux-image-3.2.0-123-omap 3.2.0-123.166
linux-image-3.2.0-123-powerpc-smp 3.2.0-123.166
linux-image-3.2.0-123-powerpc64-smp 3.2.0-123.166
linux-image-3.2.0-123-virtual 3.2.0-123.166
linux-image-3.2.0-1501-omap4 3.2.0-1501.128
linux-image-generic 3.2.0.123.138
linux-image-generic-pae 3.2.0.123.138
linux-image-highbank 3.2.0.123.138
linux-image-omap 3.2.0.123.138
linux-image-omap4 3.2.0.1501.96
linux-image-powerpc-smp 3.2.0.123.138
linux-image-powerpc64-smp 3.2.0.123.138
linux-image-virtual 3.2.0.123.138

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:
http://www.ubuntu.com/usn/usn-3206-1
CVE-2016-7910, CVE-2016-7911, CVE-2017-6074

Package Information:
https://launchpad.net/ubuntu/+source/linux/3.2.0-123.166
https://launchpad.net/ubuntu/+source/linux-ti-omap4/3.2.0-1501.128