7.2 - USN-3127-1

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:

It was discovered that the compression handling code in the Advanced Linux Sound Architecture (ALSA) subsystem in the Linux kernel did not properly check for an integer overflow. A local attacker could use this to cause a denial of service (system crash). (CVE-2014-9904)

Kirill A. Shutemov discovered that memory manager in the Linux kernel did not properly handle anonymous pages. A local attacker could use this to cause a denial of service or possibly gain administrative privileges. (CVE-2015-3288)

Vitaly Kuznetsov discovered that the Linux kernel did not properly suppress hugetlbfs support in X86 paravirtualized guests. An attacker in the guest OS could cause a denial of service (guest system crash). (CVE-2016-3961)

Ondrej Kozina discovered that the keyring interface in the Linux kernel contained a buffer overflow when displaying timeout events via the /proc/keys interface. A local attacker could use this to cause a denial of service (system crash). (CVE-2016-7042)

Update instructions:

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

Ubuntu 14.04 LTS:
linux-image-3.13.0-101-generic 3.13.0-101.148
linux-image-3.13.0-101-generic-lpae 3.13.0-101.148
linux-image-3.13.0-101-lowlatency 3.13.0-101.148
linux-image-3.13.0-101-powerpc-e500 3.13.0-101.148
linux-image-3.13.0-101-powerpc-e500mc 3.13.0-101.148
linux-image-3.13.0-101-powerpc-smp 3.13.0-101.148
linux-image-3.13.0-101-powerpc64-emb 3.13.0-101.148
linux-image-3.13.0-101-powerpc64-smp 3.13.0-101.148
linux-image-generic 3.13.0.101.109
linux-image-generic-lpae 3.13.0.101.109
linux-image-lowlatency 3.13.0.101.109
linux-image-powerpc-e500 3.13.0.101.109
linux-image-powerpc-e500mc 3.13.0.101.109
linux-image-powerpc-smp 3.13.0.101.109
linux-image-powerpc64-emb 3.13.0.101.109
linux-image-powerpc64-smp 3.13.0.101.109
linux-image-virtual 3.13.0.101.109

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-3127-1
CVE-2014-9904, CVE-2015-3288, CVE-2016-3961, CVE-2016-7042

Package Information:
https://launchpad.net/ubuntu/+source/linux/3.13.0-101.148