USN-3420-2: Linux kernel (Xenial HWE) vulnerabilities

18 September 2017

linux-lts-xenial vulnerabilities

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

  • Ubuntu 14.04 LTS

Summary

Several security issues were fixed in the Linux kernel.

Software Description

  • linux-lts-xenial - Linux hardware enablement kernel from Xenial for Trusty

Details

USN-3420-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement (HWE) kernel from Ubuntu 16.04 LTS for Ubuntu 14.04 LTS.

It was discovered that a buffer overflow existed in the Bluetooth stack of the Linux kernel when handling L2CAP configuration responses. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2017-1000251)

It was discovered that the Flash-Friendly File System (f2fs) implementation in the Linux kernel did not properly validate superblock metadata. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2017-10663)

It was discovered that a buffer overflow existed in the ioctl handling code in the ISDN subsystem of the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2017-12762)

Pengfei Wang discovered that a race condition existed in the NXP SAA7164 TV Decoder driver for the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2017-8831)

Update instructions

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

Ubuntu 14.04 LTS
linux-image-4.4.0-96-generic - 4.4.0-96.119~14.04.1
linux-image-4.4.0-96-generic-lpae - 4.4.0-96.119~14.04.1
linux-image-4.4.0-96-lowlatency - 4.4.0-96.119~14.04.1
linux-image-4.4.0-96-powerpc-e500mc - 4.4.0-96.119~14.04.1
linux-image-4.4.0-96-powerpc-smp - 4.4.0-96.119~14.04.1
linux-image-4.4.0-96-powerpc64-emb - 4.4.0-96.119~14.04.1
linux-image-4.4.0-96-powerpc64-smp - 4.4.0-96.119~14.04.1
linux-image-generic-lpae-lts-xenial - 4.4.0.96.80
linux-image-generic-lts-xenial - 4.4.0.96.80
linux-image-lowlatency-lts-xenial - 4.4.0.96.80
linux-image-powerpc-e500mc-lts-xenial - 4.4.0.96.80
linux-image-powerpc-smp-lts-xenial - 4.4.0.96.80
linux-image-powerpc64-emb-lts-xenial - 4.4.0.96.80
linux-image-powerpc64-smp-lts-xenial - 4.4.0.96.80

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