USN-3797-2: Linux kernel (Xenial HWE) vulnerabilities

23 October 2018

linux-lts-xenial, linux-aws 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-aws - Linux kernel for Amazon Web Services (AWS) systems
  • linux-lts-xenial - Linux hardware enablement kernel from Xenial for Trusty

Details

USN-3797-1 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.

Noam Rathaus discovered that a use-after-free vulnerability existed in the Infiniband implementation in the Linux kernel. An attacker could use this to cause a denial of service (system crash). (CVE-2018-14734)

It was discovered that an integer overflow existed in the CD-ROM driver of the Linux kernel. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2018-16658)

It was discovered that a integer overflow existed in the HID Bluetooth implementation in the Linux kernel that could lead to a buffer overwrite. An attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2018-9363)

Yves Younan discovered that the CIPSO labeling implementation in the Linux kernel did not properly handle IP header options in some situations. A remote attacker could use this to specially craft network traffic that could cause a denial of service (infinite loop). (CVE-2018-10938)

Update instructions

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

Ubuntu 14.04 LTS
linux-image-4.4.0-1032-aws - 4.4.0-1032.35
linux-image-4.4.0-138-generic - 4.4.0-138.164~14.04.1
linux-image-4.4.0-138-generic-lpae - 4.4.0-138.164~14.04.1
linux-image-4.4.0-138-lowlatency - 4.4.0-138.164~14.04.1
linux-image-4.4.0-138-powerpc-e500mc - 4.4.0-138.164~14.04.1
linux-image-4.4.0-138-powerpc-smp - 4.4.0-138.164~14.04.1
linux-image-4.4.0-138-powerpc64-emb - 4.4.0-138.164~14.04.1
linux-image-4.4.0-138-powerpc64-smp - 4.4.0-138.164~14.04.1
linux-image-aws - 4.4.0.1032.32
linux-image-generic-lpae-lts-xenial - 4.4.0.138.118
linux-image-generic-lts-xenial - 4.4.0.138.118
linux-image-lowlatency-lts-xenial - 4.4.0.138.118
linux-image-powerpc-e500mc-lts-xenial - 4.4.0.138.118
linux-image-powerpc-smp-lts-xenial - 4.4.0.138.118
linux-image-powerpc64-emb-lts-xenial - 4.4.0.138.118
linux-image-powerpc64-smp-lts-xenial - 4.4.0.138.118

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