USN-3084-1: Linux kernel vulnerabilities

19 September 2016

linux vulnerabilities

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

  • Ubuntu 16.04 LTS


Several security issues were fixed in the kernel.

Software Description

  • linux - Linux kernel


Pengfei Wang discovered a race condition in the audit subsystem in the Linux kernel. A local attacker could use this to corrupt audit logs or disrupt system-call auditing. (CVE-2016-6136)

It was discovered that the powerpc and powerpc64 hypervisor-mode KVM implementation in the Linux kernel for did not properly maintain state about transactional memory. An unprivileged attacker in a guest could cause a denial of service (CPU lockup) in the host OS. (CVE-2016-5412)

Pengfei Wang discovered a race condition in the Chrome OS embedded controller device driver in the Linux kernel. A local attacker could use this to cause a denial of service (system crash). (CVE-2016-6156)

Update instructions

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

Ubuntu 16.04 LTS
linux-image-4.4.0-38-generic - 4.4.0-38.57
linux-image-4.4.0-38-generic-lpae - 4.4.0-38.57
linux-image-4.4.0-38-lowlatency - 4.4.0-38.57
linux-image-4.4.0-38-powerpc-e500mc - 4.4.0-38.57
linux-image-4.4.0-38-powerpc-smp - 4.4.0-38.57
linux-image-4.4.0-38-powerpc64-emb - 4.4.0-38.57
linux-image-4.4.0-38-powerpc64-smp - 4.4.0-38.57

To update your system, please follow these instructions:

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.