USN-3084-1: Linux kernel vulnerabilities

19 September 2016

Several security issues were fixed in the 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

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.

Related notices

  • USN-3097-2: linux-ti-omap4, linux-image-3.2.0-1489-omap4
  • USN-3097-1: linux, linux-image-3.2.0-111-powerpc64-smp, linux-image-3.2.0-111-generic, linux-image-3.2.0-111-virtual, linux-image-3.2.0-111-powerpc-smp, linux-image-3.2.0-111-highbank, linux-image-3.2.0-111-generic-pae, linux-image-3.2.0-111-omap
  • USN-3098-1: linux, linux-image-3.13.0-98-powerpc64-emb, linux-image-3.13.0-98-generic, linux-image-3.13.0-98-powerpc-e500, linux-image-3.13.0-98-lowlatency, linux-image-3.13.0-98-powerpc-e500mc, linux-image-3.13.0-98-powerpc64-smp, linux-image-3.13.0-98-powerpc-smp, linux-image-extra-3.13.0-98-generic, linux-image-3.13.0-98-generic-lpae
  • USN-3084-2: linux-image-4.4.0-38-powerpc64-emb, linux-image-extra-4.4.0-38-generic, linux-lts-xenial, linux-image-4.4.0-38-powerpc-e500mc, linux-image-4.4.0-38-powerpc64-smp, linux-image-4.4.0-38-lowlatency, linux-image-4.4.0-38-powerpc-smp, linux-image-4.4.0-38-generic-lpae, linux-image-4.4.0-38-generic
  • USN-3098-2: linux-image-3.13.0-98-generic-lpae, linux-image-3.13.0-98-generic, linux-lts-trusty
  • USN-3084-3: linux-image-4.4.0-1023-raspi2, linux-raspi2
  • USN-3084-4: linux-image-4.4.0-1026-snapdragon, linux-snapdragon