USN-3084-1: Linux kernel vulnerabilities
Ubuntu Security Notice USN-3084-1
19th September, 2016
linux vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 16.04 LTS
Summary
Several security issues were fixed in the kernel.
Software description
- linux - Linux kernel
Details
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 version:
- Ubuntu 16.04 LTS:
- 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
- linux-image-4.4.0-38-generic 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-lowlatency 4.4.0-38.57
- linux-image-4.4.0-38-generic-lpae 4.4.0-38.57
To update your system, please follow these instructions: http://ift.tt/17VXqjU.
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
CVE-2016-5412, CVE-2016-6136, CVE-2016-6156
from Ubuntu Security Notices http://ift.tt/2cCRLqO