USN-3469-1: Linux kernel vulnerabilities
Ubuntu Security Notice USN-3469-1
31st October, 2017
linux, linux-aws, linux-gke, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 16.04 LTS
Several security issues were fixed in the Linux kernel.
- linux - Linux kernel
- linux-aws - Linux kernel for Amazon Web Services (AWS) systems
- linux-gke - Linux kernel for Google Container Engine (GKE) systems
- linux-kvm - Linux kernel for cloud environments
- linux-raspi2 - Linux kernel for Raspberry Pi 2
- linux-snapdragon - Linux kernel for Snapdragon processors
Anthony Perard discovered that the Xen virtual block driver did not
properly initialize some data structures before passing them to user space.
A local attacker in a guest VM could use this to expose sensitive
information from the host OS or other guest VMs. (CVE-2017-10911)
Bo Zhang discovered that the netlink wireless configuration interface in
the Linux kernel did not properly validate attributes when handling certain
requests. A local attacker with the CAP_NET_ADMIN could use this to cause a
denial of service (system crash). (CVE-2017-12153)
It was discovered that the nested KVM implementation in the Linux
kernel in some situations did not properly prevent second level guests
from reading and writing the hardware CR8 register. A local attacker
in a guest could use this to cause a denial of service (system crash).
It was discovered that the key management subsystem in the Linux kernel
did not properly restrict key reads on negatively instantiated keys. A
local attacker could use this to cause a denial of service (system crash).
It was discovered that an integer overflow existed in the sysfs interface
for the QLogic 24xx+ series SCSI driver in the Linux kernel. A local
privileged attacker could use this to cause a denial of service (system
It was discovered that the ATI Radeon framebuffer driver in the Linux
kernel did not properly initialize a data structure returned to user space.
A local attacker could use this to expose sensitive information (kernel
Dave Chinner discovered that the XFS filesystem did not enforce that the
realtime inode flag was settable only on filesystems on a realtime device.
A local attacker could use this to cause a denial of service (system
ChunYu Wang discovered that the iSCSI transport implementation in the Linux
kernel did not properly validate data structures. A local attacker could
use this to cause a denial of service (system crash). (CVE-2017-14489)
It was discovered that the generic SCSI driver in the Linux kernel did not
properly initialize data returned to user space in some situations. A local
attacker could use this to expose sensitive information (kernel memory).
Dmitry Vyukov discovered that the Floating Point Unit (fpu) subsystem in
the Linux kernel did not properly handle attempts to set reserved bits in a
task's extended state (xstate) area. A local attacker could use this to
cause a denial of service (system crash). (CVE-2017-15537)
Pengfei Wang discovered that the Turtle Beach MultiSound audio device
driver in the Linux kernel contained race conditions when fetching
from the ring-buffer. A local attacker could use this to cause a
denial of service (infinite loop). (CVE-2017-9984, CVE-2017-9985)
The problem can be corrected by updating your system to the following package version:
- Ubuntu 16.04 LTS:
- linux-image-4.4.0-1009-kvm 4.4.0-1009.14
- linux-image-powerpc-e500mc 184.108.40.206.103
- linux-image-gke 220.127.116.113.34
- linux-image-4.4.0-98-powerpc64-smp 4.4.0-98.121
- linux-image-aws 18.104.22.1689.41
- linux-image-4.4.0-98-generic 4.4.0-98.121
- linux-image-snapdragon 22.214.171.1248.70
- linux-image-powerpc64-emb 126.96.36.199.103
- linux-image-powerpc64-smp 188.8.131.52.103
- linux-image-4.4.0-1033-gke 4.4.0-1033.33
- linux-image-powerpc-smp 184.108.40.206.103
- linux-image-generic 220.127.116.11.103
- linux-image-4.4.0-98-powerpc64-emb 4.4.0-98.121
- linux-image-4.4.0-98-powerpc-smp 4.4.0-98.121
- linux-image-4.4.0-1076-raspi2 4.4.0-1076.84
- linux-image-kvm 18.104.22.1689.9
- linux-image-raspi2 22.214.171.1246.76
- linux-image-4.4.0-98-generic-lpae 4.4.0-98.121
- linux-image-generic-lpae 126.96.36.199.103
- linux-image-4.4.0-1039-aws 4.4.0-1039.48
- linux-image-4.4.0-1078-snapdragon 4.4.0-1078.83
- linux-image-4.4.0-98-lowlatency 4.4.0-98.121
- linux-image-4.4.0-98-powerpc-e500mc 4.4.0-98.121
- linux-image-lowlatency 188.8.131.52.103
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.