USN-3469-1: Linux kernel vulnerabilities

Releases

• Ubuntu 16.04 ESM

Packages

• 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

Details

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).
(CVE-2017-12192)

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
crash). (CVE-2017-14051)

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
memory). (CVE-2017-14156)

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
crash). (CVE-2017-14340)

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).
(CVE-2017-14991)

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)

Update instructions

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

Ubuntu 16.04

• linux-image-4.4.0-1009-kvm - 4.4.0-1009.14
• linux-image-4.4.0-1033-gke - 4.4.0-1033.33
• linux-image-4.4.0-1039-aws - 4.4.0-1039.48
• linux-image-4.4.0-1076-raspi2 - 4.4.0-1076.84
• linux-image-4.4.0-1078-snapdragon - 4.4.0-1078.83
• linux-image-4.4.0-98-generic - 4.4.0-98.121
• linux-image-4.4.0-98-generic-lpae - 4.4.0-98.121
• 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-4.4.0-98-powerpc-smp - 4.4.0-98.121
• linux-image-4.4.0-98-powerpc64-emb - 4.4.0-98.121
• linux-image-4.4.0-98-powerpc64-smp - 4.4.0-98.121

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-2017-10911
• CVE-2017-12153
• CVE-2017-12154
• CVE-2017-12192
• CVE-2017-14051
• CVE-2017-14156
• CVE-2017-14340
• CVE-2017-14489
• CVE-2017-14991
• CVE-2017-15537
• CVE-2017-9984
• CVE-2017-9985

Related notices

• USN-3414-1: qemu-system, qemu-system-s390x, qemu-user, qemu-keymaps, qemu, qemu-system-sparc, qemu-system-x86, qemu-common, qemu-system-common, qemu-system-aarch64, qemu-system-misc, qemu-system-ppc, qemu-block-extra, qemu-kvm, qemu-user-binfmt, qemu-system-mips, qemu-utils, qemu-system-arm, qemu-user-static, qemu-guest-agent
• USN-3468-2: linux-image-4.10.0-38-generic-lpae, linux-image-extra-4.10.0-38-generic, linux-image-4.10.0-38-generic, linux-hwe, linux-image-4.10.0-38-lowlatency
• USN-3468-3: linux-gcp, linux-image-extra-4.10.0-1008-gcp, linux-image-4.10.0-1008-gcp
• USN-3469-2: linux-image-4.4.0-98-lowlatency, linux-image-4.4.0-98-powerpc-e500mc, linux-image-4.4.0-98-generic-lpae, linux-image-4.4.0-98-powerpc64-emb, linux-image-extra-4.4.0-98-generic, linux-image-4.4.0-98-powerpc-smp, linux-image-4.4.0-98-powerpc64-smp, linux-lts-xenial, linux-image-4.4.0-98-generic
• USN-3470-2: linux-image-3.13.0-135-generic-lpae, linux-image-3.13.0-135-generic, linux-image-generic-lpae-lts-trusty, linux-lts-trusty, linux-image-generic-lts-trusty
• USN-3470-1: linux-image-3.13.0-135-generic-lpae, linux-image-3.13.0-135-powerpc-e500mc, linux-image-3.13.0-135-powerpc-smp, linux-image-extra-3.13.0-135-generic, linux-image-3.13.0-135-generic, linux-image-3.13.0-135-powerpc64-emb, linux, linux-image-3.13.0-135-powerpc64-smp, linux-image-3.13.0-135-lowlatency, linux-image-3.13.0-135-powerpc-e500
• USN-3468-1: linux-raspi2, linux-image-4.10.0-38-generic-lpae, linux-image-4.10.0-1020-raspi2, linux-image-lowlatency, linux-image-raspi2, linux-image-generic-lpae, linux-image-4.10.0-38-generic, linux, linux-image-generic, linux-image-4.10.0-38-lowlatency
• USN-3487-1: linux-raspi2, linux-image-generic, linux-image-4.13.0-17-generic-lpae, linux-image-lowlatency, linux-image-raspi2, linux-image-generic-lpae, linux, linux-image-4.13.0-1006-raspi2, linux-image-4.13.0-17-lowlatency, linux-image-4.13.0-17-generic
• USN-3583-2: linux-image-generic-lpae-lts-trusty, linux-image-3.13.0-142-generic, linux-lts-trusty, linux-image-generic-lts-trusty, linux-image-3.13.0-142-generic-lpae
• USN-3583-1: linux-image-3.13.0-142-powerpc-smp, linux-image-3.13.0-142-powerpc64-smp, linux-image-3.13.0-142-powerpc-e500, linux-image-3.13.0-142-powerpc-e500mc, linux-image-3.13.0-142-generic, linux, linux-image-3.13.0-142-generic-lpae, linux-image-3.13.0-142-lowlatency, linux-image-extra-3.13.0-142-generic, linux-image-3.13.0-142-powerpc64-emb
• USN-3698-2: linux-image-3.13.0-153-generic-lpae, linux-image-generic-lpae-lts-trusty, linux-lts-trusty, linux-image-generic-lts-trusty, linux-image-3.13.0-153-generic
• USN-3698-1: linux-image-3.13.0-153-powerpc-e500, linux-image-3.13.0-153-generic-lpae, linux-image-3.13.0-153-lowlatency, linux-image-3.13.0-153-powerpc-e500mc, linux-image-3.13.0-153-powerpc-smp, linux, linux-image-3.13.0-153-powerpc64-smp, linux-image-3.13.0-153-generic, linux-image-3.13.0-153-powerpc64-emb, linux-image-extra-3.13.0-153-generic
• USN-3754-1: linux-image-3.13.0-157-powerpc-e500mc, linux-image-3.13.0-157-generic, linux-image-3.13.0-157-lowlatency, linux-image-3.13.0-157-powerpc64-emb, linux-image-extra-3.13.0-157-generic, linux-image-3.13.0-157-powerpc-e500, linux, linux-image-3.13.0-157-generic-lpae, linux-image-3.13.0-157-powerpc-smp, linux-image-3.13.0-157-powerpc64-smp