USN-3468-3: Linux kernel (GCP) vulnerabilities

Releases

• Ubuntu 16.04 ESM

Packages

• linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems

Details

It was discovered that the KVM subsystem in the Linux kernel did not
properly bound guest IRQs. A local attacker in a guest VM could use this to
cause a denial of service (host system crash). (CVE-2017-1000252)

It was discovered that the Flash-Friendly File System (f2fs) implementation
in the Linux kernel did not properly validate superblock metadata. A local
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2017-10663)

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)

It was discovered that a use-after-free vulnerability existed in the POSIX
message queue implementation in the Linux kernel. A local attacker could
use this to cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2017-11176)

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)

Update instructions

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

Ubuntu 16.04

• linux-image-4.10.0-1008-gcp - 4.10.0-1008.8

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-2017-1000252
• CVE-2017-10663
• CVE-2017-10911
• CVE-2017-11176
• CVE-2017-14340

Related notices

• USN-3468-2: linux-image-extra-4.10.0-38-generic, linux-image-4.10.0-38-generic-lpae, linux-image-4.10.0-38-generic, linux-image-4.10.0-38-lowlatency, linux-hwe
• USN-3468-1: linux, linux-image-lowlatency, linux-image-raspi2, linux-image-4.10.0-38-generic-lpae, linux-image-4.10.0-38-generic, linux-image-generic, linux-raspi2, linux-image-4.10.0-1020-raspi2, linux-image-4.10.0-38-lowlatency, linux-image-generic-lpae
• USN-3420-1: linux-image-4.4.0-96-powerpc-e500mc, linux-image-4.4.0-96-lowlatency, linux, linux-image-4.4.0-96-powerpc64-smp, linux-raspi2, linux-kvm, linux-gke, linux-image-4.4.0-96-powerpc64-emb, linux-image-4.4.0-1035-aws, linux-image-extra-4.4.0-1031-gke, linux-image-4.4.0-96-powerpc-smp, linux-image-4.4.0-1031-gke, linux-snapdragon, linux-image-4.4.0-96-generic-lpae, linux-image-extra-4.4.0-96-generic, linux-aws, linux-image-4.4.0-1007-kvm, linux-image-4.4.0-96-generic, linux-image-4.4.0-1074-raspi2, linux-image-4.4.0-1076-snapdragon
• USN-3420-2: linux-image-4.4.0-96-generic-lpae, linux-image-extra-4.4.0-96-generic, linux-image-4.4.0-96-powerpc64-emb, linux-image-4.4.0-96-generic, linux-image-4.4.0-96-powerpc-e500mc, linux-image-4.4.0-96-powerpc64-smp, linux-lts-xenial, linux-image-4.4.0-96-lowlatency, linux-image-4.4.0-96-powerpc-smp
• USN-3470-2: linux-lts-trusty, linux-image-3.13.0-135-generic, linux-image-3.13.0-135-generic-lpae, linux-image-generic-lts-trusty, linux-image-generic-lpae-lts-trusty
• USN-3470-1: linux, linux-image-3.13.0-135-powerpc64-smp, linux-image-extra-3.13.0-135-generic, linux-image-3.13.0-135-powerpc64-emb, linux-image-3.13.0-135-generic, linux-image-3.13.0-135-powerpc-e500mc, linux-image-3.13.0-135-powerpc-smp, linux-image-3.13.0-135-generic-lpae, linux-image-3.13.0-135-powerpc-e500, linux-image-3.13.0-135-lowlatency
• USN-3414-1: qemu-user, qemu-kvm, qemu-keymaps, qemu-system-aarch64, qemu-system-mips, qemu-user-binfmt, qemu-guest-agent, qemu-block-extra, qemu-system-x86, qemu-system-ppc, qemu-system-arm, qemu-system-common, qemu-utils, qemu, qemu-common, qemu-system-misc, qemu-system-s390x, qemu-user-static, qemu-system-sparc, qemu-system
• USN-3469-1: linux-image-4.4.0-98-powerpc-smp, linux-image-4.4.0-98-generic, linux-image-4.4.0-98-powerpc64-smp, linux-image-4.4.0-1076-raspi2, linux-image-4.4.0-1009-kvm, linux-image-4.4.0-98-generic-lpae, linux-image-4.4.0-1039-aws, linux, linux-image-4.4.0-98-powerpc64-emb, linux-raspi2, linux-kvm, linux-image-4.4.0-98-powerpc-e500mc, linux-gke, linux-image-4.4.0-98-lowlatency, linux-snapdragon, linux-image-extra-4.4.0-98-generic, linux-image-extra-4.4.0-1033-gke, linux-aws, linux-image-4.4.0-1078-snapdragon, linux-image-4.4.0-1033-gke
• USN-3469-2: linux-image-extra-4.4.0-98-generic, linux-image-4.4.0-98-powerpc-smp, linux-image-4.4.0-98-generic, linux-image-4.4.0-98-powerpc64-smp, linux-image-4.4.0-98-powerpc64-emb, linux-image-4.4.0-98-generic-lpae, linux-lts-xenial, linux-image-4.4.0-98-powerpc-e500mc, linux-image-4.4.0-98-lowlatency
• USN-3405-1: linux-image-extra-4.4.0-1028-gke, linux, linux-image-4.4.0-93-powerpc64-smp, linux-image-4.4.0-1028-gke, linux-aws, linux-gke, linux-image-4.4.0-93-powerpc-smp, linux-image-4.4.0-1073-snapdragon, linux-image-4.4.0-93-generic, linux-image-4.4.0-1071-raspi2, linux-image-4.4.0-93-lowlatency, linux-raspi2, linux-snapdragon, linux-image-4.4.0-93-powerpc64-emb, linux-image-4.4.0-93-generic-lpae, linux-image-4.4.0-1032-aws, linux-image-4.4.0-93-powerpc-e500mc, linux-image-extra-4.4.0-93-generic
• USN-3405-2: linux-image-4.4.0-93-powerpc64-smp, linux-image-4.4.0-93-powerpc-smp, linux-image-4.4.0-93-generic, linux-image-4.4.0-93-lowlatency, linux-lts-xenial, linux-image-4.4.0-93-powerpc64-emb, linux-image-4.4.0-93-generic-lpae, linux-image-extra-4.4.0-93-generic, linux-image-4.4.0-93-powerpc-e500mc