USN-3265-1: 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-raspi2 - Linux kernel for Raspberry Pi 2
• linux-snapdragon - Linux kernel for Snapdragon Processors

Details

It was discovered that a use-after-free flaw existed in the filesystem
encryption subsystem in the Linux kernel. A local attacker could use this
to cause a denial of service (system crash). (CVE-2017-7374)

Andrey Konovalov discovered an out-of-bounds access in the IPv6 Generic
Routing Encapsulation (GRE) tunneling implementation in the Linux kernel.
An attacker could use this to possibly expose sensitive information.
(CVE-2017-5897)

Andrey Konovalov discovered that the IPv4 implementation in the Linux
kernel did not properly handle invalid IP options in some situations. An
attacker could use this to cause a denial of service or possibly execute
arbitrary code. (CVE-2017-5970)

Gareth Evans discovered that the shm IPC subsystem in the Linux kernel did
not properly restrict mapping page zero. A local privileged attacker could
use this to execute arbitrary code. (CVE-2017-5669)

Alexander Popov discovered that a race condition existed in the Stream
Control Transmission Protocol (SCTP) implementation in the Linux kernel. A
local attacker could use this to cause a denial of service (system crash).
(CVE-2017-5986)

Dmitry Vyukov discovered that the Linux kernel did not properly handle TCP
packets with the URG flag. A remote attacker could use this to cause a
denial of service. (CVE-2017-6214)

Andrey Konovalov discovered that the LLC subsytem in the Linux kernel did
not properly set up a destructor in certain situations. A local attacker
could use this to cause a denial of service (system crash). (CVE-2017-6345)

It was discovered that a race condition existed in the AF_PACKET handling
code in the Linux kernel. A local attacker could use this to cause a denial
of service (system crash) or possibly execute arbitrary code.
(CVE-2017-6346)

Andrey Konovalov discovered that the IP layer in the Linux kernel made
improper assumptions about internal data layout when performing checksums.
A local attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2017-6347)

Dmitry Vyukov discovered race conditions in the Infrared (IrDA) subsystem
in the Linux kernel. A local attacker could use this to cause a denial of
service (deadlock). (CVE-2017-6348)

Update instructions

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

Ubuntu 16.04

• linux-image-4.4.0-1012-gke - 4.4.0-1012.12
• linux-image-4.4.0-1016-aws - 4.4.0-1016.25
• linux-image-4.4.0-1054-raspi2 - 4.4.0-1054.61
• linux-image-4.4.0-1057-snapdragon - 4.4.0-1057.61
• linux-image-4.4.0-75-generic - 4.4.0-75.96
• linux-image-4.4.0-75-generic-lpae - 4.4.0-75.96
• linux-image-4.4.0-75-lowlatency - 4.4.0-75.96
• linux-image-4.4.0-75-powerpc-e500mc - 4.4.0-75.96
• linux-image-4.4.0-75-powerpc-smp - 4.4.0-75.96
• linux-image-4.4.0-75-powerpc64-smp - 4.4.0-75.96

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-2017-5669
• CVE-2017-5897
• CVE-2017-5970
• CVE-2017-5986
• CVE-2017-6214
• CVE-2017-6345
• CVE-2017-6346
• CVE-2017-6347
• CVE-2017-6348
• CVE-2017-7374

Related notices

• 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-3361-1: linux-image-extra-4.10.0-27-generic, linux-hwe, linux-image-4.10.0-27-lowlatency, linux-image-4.10.0-27-generic, linux-image-4.10.0-27-generic-lpae
• USN-3265-2: linux-image-4.4.0-75-generic-lpae, linux-image-4.4.0-75-lowlatency, linux-image-4.4.0-75-generic, linux-image-4.4.0-75-powerpc64-smp, linux-image-extra-4.4.0-75-generic, linux-image-4.4.0-75-powerpc-e500mc, linux-image-4.4.0-75-powerpc-smp, linux-lts-xenial, linux-image-4.4.0-75-powerpc64-emb
• 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-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
• USN-3422-2: linux-image-3.13.0-132-generic-lpae, linux-image-generic-lpae-lts-trusty, linux-lts-trusty, linux-image-generic-lts-trusty, linux-image-3.13.0-132-generic
• USN-3422-1: linux-image-3.13.0-132-powerpc64-emb, linux-image-3.13.0-132-lowlatency, linux-image-3.13.0-132-powerpc-smp, linux-image-3.13.0-132-powerpc-e500mc, linux-image-3.13.0-132-generic-lpae, linux-image-extra-3.13.0-132-generic, linux-image-3.13.0-132-powerpc64-smp, linux, linux-image-3.13.0-132-powerpc-e500, linux-image-3.13.0-132-generic
• USN-3264-1: linux-image-3.13.0-117-powerpc-smp, linux-image-extra-3.13.0-117-generic, linux-image-3.13.0-117-generic-lpae, linux-image-3.13.0-117-powerpc64-emb, linux-image-3.13.0-117-powerpc-e500, linux-image-3.13.0-117-powerpc64-smp, linux-image-3.13.0-117-generic, linux, linux-image-3.13.0-117-lowlatency, linux-image-3.13.0-117-powerpc-e500mc
• USN-3264-2: linux-image-3.13.0-117-generic-lpae, linux-image-generic-lpae-lts-trusty, linux-image-3.13.0-117-generic, linux-image-generic-lts-trusty, linux-lts-trusty
• USN-3266-1: linux-raspi2, linux-image-generic, linux-image-4.8.0-49-powerpc-e500mc, linux-image-powerpc-smp, linux-image-lowlatency, linux-image-4.8.0-1035-raspi2, linux-image-raspi2, linux-image-4.8.0-49-generic-lpae, linux-image-generic-lpae, linux, linux-image-4.8.0-49-powerpc-smp, linux-image-powerpc-e500mc, linux-image-4.8.0-49-generic, linux-image-4.8.0-49-lowlatency
• USN-3266-2: linux-image-extra-4.8.0-49-generic, linux-image-4.8.0-49-generic-lpae, linux-hwe, linux-image-4.8.0-49-generic, linux-image-4.8.0-49-lowlatency
• USN-3342-2: linux-image-4.8.0-58-lowlatency, linux-image-4.8.0-58-generic, linux-image-extra-4.8.0-58-generic, linux-hwe, linux-image-4.8.0-58-generic-lpae
• USN-3342-1: linux-image-4.8.0-58-lowlatency, linux-image-4.8.0-1042-raspi2, linux-image-4.8.0-58-generic, linux-image-4.8.0-58-powerpc64-emb, linux-image-generic, linux-raspi2, linux-image-powerpc-smp, linux-image-lowlatency, linux-image-powerpc64-smp, linux-image-4.8.0-58-powerpc-smp, linux-image-raspi2, linux-image-generic-lpae, linux, linux-image-4.8.0-58-powerpc-e500mc, linux-image-powerpc-e500mc, linux-image-virtual, linux-image-4.8.0-58-generic-lpae, linux-image-powerpc64-emb