[USN-3392-1] Linux kernel regression

[Steve Beattie]

==========================================================================
Ubuntu Security Notice USN-3392-1
August 16, 2017

linux, linux-aws, linux-gke, linux-raspi2, linux-snapdragon regression
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.04 LTS

Summary:

USN-3378-1 introduced a regression in the Linux kernel.

Software Description:
- 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:

USN-3378-1 fixed vulnerabilities in the Linux kernel. Unfortunately, a
regression was introduced that prevented conntrack from working
correctly in some situations. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

 Fan Wu and Shixiong Zhao discovered a race condition between inotify events
 and vfs rename operations in the Linux kernel. An unprivileged local
 attacker could use this to cause a denial of service (system crash) or
 execute arbitrary code. (CVE-2017-7533)

 It was discovered that the Linux kernel did not properly restrict
 RLIMIT_STACK size. A local attacker could use this in conjunction with
 another vulnerability to possibly execute arbitrary code.
 (CVE-2017-1000365)

 李强 discovered that the Virtio GPU driver in the Linux kernel did not
 properly free memory in some situations. A local attacker could use this to
 cause a denial of service (memory consumption). (CVE-2017-10810)

 石磊 discovered that the RxRPC Kerberos 5 ticket handling code in the
 Linux kernel did not properly verify metadata. A remote attacker could use
 this to cause a denial of service (system crash) or possibly execute
 arbitrary code. (CVE-2017-7482)

Update instructions:

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1027-gke      4.4.0-1027.27
  linux-image-4.4.0-1031-aws      4.4.0-1031.40
  linux-image-4.4.0-1070-raspi2   4.4.0-1070.78
  linux-image-4.4.0-1072-snapdragon  4.4.0-1072.77
  linux-image-4.4.0-92-generic    4.4.0-92.115
  linux-image-4.4.0-92-generic-lpae  4.4.0-92.115
  linux-image-4.4.0-92-lowlatency  4.4.0-92.115
  linux-image-4.4.0-92-powerpc-e500mc  4.4.0-92.115
  linux-image-4.4.0-92-powerpc-smp  4.4.0-92.115
  linux-image-4.4.0-92-powerpc64-emb  4.4.0-92.115
  linux-image-4.4.0-92-powerpc64-smp  4.4.0-92.115
  linux-image-aws                 4.4.0.1031.33
  linux-image-generic             4.4.0.92.97
  linux-image-generic-lpae        4.4.0.92.97
  linux-image-gke                 4.4.0.1027.28
  linux-image-lowlatency          4.4.0.92.97
  linux-image-powerpc-e500mc      4.4.0.92.97
  linux-image-powerpc-smp         4.4.0.92.97
  linux-image-powerpc64-emb       4.4.0.92.97
  linux-image-powerpc64-smp       4.4.0.92.97
  linux-image-raspi2              4.4.0.1070.70
  linux-image-snapdragon          4.4.0.1072.64

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:
  https://www.ubuntu.com/usn/usn-3392-1
  https://bugs.launchpad.net/bugs/1709032, https://usn.ubuntu.com/usn/usn-3378-1

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.4.0-92.115
  https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1031.40
  https://launchpad.net/ubuntu/+source/linux-gke/4.4.0-1027.27
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1070.78
  https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1072.77

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