USN-3378-1: Linux kernel vulnerabilities

03 August 2017

Several security issues were fixed in the Linux kernel.

Releases

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

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

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.

Related notices

  • USN-3377-1: linux-image-4.10.0-1013-raspi2, linux-image-lowlatency, linux-image-generic-lpae, linux-raspi2, linux-image-4.10.0-30-generic-lpae, linux-image-raspi2, linux-image-4.10.0-30-generic, linux, linux-image-generic, linux-image-4.10.0-30-lowlatency
  • USN-3381-2: linux-image-3.13.0-126-generic, linux-image-generic-lts-trusty, linux-image-3.13.0-126-generic-lpae, linux-image-generic-lpae-lts-trusty, linux-lts-trusty
  • USN-3378-2: linux-image-powerpc-e500mc-lts-xenial, linux-image-powerpc-smp-lts-xenial, linux-lts-xenial, linux-image-4.4.0-89-generic, linux-image-4.4.0-89-powerpc64-smp, linux-image-lowlatency-lts-xenial, linux-image-4.4.0-89-generic-lpae, linux-image-powerpc64-smp-lts-xenial, linux-image-generic-lts-xenial, linux-image-powerpc64-emb-lts-xenial, linux-image-4.4.0-89-powerpc64-emb, linux-image-4.4.0-89-powerpc-e500mc, linux-image-generic-lpae-lts-xenial, linux-image-4.4.0-89-lowlatency, linux-image-4.4.0-89-powerpc-smp
  • USN-3377-2: linux-hwe, linux-image-4.10.0-30-generic-lpae, linux-image-lowlatency-hwe-16.04, linux-image-4.10.0-30-generic, linux-image-generic-hwe-16.04, linux-image-4.10.0-30-lowlatency, linux-image-generic-lpae-hwe-16.04
  • USN-3381-1: linux-image-3.13.0-126-lowlatency, linux-image-3.13.0-126-powerpc-e500mc, linux-image-lowlatency, linux-image-3.13.0-126-powerpc64-smp, linux-image-powerpc-e500mc, linux-image-generic-lpae, linux-image-powerpc64-smp, linux-image-3.13.0-126-powerpc64-emb, linux-image-3.13.0-126-generic, linux, linux-image-3.13.0-126-generic-lpae, linux-image-3.13.0-126-powerpc-smp, linux-image-generic, linux-image-powerpc64-emb, linux-image-powerpc-smp, linux-image-powerpc-e500, linux-image-3.13.0-126-powerpc-e500