USN-4320-1: Linux kernel vulnerability

06 April 2020

The system could be made to crash or expose sensitive information.

Releases

Packages

  • linux - Linux kernel
  • linux-aws - Linux kernel for Amazon Web Services (AWS) systems
  • linux-kvm - Linux kernel for cloud environments
  • linux-lts-xenial - Linux hardware enablement kernel from Xenial for Trusty
  • linux-raspi2 - Linux kernel for Raspberry Pi 2
  • linux-snapdragon - Linux kernel for Snapdragon processors

Details

Al Viro discovered that the vfs layer in the Linux kernel contained a use-
after-free vulnerability. A local attacker could use this to cause a denial
of service (system crash) or possibly expose sensitive information (kernel
memory).

Update instructions

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

Ubuntu 16.04
Ubuntu 14.04

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.

References

Related notices

  • USN-4318-1: linux, linux-image-generic-hwe-16.04, linux-image-generic, linux-image-powerpc-smp, linux-image-generic-lpae-hwe-16.04, linux-image-lowlatency-hwe-16.04, linux-image-powerpc64-smp, linux-hwe, linux-image-lowlatency, linux-image-oem, linux-image-powerpc-e500mc, linux-image-virtual, linux-image-4.15.0-96-lowlatency, linux-image-virtual-hwe-16.04, linux-image-generic-lpae, linux-image-4.15.0-96-generic, linux-image-powerpc64-emb, linux-image-4.15.0-96-generic-lpae
  • USN-4319-1: linux-image-5.3.0-46-snapdragon, linux-image-azure, linux-image-azure-edge, linux-image-lowlatency, linux-azure-5.3, linux-image-5.3.0-1019-azure, linux-gcp-5.3, linux-aws, linux-image-oracle, linux, linux-image-snapdragon-hwe-18.04, linux-image-gcp, linux-image-5.3.0-46-generic, linux-image-aws, linux-raspi2-5.3, linux-image-generic-lpae, linux-image-virtual-hwe-18.04, linux-azure, linux-image-kvm, linux-image-5.3.0-1016-aws, linux-image-raspi2, linux-image-5.3.0-46-generic-lpae, linux-oracle, linux-image-5.3.0-1017-gcp, linux-image-snapdragon, linux-image-5.3.0-1015-kvm, linux-kvm, linux-gcp, linux-image-generic-lpae-hwe-18.04, linux-image-raspi2-hwe-18.04, linux-oracle-5.3, linux-image-generic-hwe-18.04, linux-raspi2, linux-image-5.3.0-1022-raspi2, linux-image-generic, linux-image-virtual, linux-hwe, linux-image-oracle-edge, linux-image-gcp-edge, linux-image-gke, linux-image-lowlatency-hwe-18.04, linux-image-5.3.0-46-lowlatency, linux-image-5.3.0-1014-oracle
  • USN-4324-1: linux-image-4.15.0-1060-gcp, linux-image-azure, linux-image-aws-lts-18.04, linux-image-azure-edge, linux-aws, linux-image-oracle, linux-oem, linux-gke-4.15, linux-image-gcp, linux-image-gke-4.15, linux-image-aws, linux-image-4.15.0-1058-kvm, linux-image-oem, linux-aws-hwe, linux-image-aws-hwe, linux-azure, linux-snapdragon, linux-image-4.15.0-1057-gke, linux-image-kvm, linux-image-4.15.0-1077-azure, linux-image-raspi2, linux-image-4.15.0-1076-snapdragon, linux-oracle, linux-image-oracle-lts-18.04, linux-image-snapdragon, linux-kvm, linux-image-4.15.0-1065-aws, linux-gcp, linux-image-4.15.0-1079-oem, linux-raspi2, linux-image-gke, linux-image-4.15.0-1037-oracle, linux-image-4.15.0-1060-raspi2
  • USN-4325-1: linux-azure, linux-image-5.0.0-1047-oem-osp1, linux-image-gke-5.0, linux-image-oracle, linux-oem-osp1, linux-image-gcp, linux-gke-5.0, linux-image-azure, linux-oracle-5.0, linux-image-5.0.0-1014-oracle, linux-image-5.0.0-1036-azure, linux-image-oem-osp1, linux-image-5.0.0-1034-gcp, linux-gcp, linux-image-5.0.0-1033-gke