USN-4319-1: Linux kernel vulnerabilities

10 April 2020

Several security issues were fixed in the Linux kernel.

Releases

Packages

Details

It was discovered that the IPMI message handler implementation in the Linux
kernel did not properly deallocate memory in certain situations. A local
attacker could use this to cause a denial of service (kernel memory
exhaustion). (CVE-2019-19046)

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). (CVE-2020-8428)

Update instructions

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

Ubuntu 19.10
Ubuntu 18.04

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-4320-1: linux-image-4.4.0-177-generic-lpae, linux-image-generic-lpae-lts-utopic, linux-image-virtual-lts-vivid, linux-kvm, linux-image-aws, linux-image-generic, linux-image-powerpc64-emb-lts-utopic, linux-image-powerpc-smp-lts-vivid, linux-image-generic-lts-utopic, linux-image-powerpc64-emb-lts-xenial, linux-image-virtual-lts-xenial, linux-image-powerpc64-emb-lts-wily, linux-image-4.4.0-177-lowlatency, linux-image-4.4.0-177-powerpc-e500mc, linux-image-generic-lpae, linux-image-powerpc64-emb, linux-image-powerpc64-smp-lts-utopic, linux-image-powerpc-e500mc-lts-xenial, linux-image-powerpc-smp, linux-image-powerpc64-smp-lts-xenial, linux-raspi2, linux-image-generic-lts-vivid, linux, linux-image-generic-lpae-lts-vivid, linux-image-4.4.0-1105-aws, linux-image-snapdragon, linux-image-powerpc-e500mc-lts-wily, linux-image-virtual-lts-utopic, linux-image-4.4.0-1131-raspi2, linux-image-powerpc-smp-lts-xenial, linux-image-lowlatency-lts-vivid, linux-image-lowlatency-lts-xenial, linux-image-raspi2, linux-image-lowlatency-lts-wily, linux-image-powerpc-smp-lts-utopic, linux-lts-xenial, linux-image-4.4.0-1135-snapdragon, linux-image-virtual-lts-wily, linux-image-virtual, linux-aws, linux-image-4.4.0-1069-kvm, linux-image-generic-lpae-lts-xenial, linux-image-powerpc-e500mc, linux-image-generic-lpae-lts-wily, linux-image-4.4.0-177-powerpc-smp, linux-image-generic-lts-wily, linux-image-lowlatency-lts-utopic, linux-image-powerpc-smp-lts-wily, linux-image-generic-lts-xenial, linux-image-powerpc-e500mc-lts-utopic, linux-image-powerpc-e500mc-lts-vivid, linux-image-powerpc64-smp-lts-wily, linux-image-4.4.0-177-powerpc64-smp, linux-image-4.4.0-177-generic, linux-image-powerpc64-smp-lts-vivid, linux-image-powerpc64-emb-lts-vivid, linux-snapdragon, linux-image-lowlatency, linux-image-4.4.0-177-powerpc64-emb, linux-image-powerpc64-smp, linux-image-4.4.0-1065-aws, linux-image-kvm
  • USN-4318-1: linux-image-lowlatency-hwe-16.04-edge, linux-image-generic-lpae-hwe-16.04-edge, linux-image-generic-lpae, linux-image-oem, linux-image-generic-hwe-16.04-edge, linux-image-4.15.0-96-generic-lpae, linux-image-4.15.0-96-generic, linux, linux-hwe, linux-image-generic, linux-image-generic-hwe-16.04, linux-image-generic-lpae-hwe-16.04, linux-image-lowlatency, linux-image-virtual, linux-image-virtual-hwe-16.04, linux-image-virtual-hwe-16.04-edge, linux-image-lowlatency-hwe-16.04, linux-image-4.15.0-96-lowlatency
  • LSN-0065-1: generic-4.15, aws, gcp, lowlatency-4.15, lowlatency-4.4, generic-4.4, azure
  • USN-4302-1: linux-image-oem, linux-image-lowlatency-hwe-16.04, linux-kvm, linux-image-aws, linux-image-generic-hwe-16.04-edge, linux-image-generic, linux-image-oracle, linux-image-azure-edge, linux-image-lowlatency-hwe-16.04-edge, linux-image-4.15.0-1057-raspi2, linux-image-4.15.0-1074-azure, linux-image-generic-lpae-hwe-16.04-edge, linux-image-generic-lpae, linux-raspi2, linux-image-gke, linux-image-4.15.0-1075-azure, linux, linux-hwe, linux-image-snapdragon, linux-oem, linux-image-4.15.0-1058-gcp, linux-aws-hwe, linux-image-4.15.0-1035-oracle, linux-image-raspi2, linux-image-4.15.0-1056-kvm, linux-image-4.15.0-91-generic-lpae, linux-image-virtual, linux-aws, linux-image-virtual-hwe-16.04, linux-image-aws-hwe, linux-image-4.15.0-1055-gke, linux-image-4.15.0-1076-oem, linux-image-gke-4.15, linux-gke-4.15, linux-image-virtual-hwe-16.04-edge, linux-oracle, linux-image-4.15.0-91-lowlatency, linux-image-aws-lts-18.04, linux-image-oracle-lts-18.04, linux-image-gcp, linux-snapdragon, linux-image-generic-lpae-hwe-16.04, linux-image-lowlatency, linux-azure, linux-image-generic-hwe-16.04, linux-image-4.15.0-1063-aws, linux-image-4.15.0-1074-snapdragon, linux-image-4.15.0-91-generic, linux-image-kvm, linux-gcp, linux-image-azure
  • USN-4325-1: linux-image-oem-osp1, linux-oracle-5.0, linux-image-5.0.0-1014-oracle, linux-image-gke-5.0, linux-image-gcp, linux-oem-osp1, linux-gke-5.0, linux-image-5.0.0-1047-oem-osp1, linux-azure, linux-image-5.0.0-1034-gcp, linux-image-oracle, linux-image-5.0.0-1036-azure, linux-image-5.0.0-1033-gke, linux-gcp, linux-image-azure
  • USN-4324-1: linux-image-oem, linux-kvm, linux-image-aws, linux-image-4.15.0-1077-azure, linux-image-oracle, linux-image-azure-edge, linux-raspi2, linux-image-gke, linux-image-4.15.0-1065-aws, linux-image-snapdragon, linux-oem, linux-image-4.15.0-1058-kvm, linux-image-4.15.0-1057-gke, linux-aws-hwe, linux-image-raspi2, linux-aws, linux-image-aws-hwe, linux-image-4.15.0-1060-raspi2, linux-image-gke-4.15, linux-image-4.15.0-1037-oracle, linux-gke-4.15, linux-image-aws-lts-18.04, linux-image-oracle-lts-18.04, linux-image-4.15.0-1060-gcp, linux-image-gcp, linux-image-4.15.0-1076-snapdragon, linux-snapdragon, linux-azure, linux-image-4.15.0-1079-oem, linux-oracle, linux-image-kvm, linux-gcp, linux-image-azure