USN-4325-1: Linux kernel vulnerabilities

Releases

• Ubuntu 18.04 ESM

Packages

• linux-azure - Linux kernel for Microsoft Azure Cloud systems
• linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
• linux-gke-5.0 - Linux kernel for Google Container Engine (GKE) systems
• linux-oem-osp1 - Linux kernel for OEM processors
• linux-oracle-5.0 - Linux kernel for Oracle Cloud systems

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 18.04

• linux-image-5.0.0-1014-oracle - 5.0.0-1014.19
• linux-image-5.0.0-1033-gke - 5.0.0-1033.34
• linux-image-5.0.0-1034-gcp - 5.0.0-1034.35
• linux-image-5.0.0-1036-azure - 5.0.0-1036.38
• linux-image-5.0.0-1047-oem-osp1 - 5.0.0-1047.52
• linux-image-azure - 5.0.0.1035.46
• linux-image-gcp - 5.0.0.1033.37
• linux-image-gke-5.0 - 5.0.0.1032.20
• linux-image-oem-osp1 - 5.0.0.1043.48
• linux-image-oracle - 5.0.0.1013.14

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-2019-19046
• CVE-2020-8428

Related notices

• USN-4319-1: linux-oracle, linux-image-raspi2-hwe-18.04, linux-image-5.3.0-46-lowlatency, linux-image-generic-lpae-hwe-18.04, linux-image-generic, linux-image-5.3.0-1015-kvm, linux-image-lowlatency-hwe-18.04, linux-image-virtual, linux-oracle-5.3, linux-image-5.3.0-1022-raspi2, linux-image-5.3.0-1016-aws, linux-image-gcp, linux-image-generic-lpae-hwe-18.04-edge, linux-image-snapdragon-hwe-18.04, linux-azure-5.3, linux-image-oracle, linux-kvm, linux-image-5.3.0-46-generic-lpae, linux-image-oracle-edge, linux-aws, linux-image-5.3.0-46-generic, linux-image-aws, linux-image-5.3.0-1014-oracle, linux-image-generic-lpae, linux-raspi2, linux, linux-image-kvm, linux-image-lowlatency, linux-image-generic-hwe-18.04-edge, linux-image-raspi2, linux-image-azure, linux-image-5.3.0-1019-azure, linux-gcp-5.3, linux-image-snapdragon, linux-image-5.3.0-46-snapdragon, linux-image-azure-edge, linux-image-virtual-hwe-18.04-edge, linux-image-gcp-edge, linux-image-lowlatency-hwe-18.04-edge, linux-hwe, linux-image-gke, linux-image-generic-hwe-18.04, linux-image-virtual-hwe-18.04, linux-image-snapdragon-hwe-18.04-edge, linux-raspi2-5.3, linux-azure, linux-image-5.3.0-1017-gcp, linux-gcp
• USN-4302-1: linux-gke-4.15, linux-image-generic-lpae-hwe-16.04-edge, linux-image-lowlatency-hwe-16.04, linux-oracle, linux-aws-hwe, linux-image-generic, linux-image-oem, linux-image-virtual, linux-image-4.15.0-1074-snapdragon, linux-image-generic-hwe-16.04, linux-image-virtual-hwe-16.04, linux-image-4.15.0-91-generic-lpae, linux-image-4.15.0-1074-azure, linux-oem, linux-image-4.15.0-1055-gke, linux-image-4.15.0-1063-aws, linux-image-4.15.0-1057-raspi2, linux-image-gcp, linux-image-oracle, linux-image-4.15.0-1076-oem, linux-image-gke-4.15, linux-image-4.15.0-1056-kvm, linux-image-lowlatency-hwe-16.04-edge, linux-kvm, linux-image-4.15.0-91-lowlatency, linux-aws, linux-image-aws, linux-image-generic-lpae, linux-raspi2, linux-image-virtual-hwe-16.04-edge, linux, linux-image-4.15.0-1075-azure, linux-image-kvm, linux-image-lowlatency, linux-image-raspi2, linux-image-aws-hwe, linux-image-azure, linux-image-oracle-lts-18.04, linux-image-4.15.0-1058-gcp, linux-image-azure-edge, linux-image-snapdragon, linux-hwe, linux-image-aws-lts-18.04, linux-image-gke, linux-image-4.15.0-1035-oracle, linux-snapdragon, linux-image-generic-hwe-16.04-edge, linux-azure, linux-image-4.15.0-91-generic, linux-image-generic-lpae-hwe-16.04, linux-gcp
• USN-4320-1: linux-image-powerpc64-smp-lts-xenial, linux-image-4.4.0-1069-kvm, linux-image-generic, linux-image-generic-lpae-lts-utopic, linux-image-powerpc64-smp-lts-vivid, linux-image-virtual, linux-image-powerpc64-emb-lts-utopic, linux-image-generic-lts-vivid, linux-image-generic-lts-wily, linux-image-powerpc64-smp-lts-utopic, linux-image-4.4.0-1131-raspi2, linux-image-powerpc-smp-lts-utopic, linux-image-generic-lts-utopic, linux-kvm, linux-image-4.4.0-1105-aws, linux-image-lowlatency-lts-utopic, linux-image-powerpc64-smp, linux-lts-xenial, linux-image-powerpc-e500mc-lts-vivid, linux-image-4.4.0-177-generic-lpae, linux-image-lowlatency-lts-xenial, linux-aws, linux-image-powerpc-e500mc-lts-xenial, linux-image-aws, linux-image-generic-lpae, linux-raspi2, linux-image-lowlatency-lts-wily, linux-image-generic-lts-xenial, linux-image-4.4.0-1065-aws, linux-image-powerpc64-emb, linux, linux-image-kvm, linux-image-lowlatency, linux-image-powerpc-smp-lts-vivid, linux-image-4.4.0-177-lowlatency, linux-image-powerpc64-emb-lts-vivid, linux-image-powerpc64-emb-lts-xenial, linux-image-virtual-lts-xenial, linux-image-generic-lpae-lts-xenial, linux-image-raspi2, linux-image-virtual-lts-utopic, linux-image-powerpc-e500mc, linux-image-powerpc64-smp-lts-wily, linux-image-lowlatency-lts-vivid, linux-image-4.4.0-177-generic, linux-image-powerpc-e500mc-lts-wily, linux-image-4.4.0-177-powerpc64-emb, linux-image-powerpc-smp-lts-wily, linux-image-generic-lpae-lts-vivid, linux-image-4.4.0-1135-snapdragon, linux-image-snapdragon, linux-image-powerpc-e500mc-lts-utopic, linux-image-4.4.0-177-powerpc-smp, linux-image-generic-lpae-lts-wily, linux-image-powerpc-smp, linux-image-virtual-lts-vivid, linux-image-4.4.0-177-powerpc64-smp, linux-snapdragon, linux-image-powerpc-smp-lts-xenial, linux-image-virtual-lts-wily, linux-image-4.4.0-177-powerpc-e500mc, linux-image-powerpc64-emb-lts-wily
• USN-4324-1: linux-gke-4.15, linux-image-4.15.0-1057-gke, linux-oracle, linux-aws-hwe, linux-image-oem, linux-image-4.15.0-1037-oracle, linux-image-4.15.0-1060-raspi2, linux-image-4.15.0-1065-aws, linux-oem, linux-image-4.15.0-1076-snapdragon, linux-image-gcp, linux-image-4.15.0-1060-gcp, linux-image-oracle, linux-image-gke-4.15, linux-kvm, linux-aws, linux-image-aws, linux-raspi2, linux-image-kvm, linux-image-raspi2, linux-image-aws-hwe, linux-image-azure, linux-image-4.15.0-1058-kvm, linux-image-oracle-lts-18.04, linux-image-snapdragon, linux-image-azure-edge, linux-image-4.15.0-1077-azure, linux-image-aws-lts-18.04, linux-image-gke, linux-image-4.15.0-1079-oem, linux-snapdragon, linux-azure, linux-gcp
• USN-4318-1: linux-image-4.15.0-96-generic-lpae, linux, linux-image-4.15.0-96-generic, linux-image-generic-lpae-hwe-16.04-edge, linux-image-lowlatency, linux-image-lowlatency-hwe-16.04, linux-image-generic, linux-image-oem, linux-image-virtual, linux-hwe, linux-image-generic-hwe-16.04, linux-image-virtual-hwe-16.04, linux-image-virtual-hwe-16.04-edge, linux-image-4.15.0-96-lowlatency, linux-image-generic-lpae, linux-image-generic-hwe-16.04-edge, linux-image-lowlatency-hwe-16.04-edge, linux-image-generic-lpae-hwe-16.04
• LSN-0065-1: generic-4.15, gcp, generic-4.4, aws, azure, lowlatency-4.15, lowlatency-4.4