USN-4412-1: Linux kernel vulnerabilities

06 July 2020

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-aws-5.3 - Linux kernel for Amazon Web Services (AWS) systems
  • linux-azure - Linux kernel for Microsoft Azure Cloud systems
  • linux-azure-5.3 - Linux kernel for Microsoft Azure Cloud systems
  • linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-gcp-5.3 - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-gke-5.3 - Linux kernel for Google Container Engine (GKE) systems
  • linux-hwe - Linux hardware enablement (HWE) kernel
  • linux-kvm - Linux kernel for cloud environments
  • linux-oracle - Linux kernel for Oracle Cloud systems
  • linux-oracle-5.3 - Linux kernel for Oracle Cloud systems
  • linux-raspi2-5.3 - Linux kernel for Raspberry Pi (V7) systems

Details

Matthew Sheets discovered that the SELinux network label handling
implementation in the Linux kernel could be coerced into de-referencing a
NULL pointer. A remote attacker could use this to cause a denial of service
(system crash). (CVE-2020-10711)

It was discovered that the SCSI generic (sg) driver in the Linux kernel did
not properly handle certain error conditions correctly. A local privileged
attacker could use this to cause a denial of service (system crash).
(CVE-2020-12770)

It was discovered that the USB Gadget device driver in the Linux kernel did
not validate arguments passed from configfs in some situations. A local
attacker could possibly use this to cause a denial of service (system
crash) or possibly expose sensitive information. (CVE-2020-13143)

Dmitry Vyukov discovered that the SELinux netlink security hook in the
Linux kernel did not validate messages in some situations. A privileged
attacker could use this to bypass SELinux netlink restrictions.
(CVE-2020-10751)

It was discovered that the KVM implementation in the Linux kernel did not
properly deallocate memory on initialization for some processors. A local
attacker could possibly use this to cause a denial of service.
(CVE-2020-12768)

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-4411-1: linux-image-generic, linux-image-lowlatency, linux-image-oem-osp1, linux-kvm, linux-image-5.4.0-1020-azure, linux-raspi, linux-riscv, linux-image-gcp, linux-gcp, linux-image-azure, linux-azure, linux-image-oem, linux-image-kvm, linux-image-5.4.0-1018-aws, linux-image-5.4.0-28-generic, linux-image-5.4.0-1019-gcp, linux-image-virtual, linux-image-raspi, linux-image-raspi2, linux-image-gke, linux-image-oracle, linux-image-5.4.0-1019-oracle, linux-oracle, linux-image-5.4.0-40-generic-lpae, linux-image-5.4.0-40-lowlatency, linux-image-5.4.0-40-generic, linux, linux-image-aws, linux-image-generic-lpae, linux-aws, linux-image-5.4.0-1013-raspi
  • USN-4419-1: linux-image-generic, linux-image-generic-lpae-lts-xenial, linux-image-lowlatency, linux-image-4.4.0-185-powerpc64-smp, linux-kvm, linux-image-4.4.0-185-powerpc64-emb, linux-image-powerpc64-smp, linux-image-snapdragon, linux-image-4.4.0-185-generic, linux-image-powerpc64-smp-lts-xenial, linux-snapdragon, linux-image-virtual-lts-xenial, linux-image-powerpc-e500mc-lts-xenial, linux-image-powerpc-smp, linux-image-4.4.0-1135-raspi2, linux-image-4.4.0-1110-aws, linux-image-lowlatency-lts-xenial, linux-image-kvm, linux-image-generic-lts-xenial, linux-image-virtual, linux-image-raspi2, linux-image-powerpc64-emb, linux-image-powerpc-e500mc, linux-image-4.4.0-185-powerpc-e500mc, linux-image-4.4.0-185-generic-lpae, linux, linux-image-aws, linux-image-generic-lpae, linux-lts-xenial, linux-image-powerpc64-emb-lts-xenial, linux-aws, linux-image-4.4.0-185-powerpc-smp, linux-raspi2, linux-image-4.4.0-1074-aws, linux-image-4.4.0-185-lowlatency, linux-image-4.4.0-1076-kvm, linux-image-powerpc-smp-lts-xenial, linux-image-4.4.0-1139-snapdragon
  • USN-4389-1: linux-image-generic, linux-image-5.4.0-1015-gcp, linux-image-lowlatency, linux-image-oem-osp1, linux-kvm, linux-image-5.4.0-37-lowlatency, linux-raspi, linux-riscv, linux-image-lowlatency-hwe-20.04, linux-image-gcp, linux-gcp, linux-image-azure, linux-azure, linux-image-5.4.0-1016-azure, linux-image-oem, linux-image-5.4.0-37-generic-lpae, linux-image-kvm, linux-image-virtual, linux-image-raspi, linux-image-raspi2, linux-image-virtual-hwe-20.04, linux-image-gke, linux-image-5.4.0-1015-oracle, linux-image-oracle, linux-image-generic-lpae-hwe-20.04, linux-oracle, linux, linux-image-aws, linux-image-generic-lpae, linux-aws, linux-image-5.4.0-1015-aws, linux-image-5.4.0-37-generic, linux-image-generic-hwe-20.04, linux-image-5.4.0-1012-raspi, linux-image-5.4.0-1015-kvm, linux-image-5.4.0-27-generic
  • USN-4414-1: linux-image-generic, linux-image-4.15.0-1069-kvm, linux-image-4.15.0-109-lowlatency, linux-image-generic-hwe-16.04, linux-image-lowlatency, linux-gcp-4.15, linux-image-4.15.0-107-generic, linux-image-gke-4.15, linux-kvm, linux-image-4.15.0-107-generic-lpae, linux-image-4.15.0-1078-gcp, linux-image-powerpc64-smp, linux-image-4.15.0-1065-raspi2, linux-image-snapdragon, linux-image-gcp, linux-gcp, linux-image-virtual-hwe-16.04, linux-image-4.15.0-107-lowlatency, linux-image-azure, linux-snapdragon, linux-aws-hwe, linux-gke-4.15, linux-azure-4.15, linux-oem, linux-azure, linux-image-aws-hwe, linux-image-powerpc-smp, linux-image-oem, linux-image-azure-lts-18.04, linux-image-lowlatency-hwe-16.04, linux-image-kvm, linux-image-4.15.0-1046-oracle, linux-image-virtual, linux-image-4.15.0-1081-snapdragon, linux-image-gcp-lts-18.04, linux-image-raspi2, linux-image-4.15.0-1074-aws, linux-image-gke, linux-image-powerpc64-emb, linux-image-oracle-lts-18.04, linux-hwe, linux-image-oracle, linux-image-powerpc-e500mc, linux-oracle, linux-image-4.15.0-1064-gke, linux, linux-image-4.15.0-1091-azure, linux-image-4.15.0-1091-oem, linux-image-aws-lts-18.04, linux-image-generic-lpae, linux-image-4.15.0-1077-aws, linux-image-4.15.0-109-generic, linux-aws, linux-image-4.15.0-109-generic-lpae, linux-raspi2, linux-image-generic-lpae-hwe-16.04, linux-image-4.15.0-1048-oracle
  • USN-4413-1: linux-image-5.0.0-1043-gke, linux-image-gke-5.0, linux-gke-5.0, linux-oem-osp1, linux-image-oem-osp1, linux-image-5.0.0-1063-oem-osp1
  • USN-4391-1: linux-image-generic, linux-image-generic-lpae-lts-xenial, linux-image-lowlatency, linux-kvm, linux-image-4.4.0-1075-kvm, linux-image-4.4.0-1134-raspi2, linux-image-powerpc64-smp, linux-image-snapdragon, linux-image-powerpc64-smp-lts-xenial, linux-snapdragon, linux-image-virtual-lts-xenial, linux-image-powerpc-e500mc-lts-xenial, linux-image-powerpc-smp, linux-image-4.4.0-184-powerpc64-smp, linux-image-4.4.0-1109-aws, linux-image-4.4.0-184-powerpc-smp, linux-image-lowlatency-lts-xenial, linux-image-4.4.0-184-generic-lpae, linux-image-kvm, linux-image-generic-lts-xenial, linux-image-virtual, linux-image-raspi2, linux-image-powerpc64-emb, linux-image-4.4.0-184-generic, linux-image-4.4.0-184-powerpc64-emb, linux-image-powerpc-e500mc, linux-image-4.4.0-184-powerpc-e500mc, linux, linux-image-aws, linux-image-4.4.0-1073-aws, linux-image-generic-lpae, linux-lts-xenial, linux-image-powerpc64-emb-lts-xenial, linux-aws, linux-raspi2, linux-image-4.4.0-1138-snapdragon, linux-image-powerpc-smp-lts-xenial, linux-image-4.4.0-184-lowlatency
  • USN-4390-1: linux-image-generic, linux-image-4.15.0-1063-raspi2, linux-image-generic-hwe-16.04, linux-image-lowlatency, linux-image-gke-4.15, linux-kvm, linux-image-4.15.0-1089-azure, linux-image-powerpc64-smp, linux-image-snapdragon, linux-image-4.15.0-1073-aws, linux-image-gcp, linux-gcp, linux-image-virtual-hwe-16.04, linux-image-azure, linux-image-4.15.0-1077-gcp, linux-snapdragon, linux-aws-hwe, linux-gke-4.15, linux-azure-4.15, linux-oem, linux-azure, linux-image-aws-hwe, linux-image-powerpc-smp, linux-image-4.15.0-1045-oracle, linux-image-4.15.0-106-generic-lpae, linux-image-azure-lts-18.04, linux-image-oem, linux-image-lowlatency-hwe-16.04, linux-image-kvm, linux-image-4.15.0-1063-gke, linux-image-4.15.0-1087-oem, linux-image-virtual, linux-image-raspi2, linux-image-gke, linux-image-powerpc64-emb, linux-image-oracle-lts-18.04, linux-hwe, linux-image-4.15.0-1080-snapdragon, linux-image-oracle, linux-image-powerpc-e500mc, linux-oracle, linux, linux-image-4.15.0-1067-kvm, linux-image-aws-lts-18.04, linux-image-4.15.0-106-lowlatency, linux-image-generic-lpae, linux-aws, linux-raspi2, linux-image-4.15.0-106-generic, linux-image-generic-lpae-hwe-16.04, linux-image-azure-edge