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USN-4526-1: Linux kernel vulnerabilities

23 September 2020

Several security issues were fixed in the Linux kernel.

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Releases

Packages

  • linux - Linux kernel
  • linux-aws - Linux kernel for Amazon Web Services (AWS) systems
  • linux-aws-hwe - Linux kernel for Amazon Web Services (AWS-HWE) systems
  • linux-azure - Linux kernel for Microsoft Azure Cloud systems
  • linux-azure-4.15 - Linux kernel for Microsoft Azure Cloud systems
  • linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-gcp-4.15 - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-gke-4.15 - Linux kernel for Google Container Engine (GKE) systems
  • linux-hwe - Linux hardware enablement (HWE) kernel
  • linux-kvm - Linux kernel for cloud environments
  • linux-oem - Linux kernel for OEM systems
  • linux-oracle - Linux kernel for Oracle Cloud systems
  • linux-raspi2 - Linux kernel for Raspberry Pi (V8) systems
  • linux-snapdragon - Linux kernel for Qualcomm Snapdragon processors

Details

It was discovered that the AMD Cryptographic Coprocessor device driver in
the Linux kernel did not properly deallocate memory in some situations. A
local attacker could use this to cause a denial of service (memory
exhaustion). (CVE-2019-18808)

It was discovered that the Conexant 23885 TV card device driver for the
Linux kernel did not properly deallocate memory in some error conditions. A
local attacker could use this to cause a denial of service (memory
exhaustion). (CVE-2019-19054)

It was discovered that the ADIS16400 IIO IMU Driver for the Linux kernel
did not properly deallocate memory in certain error conditions. A local
attacker could use this to cause a denial of service (memory exhaustion).
(CVE-2019-19061)

It was discovered that the AMD Audio Coprocessor driver for the Linux
kernel did not properly deallocate memory in certain error conditions. A
local attacker with the ability to load modules could use this to cause a
denial of service (memory exhaustion). (CVE-2019-19067)

It was discovered that the Atheros HTC based wireless driver in the Linux
kernel did not properly deallocate in certain error conditions. A local
attacker could use this to cause a denial of service (memory exhaustion).
(CVE-2019-19073, CVE-2019-19074)

It was discovered that the F2FS file system in the Linux kernel did not
properly perform bounds checking in some situations, leading to an out-of-
bounds read. A local attacker could possibly use this to expose sensitive
information (kernel memory). (CVE-2019-9445)

It was discovered that the VFIO PCI driver in the Linux kernel did not
properly handle attempts to access disabled memory spaces. A local attacker
could use this to cause a denial of service (system crash).
(CVE-2020-12888)

It was discovered that the cgroup v2 subsystem in the Linux kernel did not
properly perform reference counting in some situations, leading to a NULL
pointer dereference. A local attacker could use this to cause a denial of
service or possibly gain administrative privileges. (CVE-2020-14356)

It was discovered that the state of network RNG in the Linux kernel was
potentially observable. A remote attacker could use this to expose
sensitive information. (CVE-2020-16166)

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Update instructions

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

Ubuntu 18.04
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.

Related notices

  • USN-4525-1: linux-image-lowlatency-hwe-20.04, linux-image-5.4.0-1025-oracle, linux-image-lowlatency, linux-image-5.4.0-1019-raspi, linux-image-generic-hwe-18.04-edge, linux-image-generic, linux-raspi-5.4, linux-image-5.4.0-48-generic, linux-image-gcp, linux-image-5.4.0-1025-gcp, linux-gcp, linux-image-generic-hwe-18.04, linux-image-lowlatency-hwe-18.04-edge, linux-image-oracle-edge, linux-image-virtual-hwe-20.04, linux, linux-image-virtual, linux-image-snapdragon-hwe-18.04, linux-image-raspi-hwe-18.04, linux-image-virtual-hwe-18.04, linux-image-5.4.0-1024-kvm, linux-image-generic-lpae-hwe-18.04-edge, linux-image-oem, linux-image-aws-edge, linux-image-oem-osp1, linux-image-5.4.0-1025-aws, linux-image-5.4.0-1026-azure, linux-image-azure-edge, linux-image-oracle, linux-kvm, linux-gcp-5.4, linux-hwe-5.4, linux-image-generic-hwe-20.04, linux-raspi, linux-azure, linux-image-gcp-edge, linux-image-aws, linux-image-5.4.0-48-generic-lpae, linux-image-gke, linux-image-kvm, linux-image-generic-lpae, linux-image-raspi, linux-image-snapdragon-hwe-18.04-edge, linux-image-5.4.0-48-lowlatency, linux-azure-5.4, linux-image-azure, linux-image-generic-lpae-hwe-18.04, linux-aws-5.4, linux-image-raspi2-hwe-18.04-edge, linux-aws, linux-image-virtual-hwe-18.04-edge, linux-image-raspi2, linux-oracle, linux-image-raspi2-hwe-18.04, linux-image-raspi-hwe-18.04-edge, linux-image-lowlatency-hwe-18.04, linux-image-generic-lpae-hwe-20.04, linux-oracle-5.4
  • USN-4527-1: linux-image-powerpc64-smp-lts-utopic, linux-image-4.4.0-190-powerpc64-smp, linux-image-generic-lts-vivid, linux-image-lowlatency-lts-xenial, linux-image-virtual-lts-vivid, linux-image-lowlatency, linux-image-powerpc-smp-lts-wily, linux-image-4.4.0-190-powerpc-smp, linux-image-powerpc-e500mc-lts-vivid, linux-image-generic-lts-wily, linux-image-generic, linux-image-4.4.0-1080-kvm, linux-image-generic-lpae-lts-utopic, linux-lts-xenial, linux-image-4.4.0-190-generic, linux-image-generic-lpae-lts-vivid, linux-image-powerpc-smp-lts-xenial, linux-image-powerpc-smp-lts-vivid, linux-image-powerpc64-emb-lts-utopic, linux, linux-image-4.4.0-1078-aws, linux-image-generic-lts-xenial, linux-image-lowlatency-lts-vivid, linux-image-powerpc64-emb-lts-wily, linux-image-powerpc64-smp-lts-vivid, linux-image-4.4.0-190-powerpc64-emb, linux-image-virtual, linux-image-4.4.0-1114-aws, linux-image-4.4.0-190-powerpc-e500mc, linux-image-powerpc-e500mc-lts-utopic, linux-image-virtual-lts-utopic, linux-raspi2, linux-image-powerpc-e500mc-lts-xenial, linux-kvm, linux-image-lowlatency-lts-wily, linux-image-lowlatency-lts-utopic, linux-image-powerpc64-emb-lts-vivid, linux-image-powerpc64-smp, linux-image-powerpc-e500mc-lts-wily, linux-image-4.4.0-1139-raspi2, linux-image-powerpc64-smp-lts-wily, linux-image-powerpc64-smp-lts-xenial, linux-image-generic-lpae-lts-xenial, linux-image-aws, linux-image-generic-lts-utopic, linux-image-generic-lpae-lts-wily, linux-image-powerpc64-emb-lts-xenial, linux-image-kvm, linux-image-virtual-lts-wily, linux-image-generic-lpae, linux-image-snapdragon, linux-image-powerpc-smp-lts-utopic, linux-image-4.4.0-1143-snapdragon, linux-image-virtual-lts-xenial, linux-snapdragon, linux-aws, linux-image-4.4.0-190-generic-lpae, linux-image-powerpc-e500mc, linux-image-raspi2, linux-image-powerpc64-emb, linux-image-4.4.0-190-lowlatency, linux-image-powerpc-smp
  • USN-4208-1: linux-image-lowlatency, linux-gcp-5.3, linux-image-generic, linux-image-gcp, linux-image-5.3.0-24-generic, linux-gcp, linux, linux-image-virtual, linux-image-5.3.0-24-generic-lpae, linux-image-5.3.0-1008-kvm, linux-kvm, linux-image-oracle, linux-image-5.3.0-1008-aws, linux-image-gcp-edge, linux-image-5.3.0-1007-oracle, linux-image-aws, linux-image-gke, linux-image-kvm, linux-image-generic-lpae, linux-image-snapdragon, linux-image-5.3.0-24-lowlatency, linux-aws, linux-oracle, linux-image-5.3.0-24-snapdragon, linux-image-5.3.0-1009-gcp
  • USN-4904-1: linux-image-4.4.0-208-powerpc64-smp, linux-image-powerpc64-smp-lts-utopic, linux-image-generic-lts-vivid, linux-image-lowlatency-lts-xenial, linux-image-virtual-lts-vivid, linux-image-lowlatency, linux-image-powerpc-smp-lts-wily, linux-image-powerpc-e500mc-lts-vivid, linux-image-generic-lts-wily, linux-image-4.4.0-208-powerpc-smp, linux-image-generic, linux-image-generic-lpae-lts-utopic, linux-lts-xenial, linux-image-4.4.0-1150-raspi2, linux-image-generic-lpae-lts-vivid, linux-image-powerpc-smp-lts-xenial, linux-image-powerpc-smp-lts-vivid, linux-image-4.4.0-1091-kvm, linux-image-powerpc64-emb-lts-utopic, linux, linux-image-4.4.0-1090-aws, linux-image-4.4.0-208-lowlatency, linux-image-generic-lts-xenial, linux-image-lowlatency-lts-vivid, linux-image-powerpc64-emb-lts-wily, linux-image-powerpc64-smp-lts-vivid, linux-image-virtual, linux-image-powerpc-e500mc-lts-utopic, linux-image-virtual-lts-utopic, linux-raspi2, linux-image-powerpc-e500mc-lts-xenial, linux-kvm, linux-image-lowlatency-lts-wily, linux-image-lowlatency-lts-utopic, linux-image-powerpc64-emb-lts-vivid, linux-image-powerpc64-smp, linux-image-4.4.0-1154-snapdragon, linux-image-powerpc-e500mc-lts-wily, linux-image-4.4.0-208-generic, linux-image-powerpc64-smp-lts-wily, linux-image-powerpc64-smp-lts-xenial, linux-image-generic-lpae-lts-xenial, linux-image-4.4.0-208-generic-lpae, linux-image-aws, linux-image-generic-lts-utopic, linux-image-generic-lpae-lts-wily, linux-image-powerpc64-emb-lts-xenial, linux-image-kvm, linux-image-virtual-lts-wily, linux-image-generic-lpae, linux-image-4.4.0-208-powerpc-e500mc, linux-image-powerpc-smp-lts-utopic, linux-image-snapdragon, linux-image-virtual-lts-xenial, linux-snapdragon, linux-aws, linux-image-powerpc-e500mc, linux-image-4.4.0-208-powerpc64-emb, linux-image-raspi2, linux-image-4.4.0-1126-aws, linux-image-powerpc64-emb, linux-image-powerpc-smp
  • USN-4226-1: linux-image-lowlatency, linux-image-5.0.0-1024-kvm, linux-image-generic, linux-image-gcp, linux-gcp, linux-image-oracle-edge, linux, linux-image-virtual, linux-oem-osp1, linux-raspi2, linux-gke-5.0, linux-image-aws-edge, linux-image-oem-osp1, linux-kvm, linux-image-oracle, linux-azure, linux-image-5.0.0-1027-gke, linux-image-gke-5.0, linux-image-aws, linux-image-gke, linux-image-kvm, linux-image-generic-lpae, linux-image-azure, linux-image-5.0.0-1024-raspi2, linux-aws-5.0, linux-aws, linux-image-raspi2, linux-image-5.0.0-38-generic-lpae, linux-image-5.0.0-1023-aws, linux-oracle, linux-image-5.0.0-1028-azure, linux-image-5.0.0-38-generic, linux-oracle-5.0, linux-image-5.0.0-1033-oem-osp1, linux-image-5.0.0-1009-oracle, linux-image-5.0.0-1028-gcp, linux-image-5.0.0-38-lowlatency
  • USN-5361-1: linux-hwe-generic-trusty, linux-image-4.4.0-1139-aws, linux-headers-virtual-lts-xenial, linux-image-generic-lts-vivid, linux-image-lowlatency-lts-xenial, linux-tools-generic-lts-wily, linux-image-lowlatency, linux-tools-lowlatency, linux-tools-lowlatency-lts-utopic, linux-image-4.4.0-223-generic, linux-image-generic, linux-image-generic-lts-wily, linux-doc, linux-lowlatency-lts-vivid, linux-cloud-tools-4.4.0-1139-aws, linux-headers-generic-lts-xenial, linux, linux-signed-lowlatency-lts-wily, linux-image-4.4.0-1103-aws, linux-virtual-lts-utopic, linux-lts-xenial-tools-4.4.0-223, linux-cloud-tools-virtual-lts-vivid, linux-cloud-tools-virtual, linux-tools-generic-lts-utopic, linux-modules-4.4.0-1139-aws, linux-modules-4.4.0-223-lowlatency, linux-headers-lowlatency-lts-utopic, linux-headers-generic-lts-vivid, linux-headers-generic-lts-utopic, linux-cloud-tools-lowlatency-lts-vivid, linux-signed-generic-lts-vivid, linux-image-4.4.0-223-lowlatency, linux-cloud-tools-generic-lts-vivid, linux-tools-virtual-lts-vivid, linux-modules-4.4.0-223-generic, linux-image-aws, linux-image-generic-lts-utopic, linux-virtual-lts-xenial, linux-image-kvm, linux-modules-4.4.0-1104-kvm, linux-cloud-tools-generic-lts-utopic, linux-signed-image-lowlatency-lts-xenial, linux-headers-generic, linux-signed-image-generic-lts-utopic, linux-cloud-tools-lowlatency, linux-lowlatency-lts-xenial, linux-tools-lts-utopic, linux-tools-4.4.0-223, linux-signed-image-lowlatency-lts-wily, linux-tools-virtual, linux-virtual-lts-vivid, linux-signed-image-generic-lts-wily, linux-buildinfo-4.4.0-223-generic, linux-cloud-tools-4.4.0-223-generic, linux-tools-4.4.0-1104-kvm, linux-cloud-tools-generic, linux-cloud-tools-lowlatency-lts-utopic, linux-generic, linux-headers-lowlatency-lts-wily, linux-tools-4.4.0-1139-aws, linux-tools-lowlatency-lts-xenial, linux-aws-cloud-tools-4.4.0-1139, linux-kvm-headers-4.4.0-1104, linux-cloud-tools-lowlatency-lts-wily, linux-image-virtual, linux-tools-generic, linux-headers-kvm, linux-libc-dev, linux-tools-common, linux-source-4.4.0, linux-tools-host, linux-image-extra-virtual-lts-vivid, linux-image-unsigned-4.4.0-223-lowlatency, linux-kvm, linux-headers-4.4.0-1104-kvm, linux-image-lowlatency-lts-wily, linux-lowlatency-lts-utopic, linux-image-lowlatency-lts-utopic, linux-signed-image-generic-lts-vivid, linux-aws-headers-4.4.0-1103, linux-tools-generic-lts-xenial, linux-headers-lowlatency, linux-headers-aws, linux-headers-lowlatency-lts-xenial, linux-modules-extra-4.4.0-1139-aws, linux-signed-lowlatency-lts-xenial, linux-image-virtual-lts-xenial, linux-image-4.4.0-1104-kvm, linux-modules-extra-4.4.0-223-generic, linux-headers-generic-lts-wily, linux-kvm-tools-4.4.0-1104, linux-headers-4.4.0-1139-aws, linux-signed-image-generic, linux-cloud-tools-virtual-lts-wily, linux-image-virtual-lts-vivid, linux-modules-extra-aws, linux-buildinfo-4.4.0-1104-kvm, linux-buildinfo-4.4.0-1139-aws, linux-crashdump, linux-signed-generic-lts-wily, linux-headers-lowlatency-lts-vivid, linux-aws-tools-4.4.0-1103, linux-tools-virtual-lts-xenial, linux-cloud-tools-4.4.0-223-lowlatency, linux-generic-lts-wily, linux-tools-aws, linux-image-extra-virtual-lts-utopic, linux-image-extra-virtual-lts-xenial, linux-tools-4.4.0-1103-aws, linux-image-extra-virtual-lts-wily, linux-image-unsigned-4.4.0-223-generic, linux-cloud-tools-virtual-lts-xenial, linux-signed-generic-lts-utopic, linux-kvm-cloud-tools-4.4.0-1104, linux-tools-lowlatency-lts-vivid, linux-tools-virtual-lts-utopic, linux-tools-kvm, linux-tools-4.4.0-223-lowlatency, linux-headers-4.4.0-223, linux-tools-generic-lts-vivid, linux-generic-lts-vivid, linux-aws-cloud-tools-4.4.0-1103, linux-cloud-tools-virtual-lts-utopic, linux-hwe-virtual-trusty, linux-tools-lowlatency-lts-wily, linux-cloud-tools-generic-lts-wily, linux-signed-lowlatency, linux-cloud-tools-4.4.0-223, linux-cloud-tools-generic-lts-xenial, linux-virtual, linux-image-hwe-generic-trusty, linux-tools-virtual-lts-wily, linux-cloud-tools-4.4.0-1103-aws, linux-headers-virtual-lts-utopic, linux-lowlatency, linux-buildinfo-4.4.0-223-lowlatency, linux-signed-generic-lts-xenial, linux-aws-tools-4.4.0-1139, linux-cloud-tools-lowlatency-lts-xenial, linux-headers-4.4.0-1103-aws, linux-headers-virtual-lts-vivid, linux-lts-xenial, linux-headers-virtual-lts-wily, linux-headers-4.4.0-223-generic, linux-generic-lts-xenial, linux-virtual-lts-wily, linux-image-generic-lts-xenial, linux-image-lowlatency-lts-vivid, linux-lts-xenial-cloud-tools-4.4.0-223, linux-image-virtual-lts-utopic, linux-image-extra-virtual, linux-aws-headers-4.4.0-1139, linux-modules-4.4.0-1103-aws, linux-image-hwe-virtual-trusty, linux-source, linux-generic-lts-utopic, linux-buildinfo-4.4.0-1103-aws, linux-lowlatency-lts-wily, linux-signed-generic, linux-image-virtual-lts-wily, linux-aws, linux-cloud-tools-common, linux-headers-4.4.0-223-lowlatency, linux-cloud-tools-4.4.0-1104-kvm, linux-headers-virtual, linux-tools-4.4.0-223-generic, linux-signed-image-lowlatency, linux-signed-image-generic-lts-xenial
  • USN-4483-1: linux-image-5.4.0-45-generic, linux-image-lowlatency-hwe-20.04, linux-image-lowlatency, linux-image-generic-hwe-18.04-edge, linux-image-generic, linux-raspi-5.4, linux-image-5.4.0-1022-aws, linux-image-gcp, linux-image-generic-hwe-18.04, linux-gcp, linux-image-lowlatency-hwe-18.04-edge, linux-image-oracle-edge, linux-image-virtual-hwe-20.04, linux-oracle-5.4, linux, linux-image-virtual, linux-image-snapdragon-hwe-18.04, linux-image-raspi-hwe-18.04, linux-image-virtual-hwe-18.04, linux-image-generic-lpae-hwe-18.04-edge, linux-image-oem, linux-image-aws-edge, linux-image-oem-osp1, linux-kvm, linux-image-azure-edge, linux-image-oracle, linux-gcp-5.4, linux-hwe-5.4, linux-image-generic-hwe-20.04, linux-image-5.4.0-1016-raspi, linux-azure, linux-raspi, linux-image-gcp-edge, linux-image-aws, linux-image-gke, linux-image-5.4.0-45-lowlatency, linux-image-kvm, linux-image-generic-lpae, linux-image-raspi, linux-image-snapdragon-hwe-18.04-edge, linux-image-gke-5.4, linux-image-generic-lpae-hwe-18.04, linux-azure-5.4, linux-image-azure, linux-image-5.4.0-1023-azure, linux-image-5.4.0-45-generic-lpae, linux-aws-5.4, linux-image-raspi2-hwe-18.04-edge, linux-aws, linux-image-5.4.0-1022-gcp, linux-image-virtual-hwe-18.04-edge, linux-image-raspi2, linux-oracle, linux-image-raspi2-hwe-18.04, linux-image-5.4.0-1022-oracle, linux-image-raspi-hwe-18.04-edge, linux-image-lowlatency-hwe-18.04, linux-image-generic-lpae-hwe-20.04, linux-image-gkeop-5.4
  • USN-4484-1: linux-raspi2-5.3, linux-image-5.3.0-1034-aws, linux-aws-5.3, linux-image-gke-5.3, linux-image-raspi2-hwe-18.04, linux-image-5.3.0-66-lowlatency, linux-image-aws, linux-image-5.3.0-1034-gke, linux-image-5.3.0-66-generic, linux-image-gkeop-5.3, linux-image-5.3.0-1032-raspi2, linux-hwe, linux-gke-5.3