USN-4526-1: Linux kernel vulnerabilities

23 September 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-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)

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-4208-1: linux-image-5.3.0-24-generic, linux-image-5.3.0-24-snapdragon, linux-gcp-5.3, linux-image-snapdragon, linux-image-generic, linux-image-aws, linux-image-5.3.0-1008-aws, linux-image-gcp-edge, linux-image-5.3.0-1008-kvm, linux-aws, linux-image-5.3.0-24-generic-lpae, linux-image-kvm, linux-image-5.3.0-1007-oracle, linux-image-gcp, linux-image-generic-lpae, linux, linux-oracle, linux-image-gke, linux-image-virtual, linux-image-oracle, linux-gcp, linux-image-5.3.0-1009-gcp, linux-kvm, linux-image-5.3.0-24-lowlatency, linux-image-lowlatency
  • USN-4226-1: linux-oem-osp1, linux-image-azure, linux-image-aws-edge, linux-image-generic, linux-image-5.0.0-1009-oracle, linux-image-aws, linux-image-gke-5.0, linux-image-5.0.0-38-generic, linux-image-raspi2, linux-image-oem-osp1, linux-aws, linux-image-kvm, linux-oracle-5.0, linux-image-5.0.0-1027-gke, linux-image-5.0.0-38-lowlatency, linux-azure, linux-image-5.0.0-1028-gcp, linux-raspi2, linux-image-gcp, linux-image-generic-lpae, linux-image-5.0.0-1028-azure, linux-image-oracle-edge, linux, linux-image-5.0.0-1033-oem-osp1, linux-aws-5.0, linux-oracle, linux-image-gke, linux-image-5.0.0-1024-raspi2, linux-image-virtual, linux-gke-5.0, linux-image-5.0.0-1024-kvm, linux-image-oracle, linux-gcp, linux-kvm, linux-image-5.0.0-1023-aws, linux-image-lowlatency, linux-image-5.0.0-38-generic-lpae
  • USN-4483-1: linux-image-virtual-hwe-18.04, linux-aws-5.4, linux-image-5.4.0-1022-aws, linux-image-gke-5.4, linux-image-azure, linux-image-aws-edge, linux-image-generic, linux-image-aws, linux-raspi-5.4, linux-image-5.4.0-45-generic, linux-image-raspi2, linux-image-oem-osp1, linux-aws, linux-image-snapdragon-hwe-18.04, linux-hwe-5.4, linux-image-gkeop-5.4, linux-image-kvm, linux-image-5.4.0-1022-oracle, linux-oracle-5.4, linux-azure, linux-image-raspi, linux-image-lowlatency-hwe-18.04, linux-image-gcp, linux-gcp-5.4, linux-image-generic-lpae, linux, linux-image-5.4.0-1016-raspi, linux-image-5.4.0-45-lowlatency, linux-image-generic-hwe-18.04, linux-oracle, linux-image-5.4.0-45-generic-lpae, linux-image-gke, linux-image-5.4.0-1022-gcp, linux-azure-5.4, linux-image-virtual, linux-raspi, linux-image-generic-lpae-hwe-18.04, linux-image-oracle, linux-image-raspi-hwe-18.04, linux-gcp, linux-kvm, linux-image-lowlatency, linux-image-5.4.0-1023-azure, linux-image-oem
  • USN-4484-1: linux-hwe, linux-image-5.3.0-1034-gke, linux-image-gke-5.3, linux-image-5.3.0-1034-aws, linux-aws-5.3, linux-image-raspi2-hwe-18.04, linux-image-5.3.0-1032-raspi2, linux-image-5.3.0-66-lowlatency, linux-image-gkeop-5.3, linux-image-aws, linux-raspi2-5.3, linux-gke-5.3, linux-image-5.3.0-66-generic
  • USN-4525-1: linux-image-virtual-hwe-18.04, linux-aws-5.4, linux-image-5.4.0-1019-raspi, linux-image-azure, linux-image-5.4.0-1025-gcp, linux-image-generic, linux-image-aws, linux-image-5.4.0-1025-oracle, linux-raspi-5.4, linux-image-raspi2, linux-image-5.4.0-48-generic-lpae, linux-image-5.4.0-48-lowlatency, linux-image-oem-osp1, linux-aws, linux-image-snapdragon-hwe-18.04, linux-image-5.4.0-1026-azure, linux-hwe-5.4, linux-image-kvm, linux-oracle-5.4, linux-azure, linux-image-raspi, linux-image-5.4.0-1025-aws, linux-image-lowlatency-hwe-18.04, linux-image-gcp, linux-image-5.4.0-48-generic, linux-gcp-5.4, linux-image-generic-lpae, linux-image-5.4.0-1024-kvm, linux, linux-image-generic-hwe-18.04, linux-oracle, linux-image-gke, linux-azure-5.4, linux-image-virtual, linux-raspi, linux-image-generic-lpae-hwe-18.04, linux-image-oracle, linux-image-raspi-hwe-18.04, linux-gcp, linux-kvm, linux-image-lowlatency, linux-image-oem
  • USN-4527-1: linux-image-4.4.0-1114-aws, linux-image-4.4.0-190-powerpc-e500mc, linux-image-4.4.0-1139-raspi2, linux-image-snapdragon, linux-image-powerpc64-smp, linux-image-generic, linux-image-virtual-lts-xenial, linux-image-generic-lpae-lts-xenial, linux-image-aws, linux-lts-xenial, linux-image-powerpc64-emb-lts-xenial, linux-image-lowlatency, linux-image-raspi2, linux-aws, linux-image-4.4.0-190-generic, linux-snapdragon, linux-image-kvm, linux-image-4.4.0-190-powerpc64-smp, linux-image-4.4.0-1143-snapdragon, linux-image-powerpc-smp-lts-xenial, linux-image-powerpc64-smp-lts-xenial, linux-raspi2, linux-image-4.4.0-190-generic-lpae, linux-image-generic-lpae, linux-image-4.4.0-1078-aws, linux-image-generic-lts-xenial, linux-image-lowlatency-lts-xenial, linux, linux-image-powerpc64-emb, linux-image-powerpc-e500mc, linux-image-powerpc-e500mc-lts-xenial, linux-image-powerpc-smp, linux-image-virtual, linux-image-4.4.0-1080-kvm, linux-image-4.4.0-190-powerpc-smp, linux-kvm, linux-image-4.4.0-190-powerpc64-emb, linux-image-4.4.0-190-lowlatency