USN-4525-1: Linux kernel vulnerabilities

24 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-5.4 - Linux kernel for Amazon Web Services (AWS) systems
  • linux-azure - Linux kernel for Microsoft Azure Cloud systems
  • linux-azure-5.4 - Linux kernel for Microsoft Azure cloud systems
  • linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-gcp-5.4 - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-hwe-5.4 - Linux hardware enablement (HWE) kernel
  • linux-kvm - Linux kernel for cloud environments
  • linux-oracle - Linux kernel for Oracle Cloud systems
  • linux-oracle-5.4 - Linux kernel for Oracle Cloud systems
  • linux-raspi - Linux kernel for Raspberry Pi (V8) systems
  • linux-raspi-5.4 - Linux kernel for Raspberry Pi (V8) systems

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

It was discovered that the NFS client implementation in the Linux kernel
did not properly perform bounds checking before copying security labels in
some situations. A local attacker could use this to cause a denial of
service (system crash) or possibly execute arbitrary code. (CVE-2020-25212)

Update instructions

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

Ubuntu 20.04
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-4526-1: linux-aws, linux-gke-4.15, linux-image-raspi2, linux-image-virtual-hwe-16.04, linux-image-aws-hwe, linux-image-4.15.0-1054-oracle, linux-raspi2, linux-image-oem, linux-image-4.15.0-1071-raspi2, linux-image-4.15.0-118-lowlatency, linux-image-4.15.0-1075-kvm, linux-image-powerpc64-emb, linux-gcp-4.15, linux-image-powerpc-e500mc, linux-gcp, linux-image-virtual, linux-image-4.15.0-1087-snapdragon, linux-oem, linux-image-powerpc-smp, linux-image-gcp, linux-image-generic-lpae-hwe-16.04, linux-image-gke-4.15, linux-image-azure-lts-18.04, linux-image-oracle-lts-18.04, linux-azure-4.15, linux-azure, linux-kvm, linux-snapdragon, linux-image-azure, linux, linux-image-4.15.0-1097-oem, linux-image-snapdragon, linux-image-lowlatency-hwe-16.04, linux-image-aws-lts-18.04, linux-image-generic, linux-oracle, linux-image-kvm, linux-image-4.15.0-1084-gcp, linux-image-generic-hwe-16.04, linux-image-oracle, linux-image-generic-lpae, linux-image-gke, linux-image-lowlatency, linux-image-4.15.0-1070-gke, linux-image-azure-edge, linux-image-powerpc64-smp, linux-image-4.15.0-1083-aws, linux-aws-hwe, linux-image-4.15.0-118-generic, linux-hwe, linux-image-4.15.0-1096-azure, linux-image-4.15.0-118-generic-lpae, linux-image-gcp-lts-18.04
  • USN-4578-1: linux-image-4.15.0-121-lowlatency, linux-aws, linux-gke-4.15, linux-image-raspi2, linux-image-virtual-hwe-16.04, linux-image-aws-hwe, linux-raspi2, linux-image-oem, linux-image-powerpc64-emb, linux-gcp-4.15, linux-image-powerpc-e500mc, linux-gcp, linux-image-virtual, linux-oem, linux-image-4.15.0-1089-snapdragon, linux-image-gcp, linux-image-powerpc-smp, linux-image-4.15.0-1098-azure, linux-image-4.15.0-1099-azure, linux-image-generic-lpae-hwe-16.04, linux-image-gke-4.15, linux-image-4.15.0-1077-kvm, linux-image-4.15.0-1086-aws, linux-image-4.15.0-1099-oem, linux-image-4.15.0-121-generic-lpae, linux-image-azure-lts-18.04, linux-image-oracle-lts-18.04, linux-azure-4.15, linux-azure, linux-kvm, linux-snapdragon, linux-image-azure, linux, linux-image-snapdragon, linux-image-lowlatency-hwe-16.04, linux-image-4.15.0-120-generic, linux-image-aws-lts-18.04, linux-image-generic, linux-image-4.15.0-1086-gcp, linux-oracle, linux-image-kvm, linux-image-4.15.0-1085-aws, linux-image-generic-hwe-16.04, linux-image-oracle, linux-image-4.15.0-1072-gke, linux-image-generic-lpae, linux-image-4.15.0-1056-oracle, linux-image-gke, linux-image-lowlatency, linux-image-powerpc64-smp, linux-aws-hwe, linux-image-4.15.0-120-generic-lpae, linux-image-4.15.0-1057-oracle, linux-image-4.15.0-1073-raspi2, linux-hwe, linux-image-4.15.0-120-lowlatency, linux-image-4.15.0-121-generic, linux-image-gcp-lts-18.04
  • USN-4527-1: linux-aws, linux-image-raspi2, linux-raspi2, linux-image-4.4.0-190-generic, linux-image-powerpc64-emb, linux-image-powerpc-e500mc-lts-xenial, linux-image-powerpc-e500mc, linux-image-virtual, linux-image-powerpc-smp, linux-image-4.4.0-1078-aws, linux-image-4.4.0-1143-snapdragon, linux-image-4.4.0-190-powerpc-e500mc, linux-image-4.4.0-190-powerpc64-emb, linux-image-4.4.0-190-generic-lpae, linux-image-4.4.0-190-powerpc64-smp, linux-kvm, linux-image-powerpc-smp-lts-xenial, linux-image-powerpc64-emb-lts-xenial, linux-image-virtual-lts-xenial, linux, linux-image-snapdragon, linux-image-4.4.0-190-powerpc-smp, linux-image-4.4.0-190-lowlatency, linux-lts-xenial, linux-image-generic, linux-image-kvm, linux-image-generic-lts-xenial, linux-image-generic-lpae, linux-image-4.4.0-1139-raspi2, linux-image-4.4.0-1114-aws, linux-image-powerpc64-smp-lts-xenial, linux-image-powerpc64-smp, linux-image-generic-lpae-lts-xenial, linux-image-lowlatency-lts-xenial, linux-image-4.4.0-1080-kvm, linux-snapdragon, linux-image-aws, linux-image-lowlatency