USN-4711-1: Linux kernel vulnerabilities

05 February 2021

Several security issues were fixed in the Linux kernel.

Releases

Packages

  • 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-kvm - Linux kernel for cloud environments
  • 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 LIO SCSI target implementation in the Linux
kernel performed insufficient identifier checking in certain XCOPY
requests. An attacker with access to at least one LUN in a multiple
backstore environment could use this to expose sensitive information or
modify data. (CVE-2020-28374)

Kiyin (尹亮) discovered that the perf subsystem in the Linux kernel did
not properly deallocate memory in some situations. A privileged attacker
could use this to cause a denial of service (kernel memory exhaustion).
(CVE-2020-25704)

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-4694-1: linux-image-generic-lpae-hwe-20.04, linux-image-oem-20.04, linux-image-powerpc-e500mc-lts-utopic, linux-image-generic-hwe-18.04-edge, linux-image-lowlatency, linux-image-powerpc-e500mc, linux-image-lowlatency-lts-utopic, linux-image-powerpc64-emb-lts-wily, linux-image-lowlatency-lts-xenial, linux-image-generic-64k-hwe-20.04-edge, linux-image-generic-lts-utopic, linux-image-virtual-hwe-16.04-edge, linux-image-oem-osp1, linux-hwe-5.8, linux-image-powerpc-e500mc-lts-wily, linux-image-4.4.0-200-powerpc64-emb, linux-hwe, linux-image-virtual-hwe-20.04, linux-image-5.8.0-38-generic-64k, linux-image-generic-lpae, linux-image-4.15.0-132-generic-lpae, linux-image-powerpc64-emb-lts-xenial, linux-image-generic-lpae-hwe-16.04-edge, linux-image-4.4.0-200-powerpc-smp, linux-image-virtual-hwe-20.04-edge, linux-image-snapdragon-hwe-18.04, linux-image-generic-hwe-16.04, linux-image-generic-lpae-lts-vivid, linux-hwe-5.4, linux-image-5.4.0-62-generic, linux-image-lowlatency-hwe-20.04, linux-image-virtual-lts-wily, linux-image-4.4.0-200-generic, linux-image-generic-lpae-lts-utopic, linux-image-powerpc64-smp-lts-vivid, linux-image-generic-lpae-hwe-16.04, linux-image-lowlatency-hwe-18.04-edge, linux-image-powerpc-smp, linux-lts-xenial, linux-image-generic-lts-wily, linux-image-powerpc-e500mc-lts-xenial, linux-image-generic-64k, linux-image-oem, linux-image-generic-hwe-16.04-edge, linux-image-generic-64k-hwe-20.04, linux-image-4.15.0-132-lowlatency, linux-image-virtual-hwe-18.04-edge, linux-image-generic-hwe-20.04-edge, linux-image-5.8.0-38-generic-lpae, linux-image-generic-lpae-hwe-18.04, linux-image-powerpc64-smp-lts-wily, linux-image-4.4.0-200-powerpc64-smp, linux-image-virtual-lts-vivid, linux-image-lowlatency-lts-vivid, linux-image-powerpc-e500mc-lts-vivid, linux-image-powerpc-smp-lts-xenial, linux-image-lowlatency-hwe-20.04-edge, linux-image-4.4.0-200-generic-lpae, linux-image-5.8.0-38-lowlatency, linux-image-lowlatency-lts-wily, linux, linux-image-5.8.0-38-generic, linux-image-generic, linux-image-virtual-lts-utopic, linux-image-powerpc-smp-lts-utopic, linux-image-4.4.0-200-powerpc-e500mc, linux-image-generic-lts-xenial, linux-image-powerpc64-emb-lts-utopic, linux-image-virtual-hwe-16.04, linux-image-5.4.0-62-generic-lpae, linux-image-virtual-lts-xenial, linux-image-powerpc64-smp-lts-utopic, linux-image-powerpc-smp-lts-wily, linux-image-generic-lpae-lts-wily, linux-image-virtual, linux-image-generic-hwe-20.04, linux-image-powerpc-smp-lts-vivid, linux-image-4.4.0-200-lowlatency, linux-image-powerpc64-smp-lts-xenial, linux-image-lowlatency-hwe-18.04, linux-image-generic-lpae-lts-xenial, linux-image-powerpc64-smp, linux-image-lowlatency-hwe-16.04-edge, linux-image-virtual-hwe-18.04, linux-image-generic-lpae-hwe-18.04-edge, linux-image-generic-lpae-hwe-20.04-edge, linux-image-generic-hwe-18.04, linux-image-5.4.0-62-lowlatency, linux-image-powerpc64-emb-lts-vivid, linux-image-snapdragon-hwe-18.04-edge, linux-image-generic-lts-vivid, linux-image-powerpc64-emb, linux-image-4.15.0-132-generic, linux-image-lowlatency-hwe-16.04
  • USN-4751-1: linux-image-generic-lpae-hwe-20.04, linux-image-oem-20.04, linux-oracle, linux-image-kvm, linux-image-virtual, linux-image-5.8.0-44-lowlatency, linux-image-virtual-hwe-20.04-edge, linux-image-5.8.0-1023-azure, linux-image-5.8.0-44-generic-lpae, linux-image-generic-hwe-20.04, linux-image-5.8.0-1016-raspi-nolpae, linux-image-lowlatency, linux-image-gcp, linux-image-lowlatency-hwe-20.04-edge, linux-image-azure, linux-image-lowlatency-hwe-20.04, linux-raspi, linux-image-generic-64k-hwe-20.04-edge, linux, linux-image-5.8.0-1016-raspi, linux-image-raspi, linux-image-5.8.0-44-generic, linux-image-5.8.0-1019-kvm, linux-aws, linux-image-5.8.0-1024-aws, linux-gcp, linux-image-generic-64k, linux-image-generic-lpae-hwe-20.04-edge, linux-hwe-5.8, linux-image-generic, linux-image-generic-64k-hwe-20.04, linux-azure, linux-kvm, linux-image-raspi-nolpae, linux-image-virtual-hwe-20.04, linux-image-oracle, linux-image-5.8.0-44-generic-64k, linux-image-gke, linux-image-generic-lpae, linux-image-aws, linux-image-5.8.0-1023-gcp, linux-image-generic-hwe-20.04-edge, linux-image-5.8.0-1021-oracle
  • USN-4679-1: linux-image-generic-lpae-hwe-20.04, linux-image-5.4.0-1035-azure, linux-image-kvm, linux-image-virtual, linux-oracle, linux-image-azure-edge, linux-image-snapdragon-hwe-18.04, linux-image-generic-lpae-hwe-18.04, linux-image-aws-edge, linux-image-generic-hwe-18.04-edge, linux-image-generic-hwe-20.04, linux-image-oracle-edge, linux-image-5.4.0-1033-gke, linux-image-lowlatency, linux-image-gcp, linux-hwe-5.4, linux-oracle-5.4, linux-image-azure, linux-gke-5.4, linux-image-lowlatency-hwe-20.04, linux-image-raspi2, linux-image-raspi-hwe-18.04-edge, linux-image-lowlatency-hwe-18.04, linux-raspi, linux-image-5.4.0-1026-raspi, linux-azure-5.4, linux-image-raspi2-hwe-18.04-edge, linux, linux-image-raspi-hwe-18.04, linux-image-virtual-hwe-18.04, linux-image-raspi, linux-image-5.4.0-59-generic-lpae, linux-image-gke-5.4, linux-image-lowlatency-hwe-18.04-edge, linux-image-5.4.0-1034-oracle, linux-image-raspi2-hwe-18.04, linux-aws, linux-gcp, linux-image-5.4.0-59-generic, linux-image-oem-osp1, linux-image-oem, linux-image-generic-lpae-hwe-18.04-edge, linux-image-generic-hwe-18.04, linux-image-generic, linux-azure, linux-kvm, linux-image-gcp-edge, linux-aws-5.4, linux-gcp-5.4, linux-image-5.4.0-1034-aws, linux-image-virtual-hwe-20.04, linux-image-5.4.0-59-lowlatency, linux-image-oracle, linux-image-snapdragon-hwe-18.04-edge, linux-image-virtual-hwe-18.04-edge, linux-image-generic-lpae, linux-image-aws, linux-raspi-5.4, linux-image-5.4.0-1031-kvm, linux-image-5.4.0-1033-gcp
  • LSN-0074-1: fips, generic-4.4, aws, gcp, gkeop-5.4, aws-fips, gke, lowlatency-4.15, generic-4.15, generic-5.4, lowlatency-4.4, lowlatency-5.4, azure-fips, azure, gkeop, oem
  • USN-4752-1: linux-image-oem-20.04, linux-image-5.6.0-1048-oem, linux-oem-5.6
  • USN-4709-1: linux-image-4.4.0-1121-aws, linux-snapdragon, linux-image-kvm, linux-aws, linux-image-4.4.0-1145-raspi2, linux-image-raspi2, linux-image-4.4.0-1149-snapdragon, linux-image-aws, linux-image-snapdragon, linux-raspi2, linux-kvm, linux-image-4.4.0-1087-kvm, linux-image-4.4.0-1085-aws
  • USN-4901-1: linux-lts-trusty, linux-image-generic-lts-trusty, linux-image-3.13.0-185-generic
  • USN-4713-1: linux-image-5.8.0-1013-raspi, linux-image-5.4.0-1039-azure, linux-oracle, linux-image-kvm, linux-image-azure-edge, linux-image-aws-edge, linux-image-5.4.0-1028-raspi, linux-image-5.4.0-1032-kvm, linux-image-5.8.0-1021-aws, linux-image-oracle-edge, linux-image-5.8.0-1016-kvm, linux-image-5.4.0-1036-gcp, linux-image-5.8.0-1020-gcp, linux-image-5.8.0-1013-raspi-nolpae, linux-image-gcp, linux-oracle-5.4, linux-image-azure, linux-gke-5.4, linux-image-5.4.0-1037-aws, linux-image-raspi2, linux-image-raspi-hwe-18.04-edge, linux-raspi, linux-image-5.8.0-1020-azure, linux-azure-5.4, linux-image-raspi2-hwe-18.04-edge, linux-image-5.4.0-1035-gke, linux-image-raspi-hwe-18.04, linux-image-raspi, linux-image-gkeop-5.4, linux-image-gke-5.4, linux-image-raspi2-hwe-18.04, linux-aws, linux-gcp, linux-azure, linux-kvm, linux-gkeop-5.4, linux-image-gcp-edge, linux-aws-5.4, linux-image-5.4.0-1037-oracle, linux-image-5.8.0-1018-oracle, linux-image-5.4.0-1009-gkeop, linux-gcp-5.4, linux-image-raspi-nolpae, linux-image-oracle, linux-image-gke, linux-image-aws, linux-raspi-5.4
  • USN-4713-2: linux-image-3.13.0-184-powerpc-e500, linux-image-virtual, linux-image-3.13.0-184-generic-lpae, linux-image-5.3.0-1040-gke, linux-image-highbank, linux-image-gkeop-5.3, linux-gke-5.3, linux-image-server, linux-gke-5.0, linux-image-lowlatency, linux-image-powerpc-e500mc, linux-image-generic-lts-quantal, linux-image-3.13.0-184-powerpc-smp, linux-image-generic-pae, linux-image-3.13.0-184-lowlatency, linux-raspi2-5.3, linux-image-powerpc64-smp, linux-image-3.13.0-184-powerpc64-emb, linux, linux-image-5.3.0-70-lowlatency, linux-image-5.3.0-1037-raspi2, linux-image-generic-lts-saucy, linux-image-raspi2-hwe-18.04, linux-image-powerpc-smp, linux-image-omap, linux-image-generic-lts-trusty, linux-image-5.3.0-70-generic, linux-image-3.13.0-184-powerpc64-smp, linux-image-gke-5.0, linux-image-generic, linux-image-generic-lpae-lts-trusty, linux-image-powerpc-e500, linux-hwe, linux-image-3.13.0-184-powerpc-e500mc, linux-image-powerpc64-emb, linux-image-3.13.0-184-generic, linux-image-5.0.0-1051-gke, linux-image-generic-lpae-lts-saucy, linux-image-generic-lpae, linux-image-lowlatency-pae, linux-image-generic-lts-raring, linux-image-gke-5.3
  • USN-4753-1: linux-image-oem-20.04b, linux-image-oem-20.04-edge, linux-image-5.10.0-1014-oem, linux-oem-5.10
  • USN-4710-1: linux-image-virtual, linux-image-generic-lpae-hwe-16.04-edge, linux-image-4.15.0-133-lowlatency, linux-image-generic-hwe-16.04, linux-image-lowlatency, linux-image-4.15.0-135-generic-lpae, linux-image-lowlatency-hwe-16.04-edge, linux, linux-image-4.15.0-135-generic, linux-image-virtual-hwe-16.04-edge, linux-image-generic-lpae-hwe-16.04, linux-image-oem, linux-image-generic-hwe-16.04-edge, linux-image-generic, linux-image-4.15.0-133-generic-lpae, linux-hwe, linux-image-virtual-hwe-16.04, linux-image-4.15.0-133-generic, linux-image-4.15.0-135-lowlatency, linux-image-generic-lpae, linux-image-lowlatency-hwe-16.04