USN-4711-1: Linux kernel vulnerabilities

5 February 2021

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-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)

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.

References

Related notices

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

Join the discussion

Need help with your security needs?

Ubuntu Pro provides up to ten-year security coverage for over 23,000 open-source packages within the Ubuntu Main and Universe repositories.

Talk to an expert to find out what would work best for you

USN-4711-1: Linux kernel vulnerabilities

Reduce your security exposure

Releases

Packages

Details

Reduce your security exposure

Update instructions

Ubuntu 18.04

Ubuntu 16.04

Ubuntu 14.04

References

Related notices

Join the discussion

Need help with your security needs?

Further reading