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USN-4710-1: Linux kernel vulnerability

3 February 2021

The system could be made to crash under certain conditions.

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Releases

Packages

  • linux - Linux kernel
  • linux-hwe - Linux hardware enablement (HWE) kernel

Details

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).

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

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-4679-1: linux-azure-5.4, linux-image-raspi, linux-image-raspi-hwe-18.04, linux-image-5.4.0-1033-gcp, linux-image-raspi2-hwe-18.04-edge, linux-image-5.4.0-1034-oracle, linux-image-generic-hwe-20.04, linux-image-kvm, linux-image-5.4.0-1031-kvm, linux-oracle-5.4, linux-gcp, linux-image-snapdragon-hwe-18.04, linux-image-virtual-hwe-20.04, linux-image-virtual-hwe-18.04-edge, linux-image-snapdragon-hwe-18.04-edge, linux-image-5.4.0-1026-raspi, linux-image-lowlatency, linux-aws, linux-image-lowlatency-hwe-18.04, linux-oracle, linux-image-raspi-hwe-18.04-edge, linux-image-raspi2-hwe-18.04, linux-image-generic-lpae-hwe-18.04-edge, linux-image-aws, linux-image-lowlatency-hwe-18.04-edge, linux-image-virtual-hwe-18.04, linux-hwe-5.4, linux-image-5.4.0-59-generic-lpae, linux-image-azure, linux-image-generic-hwe-18.04, linux-image-oracle, linux-image-generic-lpae-hwe-20.04, linux-image-azure-edge, linux-image-5.4.0-1035-azure, linux-image-oracle-edge, linux-raspi, linux-kvm, linux-image-virtual, linux-image-5.4.0-59-generic, linux-image-aws-edge, linux-image-gke-5.4, linux-image-generic-lpae-hwe-18.04, linux-raspi-5.4, linux-image-generic-hwe-18.04-edge, linux-image-oem-osp1, linux-image-5.4.0-59-lowlatency, linux-aws-5.4, linux-gcp-5.4, linux-image-oem, linux-image-gcp, linux-image-gcp-edge, linux-image-raspi2, linux-image-generic-lpae, linux-gke-5.4, linux-image-lowlatency-hwe-20.04, linux-image-5.4.0-1034-aws, linux-image-generic, linux-image-5.4.0-1033-gke, linux, linux-azure
  • USN-4711-1: linux-raspi2, linux-image-kvm, linux-image-azure-lts-18.04, linux-image-gke, linux-gcp, linux-azure-4.15, linux-image-snapdragon, linux-image-aws-hwe, linux-aws, linux-image-4.15.0-1095-snapdragon, linux-oracle, linux-image-gcp-lts-18.04, linux-gcp-4.15, linux-image-4.15.0-1078-gke, linux-aws-hwe, linux-image-4.15.0-1078-raspi2, linux-image-azure, linux-image-oracle, linux-image-azure-edge, linux-gke-4.15, linux-kvm, linux-image-gke-4.15, linux-image-oracle-lts-18.04, linux-image-4.15.0-1093-aws, linux-image-4.15.0-1106-azure, linux-image-4.15.0-1084-kvm, linux-image-gcp, linux-image-raspi2, linux-image-aws-lts-18.04, linux-image-4.15.0-1092-gcp, linux-snapdragon, linux-image-4.15.0-1064-oracle, linux-azure
  • USN-4751-1: linux-image-raspi, linux-image-generic-64k, linux-image-5.8.0-1016-raspi, linux-image-5.8.0-1023-gcp, linux-image-5.8.0-1024-aws, linux-image-5.8.0-44-generic, linux-image-generic-hwe-20.04, linux-image-gke, linux-image-kvm, linux-image-raspi-nolpae, linux-gcp, linux-image-virtual-hwe-20.04, linux-image-oem-20.04, linux-image-5.8.0-1021-oracle, linux-image-lowlatency, linux-aws, linux-oracle, linux-image-generic-64k-hwe-20.04, linux-image-5.8.0-1023-azure, linux-image-aws, linux-image-5.8.0-1019-kvm, linux-image-virtual-hwe-20.04-edge, linux-image-azure, linux-image-oracle, linux-image-generic-lpae-hwe-20.04, linux-image-generic-64k-hwe-20.04-edge, linux-image-5.8.0-44-lowlatency, linux-image-generic-lpae-hwe-20.04-edge, linux-kvm, linux-raspi, linux-image-generic-hwe-20.04-edge, linux-hwe-5.8, linux-image-virtual, linux-image-lowlatency-hwe-20.04-edge, linux-image-gcp, linux-image-5.8.0-44-generic-64k, linux-image-generic-lpae, linux-image-5.8.0-44-generic-lpae, linux-image-generic, linux-image-lowlatency-hwe-20.04, linux-image-5.8.0-1016-raspi-nolpae, linux, linux-azure
  • USN-4752-1: linux-image-5.6.0-1048-oem, linux-oem-5.6, linux-image-oem-20.04

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