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USN-4876-1: Linux kernel vulnerabilities

16 March 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

Details

Olivier Benjamin and Pawel Wieczorkiewicz discovered a race condition the
Xen paravirt block backend in the Linux kernel, leading to a use-after-free
vulnerability. An attacker in a guest VM could use this to cause a denial
of service in the host OS. (CVE-2020-29569)

It was discovered that the Marvell WiFi-Ex device driver in the Linux
kernel did not properly validate ad-hoc SSIDs. A local attacker could use
this to cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2020-36158)

吴异 discovered that the NFS implementation in the Linux kernel did not
properly prevent access outside of an NFS export that is a subdirectory of
a file system. An attacker could possibly use this to bypass NFS access
restrictions. (CVE-2021-3178)

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 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-4749-1: linux-kvm, linux-image-virtual, linux-image-generic-lpae, linux-image-azure-lts-18.04, linux-image-4.15.0-1079-gke, linux-image-raspi2, linux-image-4.15.0-1012-dell300x, linux-gke-4.15, linux-image-virtual-hwe-16.04-edge, linux-image-azure, linux-image-4.15.0-136-lowlatency, linux-image-gcp, linux-image-4.15.0-1085-kvm, linux-azure-4.15, linux-image-gcp-lts-18.04, linux-dell300x, linux-image-4.15.0-1093-gcp, linux-image-generic-hwe-16.04, linux-image-aws-lts-18.04, linux-image-oracle, linux-aws, linux-image-4.15.0-1079-raspi2, linux-image-4.15.0-1108-azure, linux-azure, linux-aws-hwe, linux-image-kvm, linux-gcp, linux-image-4.15.0-136-generic, linux-image-generic, linux-image-generic-lpae-hwe-16.04, linux-snapdragon, linux-image-oracle-lts-18.04, linux-image-4.15.0-136-generic-lpae, linux-image-4.15.0-1094-aws, linux-image-lowlatency, linux-image-virtual-hwe-16.04, linux-raspi2, linux-gcp-4.15, linux-oracle, linux-hwe, linux-image-4.15.0-1065-oracle, linux-image-lowlatency-hwe-16.04, linux-image-aws-hwe, linux, linux-image-snapdragon, linux-image-generic-hwe-16.04-edge, linux-image-lowlatency-hwe-16.04-edge, linux-image-gke, linux-image-4.15.0-1096-snapdragon, linux-image-gke-4.15, linux-image-dell300x, linux-image-oem, linux-image-azure-edge, linux-image-generic-lpae-hwe-16.04-edge
  • USN-4750-1: linux-kvm, linux-image-virtual, linux-image-generic-lpae, linux-image-5.4.0-1037-gcp, linux-image-5.4.0-66-generic, linux-image-oracle-edge, linux-image-raspi2-hwe-18.04, linux-image-generic-hwe-18.04-edge, linux-image-5.4.0-1010-gkeop, linux-image-gkeop, linux-image-raspi2, linux-image-5.4.0-1029-raspi, linux-image-5.4.0-1038-aws, linux-image-raspi, linux-image-azure, linux-image-snapdragon-hwe-18.04, linux-image-gcp, linux-image-5.4.0-66-generic-lpae, linux-image-gkeop-5.4, linux-hwe-5.4, linux-image-5.4.0-1040-azure, linux-image-oracle, linux-image-raspi-hwe-18.04, linux-gkeop-5.4, linux-image-oem-osp1, linux-image-5.4.0-1036-gke, linux-image-raspi-hwe-18.04-edge, linux-aws, linux-image-virtual-hwe-18.04, linux-image-gcp-edge, linux-image-5.4.0-1033-kvm, linux-gkeop, linux-azure, linux-azure-5.4, linux-image-kvm, linux-image-lowlatency-hwe-18.04-edge, linux-image-lowlatency-hwe-18.04, linux-gcp, linux-image-generic, linux-image-aws, linux-image-aws-edge, linux-aws-5.4, linux-gcp-5.4, linux-image-5.4.0-1038-oracle, linux-gke-5.4, linux-image-lowlatency, linux-image-generic-lpae-hwe-18.04, linux-oracle-5.4, linux-image-5.4.0-66-lowlatency, linux-oracle, linux-image-snapdragon-hwe-18.04-edge, linux-image-gke-5.4, linux, linux-raspi, linux-image-generic-hwe-18.04, linux-image-raspi2-hwe-18.04-edge, linux-image-oem, linux-image-virtual-hwe-18.04-edge, linux-image-generic-lpae-hwe-18.04-edge, linux-raspi-5.4, linux-image-azure-edge
  • USN-4751-1: linux-kvm, linux-image-virtual, linux-image-generic-lpae, linux-image-generic-64k-hwe-20.04-edge, linux-image-generic-lpae-hwe-20.04, linux-image-generic-lpae-hwe-20.04-edge, linux-image-virtual-hwe-20.04-edge, linux-image-raspi, linux-image-azure, linux-image-5.8.0-44-generic, linux-image-gcp, linux-image-5.8.0-1023-gcp, linux-image-generic-64k, linux-image-generic-hwe-20.04-edge, linux-image-oracle, linux-image-generic-64k-hwe-20.04, linux-image-raspi-nolpae, linux-image-5.8.0-44-generic-64k, linux-aws, linux-azure, linux-image-kvm, linux-image-lowlatency-hwe-20.04-edge, linux-image-5.8.0-1021-oracle, linux-image-5.8.0-1016-raspi, linux-image-oem-20.04, linux-image-generic-hwe-20.04, linux-gcp, linux-image-generic, linux-image-lowlatency-hwe-20.04, linux-image-aws, linux-image-virtual-hwe-20.04, linux-hwe-5.8, linux-image-5.8.0-1023-azure, linux-image-lowlatency, linux-oracle, linux-image-5.8.0-1024-aws, linux, linux-raspi, linux-image-5.8.0-44-generic-lpae, linux-image-5.8.0-1019-kvm, linux-image-gke, linux-image-5.8.0-44-lowlatency, linux-image-5.8.0-1016-raspi-nolpae
  • USN-4877-1: linux-kvm, linux-image-4.15.0-1086-kvm, linux-image-virtual, linux-image-generic-lpae, linux-image-azure-lts-18.04, linux-image-raspi2, linux-image-virtual-hwe-16.04-edge, linux-image-azure, linux-image-4.15.0-1095-aws, linux-image-gcp, linux-azure-4.15, linux-image-gcp-lts-18.04, linux-dell300x, linux-image-4.15.0-137-generic, linux-image-generic-hwe-16.04, linux-image-aws-lts-18.04, linux-image-oracle, linux-image-4.15.0-1066-oracle, linux-aws, linux-image-4.15.0-137-lowlatency, linux-image-4.15.0-1094-gcp, linux-image-4.15.0-137-generic-lpae, linux-azure, linux-image-kvm, linux-image-4.15.0-1097-snapdragon, linux-aws-hwe, linux-gcp, linux-image-generic, linux-image-generic-lpae-hwe-16.04, linux-snapdragon, linux-image-4.15.0-1080-raspi2, linux-image-oracle-lts-18.04, linux-image-4.15.0-1013-dell300x, linux-image-lowlatency, linux-image-virtual-hwe-16.04, linux-raspi2, linux-gcp-4.15, linux-oracle, linux-hwe, linux-image-lowlatency-hwe-16.04, linux-image-aws-hwe, linux, linux-image-4.15.0-1109-azure, linux-image-snapdragon, linux-image-generic-hwe-16.04-edge, linux-image-lowlatency-hwe-16.04-edge, linux-image-gke, linux-image-dell300x, linux-image-oem, linux-image-azure-edge, linux-image-generic-lpae-hwe-16.04-edge
  • USN-4878-1: linux-image-5.4.0-1039-aws, linux-image-5.4.0-1030-raspi, linux-image-5.4.0-1041-azure, linux-kvm, linux-image-virtual, linux-image-generic-lpae, linux-image-oracle-edge, linux-image-raspi2-hwe-18.04, linux-image-generic-hwe-18.04-edge, linux-image-gkeop, linux-image-raspi2, linux-image-raspi, linux-image-azure, linux-image-snapdragon-hwe-18.04, linux-image-5.4.0-67-lowlatency, linux-image-gcp, linux-image-5.4.0-1037-gke, linux-hwe-5.4, linux-image-gkeop-5.4, linux-image-oracle, linux-image-raspi-hwe-18.04, linux-gkeop-5.4, linux-image-oem-osp1, linux-image-raspi-hwe-18.04-edge, linux-aws, linux-image-5.4.0-67-generic, linux-image-virtual-hwe-18.04, linux-image-gcp-edge, linux-gkeop, linux-azure, linux-azure-5.4, linux-image-kvm, linux-image-lowlatency-hwe-18.04-edge, linux-image-lowlatency-hwe-18.04, linux-gcp, linux-image-generic, linux-image-aws, linux-image-aws-edge, linux-aws-5.4, linux-gcp-5.4, linux-image-5.4.0-1038-gcp, linux-gke-5.4, linux-image-lowlatency, linux-image-5.4.0-67-generic-lpae, linux-image-generic-lpae-hwe-18.04, linux-oracle-5.4, linux-oracle, linux-image-snapdragon-hwe-18.04-edge, linux-image-5.4.0-1039-oracle, linux-image-gke-5.4, linux-image-5.4.0-1011-gkeop, linux, linux-raspi, linux-image-generic-hwe-18.04, linux-image-raspi2-hwe-18.04-edge, linux-image-5.4.0-1034-kvm, linux-image-oem, linux-image-virtual-hwe-18.04-edge, linux-image-generic-lpae-hwe-18.04-edge, linux-raspi-5.4, linux-image-azure-edge
  • USN-4910-1: linux-kvm, linux-image-5.8.0-1025-oracle, linux-image-virtual, linux-image-5.8.0-1023-kvm, linux-image-generic-64k-hwe-20.04-edge, linux-image-generic-lpae, linux-image-generic-lpae-hwe-20.04, linux-image-generic-lpae-hwe-20.04-edge, linux-image-5.8.0-49-lowlatency, linux-image-virtual-hwe-20.04-edge, linux-image-5.8.0-1020-raspi-nolpae, linux-image-raspi, linux-image-azure, linux-image-gcp, linux-image-5.8.0-1027-gcp, linux-image-generic-64k, linux-image-generic-hwe-20.04-edge, linux-image-oracle, linux-image-generic-64k-hwe-20.04, linux-image-5.8.0-49-generic, linux-image-raspi-nolpae, linux-aws, linux-azure, linux-image-kvm, linux-image-lowlatency-hwe-20.04-edge, linux-image-5.8.0-1028-aws, linux-image-oem-20.04, linux-image-generic-hwe-20.04, linux-gcp, linux-image-generic, linux-image-lowlatency-hwe-20.04, linux-image-aws, linux-image-virtual-hwe-20.04, linux-hwe-5.8, linux-image-5.8.0-1027-azure, linux-image-lowlatency, linux-image-5.8.0-49-generic-64k, linux-image-5.8.0-1020-raspi, linux-oracle, linux, linux-raspi, linux-image-5.8.0-49-generic-lpae, linux-image-gke
  • USN-4912-1: linux-image-5.6.0-1053-oem, linux-oem-5.6, linux-image-oem-20.04
  • USN-4879-1: linux-kvm, linux-image-5.8.0-1024-azure, linux-image-virtual, linux-image-generic-lpae, linux-image-generic-64k-hwe-20.04-edge, linux-image-generic-lpae-hwe-20.04, linux-image-generic-lpae-hwe-20.04-edge, linux-image-virtual-hwe-20.04-edge, linux-image-5.8.0-1017-raspi, linux-image-raspi, linux-image-azure, linux-image-gcp, linux-image-generic-64k, linux-image-generic-hwe-20.04-edge, linux-image-oracle, linux-image-generic-64k-hwe-20.04, linux-image-5.8.0-45-generic-64k, linux-image-raspi-nolpae, linux-image-5.8.0-1020-kvm, linux-aws, linux-image-5.8.0-1022-oracle, linux-image-5.8.0-1024-gcp, linux-azure, linux-image-kvm, linux-image-lowlatency-hwe-20.04-edge, linux-image-oem-20.04, linux-image-generic-hwe-20.04, linux-gcp, linux-image-generic, linux-image-lowlatency-hwe-20.04, linux-image-aws, linux-image-virtual-hwe-20.04, linux-hwe-5.8, linux-image-lowlatency, linux-oracle, linux-image-5.8.0-45-generic, linux-image-5.8.0-1017-raspi-nolpae, linux, linux-image-5.8.0-1025-aws, linux-raspi, linux-image-5.8.0-45-lowlatency, linux-image-gke, linux-image-5.8.0-45-generic-lpae