USN-4983-1: Linux kernel (OEM) vulnerabilities

03 June 2021

Several security issues were fixed in the Linux kernel.

Releases

Packages

Details

Piotr Krysiuk discovered that the eBPF implementation in the Linux kernel
did not properly enforce limits for pointer operations. A local attacker
could use this to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2021-33200)

Piotr Krysiuk and Benedict Schlueter discovered that the eBPF
implementation in the Linux kernel performed out of bounds speculation on
pointer arithmetic. A local attacker could use this to expose sensitive
information. (CVE-2021-29155)

Piotr Krysiuk discovered that the eBPF implementation in the Linux kernel
did not properly prevent speculative loads in certain situations. A local
attacker could use this to expose sensitive information (kernel memory).
(CVE-2021-31829)

Reiji Watanabe discovered that the KVM VMX implementation in the Linux
kernel did not properly prevent user space from tampering with an array
index value, leading to a potential out-of-bounds write. A local attacker
could use this to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2021-3501)

Update instructions

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

Ubuntu 20.04

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-4999-1: linux, linux-oracle-5.8, linux-image-generic-64k-hwe-20.04-edge, linux-image-generic-64k-hwe-20.04, linux-gcp-5.8, linux-image-generic-64k, linux-image-lowlatency, linux-image-generic-lpae-hwe-20.04-edge, linux-image-kvm, linux-image-azure-edge, linux-image-5.8.0-59-generic, linux-image-virtual, linux-image-5.8.0-59-generic-64k, linux-image-raspi-nolpae, linux-image-generic-hwe-20.04, linux-image-virtual-hwe-20.04, linux-image-raspi, linux-image-5.8.0-1036-azure, linux-image-5.8.0-1038-aws, linux-kvm, linux-image-generic-hwe-20.04-edge, linux-image-gcp-edge, linux-raspi, linux-azure-5.8, linux-image-5.8.0-1029-raspi-nolpae, linux-azure, linux-image-aws, linux-image-oracle-edge, linux-image-oracle, linux-image-gcp, linux-image-generic-lpae-hwe-20.04, linux-oracle, linux-image-generic, linux-image-azure, linux-image-5.8.0-1035-gcp, linux-aws-5.8, linux-image-5.8.0-1029-raspi, linux-image-generic-lpae, linux-aws, linux-gcp, linux-image-lowlatency-hwe-20.04-edge, linux-image-oem-20.04, linux-hwe-5.8, linux-image-5.8.0-1033-oracle, linux-image-5.8.0-59-generic-lpae, linux-image-5.8.0-59-lowlatency, linux-image-gke, linux-image-lowlatency-hwe-20.04, linux-image-5.8.0-1030-kvm, linux-image-virtual-hwe-20.04-edge
  • USN-4997-1: linux, linux-image-generic-64k-hwe-20.04-edge, linux-image-5.11.0-1010-oracle, linux-image-5.11.0-1011-gcp, linux-image-generic-64k-hwe-20.04, linux-image-generic-64k, linux-image-lowlatency, linux-image-generic-lpae-hwe-20.04-edge, linux-image-5.11.0-1012-raspi, linux-image-virtual, linux-image-raspi-nolpae, linux-image-virtual-hwe-20.04, linux-image-generic-hwe-20.04, linux-image-raspi, linux-image-5.11.0-1009-azure, linux-image-5.11.0-22-generic, linux-image-5.11.0-1011-aws, linux-image-generic-hwe-20.04-edge, linux-image-5.11.0-22-generic-64k, linux-raspi, linux-azure, linux-image-aws, linux-image-5.11.0-22-lowlatency, linux-image-oracle, linux-image-gcp, linux-image-generic-lpae-hwe-20.04, linux-oracle, linux-image-generic, linux-image-azure, linux-image-5.11.0-1012-raspi-nolpae, linux-image-generic-lpae, linux-aws, linux-gcp, linux-image-lowlatency-hwe-20.04-edge, linux-image-5.11.0-22-generic-lpae, linux-image-oem-20.04, linux-image-gke, linux-image-lowlatency-hwe-20.04, linux-image-virtual-hwe-20.04-edge
  • USN-5000-1: linux, linux-gcp-5.4, linux-image-generic-hwe-18.04-edge, linux-azure-5.4, linux-image-5.4.0-1038-raspi, linux-image-raspi2-hwe-18.04, linux-image-lowlatency, linux-image-5.4.0-1046-gcp, linux-gkeop, linux-image-5.4.0-77-generic-lpae, linux-image-azure-lts-20.04, linux-gke, linux-image-gke-5.4, linux-image-raspi2, linux-image-raspi-hwe-18.04, linux-image-5.4.0-1046-gke, linux-image-generic-lpae-hwe-18.04-edge, linux-image-azure-edge, linux-oracle-5.4, linux-gke-5.4, linux-image-5.4.0-1051-aws, linux-aws-5.4, linux-image-oem-osp1, linux-image-gkeop-5.4, linux-image-virtual, linux-image-5.4.0-77-generic, linux-image-oracle-lts-20.04, linux-image-raspi, linux-image-raspi-hwe-18.04-edge, linux-image-aws-edge, linux-image-gkeop, linux-image-gcp-edge, linux-image-5.4.0-1051-azure, linux-image-5.4.0-1048-oracle, linux-image-5.4.0-1018-gkeop, linux-hwe-5.4, linux-raspi, linux-azure, linux-image-aws, linux-image-gcp-lts-20.04, linux-image-snapdragon-hwe-18.04, linux-image-oracle-edge, linux-image-lowlatency-hwe-18.04, linux-image-oracle, linux-image-snapdragon-hwe-18.04-edge, linux-image-gcp, linux-image-virtual-hwe-18.04, linux-oracle, linux-image-generic-hwe-18.04, linux-image-generic, linux-image-azure, linux-image-5.4.0-77-lowlatency, linux-image-lowlatency-hwe-18.04-edge, linux-image-oem, linux-raspi-5.4, linux-image-generic-lpae, linux-aws, linux-gcp, linux-image-virtual-hwe-18.04-edge, linux-image-raspi2-hwe-18.04-edge, linux-image-generic-lpae-hwe-18.04, linux-image-gke, linux-gkeop-5.4, linux-image-aws-lts-20.04
  • USN-4977-1: linux, linux-image-generic-64k-hwe-20.04-edge, linux-image-generic-64k-hwe-20.04, linux-image-5.11.0-18-generic-64k, linux-image-generic-64k, linux-image-lowlatency, linux-image-generic-lpae-hwe-20.04-edge, linux-image-kvm, linux-image-5.11.0-1008-aws, linux-image-5.11.0-1009-raspi, linux-image-virtual, linux-image-5.11.0-1009-raspi-nolpae, linux-image-raspi-nolpae, linux-image-virtual-hwe-20.04, linux-image-generic-hwe-20.04, linux-image-raspi, linux-kvm, linux-image-generic-hwe-20.04-edge, linux-raspi, linux-image-5.11.0-1006-azure, linux-azure, linux-image-aws, linux-image-oracle, linux-image-gcp, linux-image-generic-lpae-hwe-20.04, linux-oracle, linux-image-5.11.0-18-lowlatency, linux-image-azure, linux-image-generic, linux-image-generic-lpae, linux-aws, linux-gcp, linux-image-5.11.0-1008-gcp, linux-image-5.11.0-18-generic, linux-image-lowlatency-hwe-20.04-edge, linux-image-oem-20.04, linux-image-5.11.0-18-generic-lpae, linux-image-5.11.0-1007-oracle, linux-image-gke, linux-image-lowlatency-hwe-20.04, linux-image-5.11.0-1008-kvm, linux-image-virtual-hwe-20.04-edge