USN-5003-1: Linux kernel vulnerabilities

23 June 2021

Several security issues were fixed in the Linux kernel.

Releases

Packages

  • linux - Linux kernel
  • 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-dell300x - Linux kernel for Dell 300x platforms
  • linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-gcp-4.15 - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-hwe - Linux hardware enablement (HWE) kernel
  • 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

Norbert Slusarek discovered a race condition in the CAN BCM networking
protocol of the Linux kernel leading to multiple use-after-free
vulnerabilities. A local attacker could use this issue to execute arbitrary
code. (CVE-2021-3609)

It was discovered that the eBPF implementation in the Linux kernel did not
properly track bounds information for 32 bit registers when performing div
and mod operations. A local attacker could use this to possibly execute
arbitrary code. (CVE-2021-3600)

Or Cohen discovered that the SCTP implementation in the Linux kernel
contained a race condition in some situations, leading to a use-after-free
condition. A local attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2021-23133)

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-4999-1: linux-image-5.8.0-1033-oracle, linux-image-5.8.0-1035-gcp, linux-image-5.8.0-59-lowlatency, linux-image-generic-lpae, linux-image-virtual, linux-image-lowlatency, linux-oracle, linux-image-oem-20.04, linux-image-5.8.0-1029-raspi, linux-image-lowlatency-hwe-20.04, linux-image-gke, linux-image-5.8.0-59-generic-64k, linux-image-azure, linux-image-generic-64k, linux-image-generic-hwe-20.04, linux-image-5.8.0-1029-raspi-nolpae, linux-oracle-5.8, linux-image-virtual-hwe-20.04-edge, linux-image-gcp-edge, linux-image-oracle, linux-image-kvm, linux-image-5.8.0-1030-kvm, linux-gcp-5.8, linux, linux-image-5.8.0-59-generic-lpae, linux-azure, linux-image-gcp, linux-image-generic-64k-hwe-20.04, linux-azure-5.8, linux-image-raspi, linux-image-generic-lpae-hwe-20.04-edge, linux-image-generic-hwe-20.04-edge, linux-image-lowlatency-hwe-20.04-edge, linux-image-raspi-nolpae, linux-image-generic-64k-hwe-20.04-edge, linux-hwe-5.8, linux-image-aws, linux-image-5.8.0-1038-aws, linux-raspi, linux-aws-5.8, linux-image-virtual-hwe-20.04, linux-gcp, linux-image-generic, linux-image-oracle-edge, linux-aws, linux-image-azure-edge, linux-image-5.8.0-1036-azure, linux-image-generic-lpae-hwe-20.04, linux-kvm, linux-image-5.8.0-59-generic
  • USN-5002-1: linux-image-5.3.0-75-generic, linux-image-5.3.0-1044-gke, linux-image-raspi2-hwe-18.04, linux-gke-5.3, linux-hwe, linux-image-gkeop-5.3, linux-raspi2-5.3, linux-image-5.3.0-75-lowlatency, linux-image-gke-5.3, linux-image-5.3.0-1041-raspi2
  • USN-5000-1: linux-image-generic-lpae, linux-image-oracle-lts-20.04, linux-aws-5.4, linux-image-oem, linux-image-gcp-lts-20.04, linux-image-gke-5.4, linux-image-lowlatency, linux-image-virtual, linux-oracle, linux-oracle-5.4, linux-image-gke, linux-image-raspi2, linux-image-raspi2-hwe-18.04-edge, linux-raspi-5.4, linux-image-azure, linux-image-lowlatency-hwe-18.04-edge, linux-image-5.4.0-1046-gcp, linux-image-5.4.0-1046-gke, linux-image-5.4.0-77-generic, linux-image-5.4.0-77-generic-lpae, linux-gke-5.4, linux-image-gcp-edge, linux-image-5.4.0-77-lowlatency, linux-image-lowlatency-hwe-18.04, linux-image-oracle, linux-image-virtual-hwe-18.04, linux-image-generic-lpae-hwe-18.04, linux, linux-image-generic-hwe-18.04, linux-azure, linux-image-gcp, linux-image-gkeop, linux-image-generic-lpae-hwe-18.04-edge, linux-image-snapdragon-hwe-18.04, linux-image-aws-edge, linux-image-aws-lts-20.04, linux-image-5.4.0-1051-azure, linux-image-raspi, linux-image-snapdragon-hwe-18.04-edge, linux-image-5.4.0-1018-gkeop, linux-image-raspi-hwe-18.04-edge, linux-gcp-5.4, linux-image-aws, linux-image-5.4.0-1051-aws, linux-image-5.4.0-1048-oracle, linux-gkeop-5.4, linux-raspi, linux-gke, linux-gcp, linux-image-generic, linux-image-oracle-edge, linux-azure-5.4, linux-aws, linux-hwe-5.4, linux-image-5.4.0-1038-raspi, linux-image-raspi2-hwe-18.04, linux-image-azure-edge, linux-image-azure-lts-20.04, linux-image-gkeop-5.4, linux-image-oem-osp1, linux-image-raspi-hwe-18.04, linux-image-generic-hwe-18.04-edge, linux-image-virtual-hwe-18.04-edge, linux-gkeop
  • USN-5000-2: linux-image-5.4.0-1041-kvm, linux-tools-5.4.0-1041-kvm, linux-modules-5.4.0-1041-kvm, linux-buildinfo-5.4.0-1041-kvm, linux-image-kvm, linux-headers-5.4.0-1041-kvm, linux-kvm, linux-headers-kvm, linux-tools-kvm, linux-image-unsigned-5.4.0-1041-kvm, linux-kvm-tools-5.4.0-1041, linux-kvm-headers-5.4.0-1041
  • USN-4997-2: linux-buildinfo-5.11.0-1009-kvm, linux-tools-5.11.0-1009-kvm, linux-image-5.11.0-1009-kvm, linux-modules-5.11.0-1009-kvm, linux-kvm-headers-5.11.0-1009, linux-kvm-tools-5.11.0-1009, linux-image-kvm, linux-image-unsigned-5.11.0-1009-kvm, linux-kvm, linux-headers-kvm, linux-tools-kvm, linux-headers-5.11.0-1009-kvm
  • USN-5001-1: linux-image-oem-20.04b, linux-oem-5.10, linux-image-oem-20.04-edge, linux-image-5.10.0-1033-oem, linux-image-oem-20.04
  • USN-4997-1: linux-image-generic-lpae, linux-image-virtual, linux-image-lowlatency, linux-oracle, linux-image-5.11.0-1010-oracle, linux-image-lowlatency-hwe-20.04, linux-image-oem-20.04, linux-image-gke, linux-image-generic-64k, linux-image-azure, linux-image-5.11.0-1011-gcp, linux-image-generic-hwe-20.04, linux-image-virtual-hwe-20.04-edge, linux-image-oracle, linux-image-5.11.0-1012-raspi-nolpae, linux, linux-image-gcp, linux-azure, linux-image-generic-64k-hwe-20.04, linux-image-5.11.0-22-generic-lpae, linux-image-5.11.0-22-generic, linux-image-raspi, linux-image-5.11.0-1012-raspi, linux-image-generic-lpae-hwe-20.04-edge, linux-image-generic-hwe-20.04-edge, linux-image-lowlatency-hwe-20.04-edge, linux-image-raspi-nolpae, linux-image-generic-64k-hwe-20.04-edge, linux-image-aws, linux-image-5.11.0-1009-azure, linux-raspi, linux-image-virtual-hwe-20.04, linux-gcp, linux-image-generic, linux-image-5.11.0-1011-aws, linux-aws, linux-image-5.11.0-22-lowlatency, linux-image-generic-lpae-hwe-20.04, linux-image-5.11.0-22-generic-64k
  • USN-5082-1: linux-oem-5.13-headers-5.13.0-1012, linux-headers-5.13.0-1012-oem, linux-image-unsigned-5.13.0-1012-oem, linux-modules-5.13.0-1012-oem, linux-oem-5.13-tools-5.13.0-1012, linux-tools-5.13.0-1012-oem, linux-buildinfo-5.13.0-1012-oem, linux-oem-5.13-tools-host, linux-headers-oem-20.04c, linux-image-5.13.0-1012-oem, linux-oem-20.04c, linux-image-oem-20.04c, linux-oem-5.13, linux-tools-oem-20.04c
  • LSN-0079-1: gkeop, gcp, lowlatency-4.15, lowlatency-4.4, gke-4.15, gke-5.4, generic-5.4, gkeop-5.4, generic-4.4, lowlatency-5.4, gke, generic-4.15, oem
  • LSN-0078-1: gkeop, gcp, lowlatency-4.15, gke-4.15, gke-5.4, generic-5.4, gkeop-5.4, lowlatency-5.4, gke, generic-4.15, oem