USN-4878-1: Linux kernel vulnerabilities

16 March 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-5.4 - Linux kernel for Amazon Web Services (AWS) systems
  • linux-azure - Linux kernel for Microsoft Azure Cloud systems
  • linux-azure-5.4 - Linux kernel for Microsoft Azure cloud systems
  • linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-gcp-5.4 - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-gke-5.4 - Linux kernel for Google Container Engine (GKE) systems
  • linux-gkeop - Linux kernel for Google Container Engine (GKE) systems
  • linux-gkeop-5.4 - Linux kernel for Google Container Engine (GKE) systems
  • linux-hwe-5.4 - Linux hardware enablement (HWE) kernel
  • linux-kvm - Linux kernel for cloud environments
  • linux-oracle - Linux kernel for Oracle Cloud systems
  • linux-oracle-5.4 - Linux kernel for Oracle Cloud systems
  • linux-raspi - Linux kernel for Raspberry Pi (V8) systems
  • linux-raspi-5.4 - Linux kernel for Raspberry Pi (V8) systems

Details

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)

Ryota Shiga discovered that the sockopt BPF hooks in the Linux kernel could
allow a user space program to probe for valid kernel addresses. A local
attacker could use this to ease exploitation of another kernel
vulnerability. (CVE-2021-20239)

It was discovered that the priority inheritance futex implementation in the
Linux kernel contained a race condition, leading to a use-after-free
vulnerability. A local attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2021-3347)

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)

Update instructions

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

Ubuntu 20.04
Ubuntu 18.04

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-4910-1: linux-kvm, linux-raspi, linux-hwe-5.8, linux-oracle, linux-image-kvm, linux-image-raspi-nolpae, linux-azure, linux-image-aws, linux-image-generic-lpae, linux-image-5.8.0-1027-azure, linux-aws, linux-image-gke, linux-image-5.8.0-1023-kvm, linux-image-oem-20.04, linux, linux-image-raspi, linux-image-generic-64k-hwe-20.04, linux-image-5.8.0-1020-raspi-nolpae, linux-image-gcp, linux-image-5.8.0-1027-gcp, linux-image-virtual, linux-image-generic-lpae-hwe-20.04, linux-image-5.8.0-1028-aws, linux-image-oracle, linux-image-5.8.0-49-generic-64k, linux-image-lowlatency, linux-image-5.8.0-49-lowlatency, linux-gcp, linux-image-virtual-hwe-20.04, linux-image-generic, linux-image-generic-64k, linux-image-generic-hwe-20.04, linux-image-lowlatency-hwe-20.04, linux-image-5.8.0-1020-raspi, linux-image-5.8.0-49-generic-lpae, linux-image-azure, linux-image-5.8.0-1025-oracle, linux-image-5.8.0-49-generic
  • USN-4877-1: linux-image-aws-lts-18.04, linux-image-generic-hwe-16.04, linux-kvm, linux-raspi2, linux-oracle, linux-image-aws-hwe, linux-image-kvm, linux-image-snapdragon, linux-gcp-4.15, linux-azure, linux-image-4.15.0-137-generic, linux-aws-hwe, linux-image-generic-lpae, linux-aws, linux-image-gke, linux-image-4.15.0-1094-gcp, linux-image-azure-lts-18.04, linux-image-4.15.0-1013-dell300x, linux-image-powerpc64-smp, linux-image-4.15.0-1086-kvm, linux-image-4.15.0-137-lowlatency, linux, linux-image-oracle-lts-18.04, linux-snapdragon, linux-image-virtual, linux-image-gcp, linux-image-4.15.0-1066-oracle, linux-image-powerpc-e500mc, linux-image-oracle, linux-image-generic-lpae-hwe-16.04, linux-image-lowlatency, linux-hwe, linux-image-dell300x, linux-image-oem, linux-image-raspi2, linux-image-powerpc64-emb, linux-gcp, linux-image-4.15.0-1095-aws, linux-image-gcp-lts-18.04, linux-image-generic, linux-azure-4.15, linux-image-4.15.0-1097-snapdragon, linux-image-powerpc-smp, linux-dell300x, linux-image-4.15.0-137-generic-lpae, linux-image-lowlatency-hwe-16.04, linux-image-4.15.0-1080-raspi2, linux-image-azure, linux-image-4.15.0-1109-azure, linux-image-virtual-hwe-16.04
  • USN-4912-1: linux-image-5.6.0-1053-oem, linux-image-oem-20.04, linux-oem-5.6
  • USN-4907-1: linux-image-aws-lts-18.04, linux-raspi2, linux-kvm, linux-oracle, linux-image-4.15.0-1089-kvm, linux-image-aws-hwe, linux-image-kvm, linux-image-snapdragon, linux-gcp-4.15, linux-image-4.15.0-1098-aws, linux-azure, linux-aws-hwe, linux-image-generic-lpae, linux-aws, linux-image-gke, linux-image-azure-lts-18.04, linux-image-4.15.0-141-generic-lpae, linux-image-powerpc64-smp, linux-image-4.15.0-1016-dell300x, linux-snapdragon, linux, linux-image-4.15.0-1097-gcp, linux-image-oracle-lts-18.04, linux-image-virtual, linux-image-gcp, linux-image-4.15.0-141-lowlatency, linux-image-powerpc-e500mc, linux-image-oracle, linux-image-4.15.0-141-generic, linux-image-lowlatency, linux-image-dell300x, linux-image-raspi2, linux-image-4.15.0-1083-raspi2, linux-image-powerpc64-emb, linux-gcp, linux-image-gcp-lts-18.04, linux-image-generic, linux-azure-4.15, linux-image-powerpc-smp, linux-dell300x, linux-image-4.15.0-1069-oracle, linux-image-4.15.0-1100-snapdragon, linux-image-4.15.0-1112-azure, linux-image-azure
  • USN-4884-1: linux-image-5.10.0-1017-oem, linux-oem-5.10, linux-image-oem-20.04b
  • USN-4879-1: linux-kvm, linux-raspi, linux-hwe-5.8, linux-oracle, linux-image-5.8.0-1020-kvm, linux-image-kvm, linux-image-raspi-nolpae, linux-image-5.8.0-1024-azure, linux-azure, linux-image-aws, linux-image-5.8.0-1017-raspi, linux-image-generic-lpae, linux-aws, linux-image-gke, linux-image-oem-20.04, linux, linux-image-raspi, linux-image-generic-64k-hwe-20.04, linux-image-5.8.0-45-lowlatency, linux-image-virtual, linux-image-gcp, linux-image-5.8.0-1025-aws, linux-image-generic-lpae-hwe-20.04, linux-image-5.8.0-45-generic, linux-image-oracle, linux-image-5.8.0-45-generic-64k, linux-image-lowlatency, linux-gcp, linux-image-5.8.0-1024-gcp, linux-image-virtual-hwe-20.04, linux-image-generic, linux-image-generic-64k, linux-image-generic-hwe-20.04, linux-image-lowlatency-hwe-20.04, linux-image-5.8.0-1017-raspi-nolpae, linux-image-5.8.0-1022-oracle, linux-image-azure, linux-image-5.8.0-45-generic-lpae
  • USN-4876-1: linux-raspi2, linux-kvm, linux-image-4.4.0-204-generic, linux-image-kvm, linux-image-snapdragon, linux-image-aws, linux-image-4.4.0-204-lowlatency, linux-image-generic-lpae, linux-aws, linux-image-4.4.0-1147-raspi2, linux-image-4.4.0-1089-kvm, linux-image-powerpc64-smp, linux-snapdragon, linux, linux-image-virtual, linux-image-powerpc64-smp-lts-xenial, linux-image-4.4.0-1087-aws, linux-image-generic-lts-xenial, linux-image-generic-lpae-lts-xenial, linux-image-powerpc-e500mc-lts-xenial, linux-lts-xenial, linux-image-powerpc-e500mc, linux-image-4.4.0-204-powerpc-smp, linux-image-4.4.0-204-powerpc-e500mc, linux-image-4.4.0-204-powerpc64-emb, linux-image-lowlatency-lts-xenial, linux-image-virtual-lts-xenial, linux-image-lowlatency, linux-image-raspi2, linux-image-powerpc64-emb, linux-image-4.4.0-1151-snapdragon, linux-image-4.4.0-1123-aws, linux-image-generic, linux-image-powerpc-smp, linux-image-4.4.0-204-generic-lpae, linux-image-powerpc-smp-lts-xenial, linux-image-powerpc64-emb-lts-xenial, linux-image-4.4.0-204-powerpc64-smp