USN-4945-1: Linux kernel vulnerabilities

11 May 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 - Linux kernel for Google Container Engine (GKE) 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

Details

It was discovered that the Nouveau GPU driver in the Linux kernel did not
properly handle error conditions in some situations. A local attacker could
use this to cause a denial of service (system crash). (CVE-2020-25639)

Jan Beulich discovered that the Xen netback backend in the Linux kernel did
not properly handle certain error conditions under paravirtualization. An
attacker in a guest VM could possibly use this to cause a denial of service
(host domain crash). (CVE-2021-28038)

It was discovered that the fastrpc driver in the Linux kernel did not
prevent user space applications from sending kernel RPC messages. A local
attacker could possibly use this to gain elevated privileges.
(CVE-2021-28375)

It was discovered that the Realtek RTL8188EU Wireless device driver in the
Linux kernel did not properly validate ssid lengths in some situations. An
attacker could use this to cause a denial of service (system crash).
(CVE-2021-28660)

It was discovered that the USB/IP driver in the Linux kernel contained race
conditions during the update of local and shared status. An attacker could
use this to cause a denial of service (system crash). (CVE-2021-29265)

It was discovered that a race condition existed in the netfilter subsystem
of the Linux kernel when replacing tables. A local attacker could use this
to cause a denial of service (system crash). (CVE-2021-29650)

Arnd Bergmann discovered that the video4linux subsystem in the Linux kernel
did not properly deallocate memory in some situations. A local attacker
could use this to cause a denial of service (memory exhaustion).
(CVE-2021-30002)

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-4911-1: linux-oem-5.10, linux-image-oem-20.04-edge, linux-image-5.10.0-1021-oem, linux-image-oem-20.04b
  • USN-4949-1: linux-image-raspi-nolpae, linux-image-generic-lpae-hwe-20.04-edge, linux-image-5.8.0-1033-aws, linux-image-aws, linux-image-5.8.0-1029-oracle, linux-image-5.8.0-53-generic-lpae, linux-kvm, linux-image-raspi, linux-image-5.8.0-53-generic-64k, linux-raspi, linux-image-generic-lpae, linux-azure, linux-gcp, linux-image-5.8.0-53-lowlatency, linux-image-oracle, linux-image-gcp, linux-image-generic-lpae-hwe-20.04, linux-hwe-5.8, linux-image-azure, linux-oracle, linux-aws, linux, linux-image-virtual, linux-image-virtual-hwe-20.04, linux-image-generic-64k-hwe-20.04, linux-image-lowlatency-hwe-20.04, linux-image-generic-64k, linux-image-lowlatency, linux-image-virtual-hwe-20.04-edge, linux-image-kvm, linux-image-5.8.0-1027-kvm, linux-image-5.8.0-1024-raspi-nolpae, linux-image-generic-hwe-20.04-edge, linux-image-lowlatency-hwe-20.04-edge, linux-image-generic-64k-hwe-20.04-edge, linux-image-oem-20.04, linux-image-5.8.0-1032-azure, linux-image-5.8.0-1024-raspi, linux-image-generic-hwe-20.04, linux-image-gke, linux-image-5.8.0-53-generic, linux-image-generic, linux-image-5.8.0-1031-gcp
  • USN-4946-1: linux-image-4.15.0-1018-dell300x, linux-gcp-4.15, linux-image-aws-lts-18.04, linux-image-generic, linux-image-generic-hwe-16.04, linux-image-generic-lpae-hwe-16.04-edge, linux-image-snapdragon, linux-image-virtual-hwe-16.04-edge, linux-raspi2, linux-dell300x, linux-image-generic-lpae-hwe-16.04, linux-azure-4.15, linux-image-oracle-lts-18.04, linux-hwe, linux-image-4.15.0-1071-oracle, linux-image-generic-hwe-16.04-edge, linux-kvm, linux-image-dell300x, linux-snapdragon, linux-aws-hwe, linux-image-4.15.0-143-generic-lpae, linux-image-generic-lpae, linux-azure, linux-image-4.15.0-1091-kvm, linux-gcp, linux-image-gcp-lts-18.04, linux-image-oem, linux-image-oracle, linux-image-gcp, linux-oracle, linux-image-aws-hwe, linux-image-azure, linux-aws, linux-image-azure-lts-18.04, linux-image-4.15.0-143-lowlatency, linux, linux-image-virtual, linux-image-4.15.0-1099-gcp, linux-image-4.15.0-143-generic, linux-image-lowlatency-hwe-16.04-edge, linux-image-raspi2, linux-image-lowlatency, linux-image-kvm, linux-image-4.15.0-1114-azure, linux-image-4.15.0-1102-snapdragon, linux-image-virtual-hwe-16.04, linux-image-gke, linux-image-lowlatency-hwe-16.04, linux-image-4.15.0-1085-raspi2, linux-image-4.15.0-1102-aws
  • USN-4984-1: linux-image-5.8.0-55-generic, linux-image-generic-lpae-hwe-20.04-edge, linux-image-raspi-nolpae, linux-image-aws, linux-image-5.8.0-55-generic-64k, linux-kvm, linux-image-5.8.0-1031-oracle, linux-image-raspi, linux-raspi, linux-image-5.8.0-1035-aws, linux-azure, linux-image-generic-lpae, linux-gcp, linux-image-oracle, linux-image-5.8.0-1026-raspi, linux-image-5.8.0-1028-kvm, linux-image-gcp, linux-image-generic-lpae-hwe-20.04, linux-hwe-5.8, linux-image-5.8.0-1026-raspi-nolpae, linux-image-azure, linux-aws, linux-oracle, linux, linux-image-virtual, linux-image-virtual-hwe-20.04, linux-image-generic-64k-hwe-20.04, linux-image-lowlatency-hwe-20.04, linux-image-5.8.0-1032-gcp, linux-image-generic-64k, linux-image-lowlatency, linux-image-virtual-hwe-20.04-edge, linux-image-kvm, linux-image-5.8.0-55-generic-lpae, linux-image-generic-hwe-20.04-edge, linux-image-lowlatency-hwe-20.04-edge, linux-image-generic-64k-hwe-20.04-edge, linux-image-oem-20.04, linux-image-5.8.0-55-lowlatency, linux-image-generic-hwe-20.04, linux-image-gke, linux-image-generic, linux-image-5.8.0-1033-azure
  • USN-4947-1: linux-image-oem-20.04, linux-image-5.6.0-1056-oem, linux-oem-5.6
  • USN-4904-1: linux-image-virtual-lts-vivid, linux-image-4.4.0-208-generic, linux-raspi2, linux-image-generic-lpae-lts-xenial, linux-image-powerpc64-emb-lts-wily, linux-image-powerpc64-smp-lts-utopic, linux-image-snapdragon, linux-image-generic-lts-vivid, linux-image-powerpc-smp-lts-wily, linux-image-powerpc64-smp-lts-xenial, linux-image-aws, linux-image-4.4.0-1091-kvm, linux-image-4.4.0-1150-raspi2, linux-image-generic-lpae-lts-wily, linux-image-powerpc64-emb-lts-xenial, linux-image-powerpc64-smp-lts-vivid, linux-image-lowlatency-lts-wily, linux-image-lowlatency-lts-vivid, linux-image-powerpc64-emb, linux-kvm, linux-image-4.4.0-208-powerpc64-emb, linux-image-generic-lpae-lts-utopic, linux-snapdragon, linux-image-generic-lpae, linux-image-4.4.0-208-powerpc64-smp, linux-image-4.4.0-208-powerpc-e500mc, linux-image-powerpc64-smp, linux-image-powerpc64-emb-lts-vivid, linux-image-lowlatency-lts-utopic, linux-aws, linux-image-powerpc-e500mc, linux, linux-image-virtual, linux-lts-xenial, linux-image-lowlatency-lts-xenial, linux-image-raspi2, linux-image-generic-lpae-lts-vivid, linux-image-4.4.0-1090-aws, linux-image-generic-lts-xenial, linux-image-lowlatency, linux-image-powerpc-smp, linux-image-kvm, linux-image-4.4.0-208-generic-lpae, linux-image-powerpc-e500mc-lts-utopic, linux-image-powerpc-e500mc-lts-wily, linux-image-generic-lts-wily, linux-image-virtual-lts-xenial, linux-image-4.4.0-208-powerpc-smp, linux-image-virtual-lts-utopic, linux-image-powerpc-smp-lts-utopic, linux-image-powerpc-e500mc-lts-xenial, linux-image-4.4.0-208-lowlatency, linux-image-powerpc-smp-lts-xenial, linux-image-virtual-lts-wily, linux-image-4.4.0-1154-snapdragon, linux-image-powerpc-smp-lts-vivid, linux-image-4.4.0-1126-aws, linux-image-generic-lts-utopic, linux-image-powerpc64-smp-lts-wily, linux-image-powerpc64-emb-lts-utopic, linux-image-generic, linux-image-powerpc-e500mc-lts-vivid
  • USN-4945-2: linux-image-raspi-hwe-18.04, linux-image-raspi2, linux-image-raspi2-hwe-18.04-edge, linux-image-raspi, linux-raspi, linux-raspi-5.4, linux-image-raspi-hwe-18.04-edge, linux-image-5.4.0-1035-raspi, linux-image-raspi2-hwe-18.04
  • USN-4948-1: linux-image-oem-20.04b, linux-image-oem-20.04-edge, linux-oem-5.10, linux-image-5.10.0-1026-oem
  • USN-4979-1: linux-image-aws-lts-18.04, linux-gcp-4.15, linux-image-generic-hwe-16.04, linux-image-virtual-hwe-16.04-edge, linux-raspi2, linux-image-generic-lpae-hwe-16.04-edge, linux-image-snapdragon, linux-image-4.15.0-1072-oracle, linux-image-4.15.0-144-lowlatency, linux-image-generic-lpae-hwe-16.04, linux-image-4.15.0-1086-raspi2, linux-azure-4.15, linux-image-4.15.0-1103-aws, linux-hwe, linux-image-oracle-lts-18.04, linux-image-4.15.0-144-generic, linux-image-generic-hwe-16.04-edge, linux-kvm, linux-image-4.15.0-1103-snapdragon, linux-snapdragon, linux-aws-hwe, linux-image-4.15.0-1115-azure, linux-azure, linux-image-generic-lpae, linux-gcp, linux-image-gcp-lts-18.04, linux-image-oem, linux-image-oracle, linux-image-gcp, linux-oracle, linux-image-aws-hwe, linux-image-azure, linux-aws, linux-image-azure-lts-18.04, linux, linux-image-virtual, linux-image-lowlatency-hwe-16.04-edge, linux-image-raspi2, linux-image-4.15.0-1100-gcp, linux-image-lowlatency, linux-image-kvm, linux-image-4.15.0-1092-kvm, linux-image-4.15.0-144-generic-lpae, linux-image-azure-edge, linux-image-virtual-hwe-16.04, linux-image-lowlatency-hwe-16.04, linux-image-generic, linux-image-gke