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USN-4427-1: Linux kernel vulnerabilities

27 July 2020

Several security issues were fixed in the Linux kernel.

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Releases

Packages

Details

It was discovered that the Kvaser CAN/USB driver in the Linux kernel did
not properly initialize memory in certain situations. A local attacker
could possibly use this to expose sensitive information (kernel memory).
(CVE-2019-19947)

Chuhong Yuan discovered that go7007 USB audio device driver in the Linux
kernel did not properly deallocate memory in some failure conditions. A
physically proximate attacker could use this to cause a denial of service
(memory exhaustion). (CVE-2019-20810)

Jason A. Donenfeld discovered that the ACPI implementation in the Linux
kernel did not properly restrict loading SSDT code from an EFI variable. A
privileged attacker could use this to bypass Secure Boot lockdown
restrictions and execute arbitrary code in the kernel. (CVE-2019-20908)

It was discovered that the elf handling code in the Linux kernel did not
initialize memory before using it in certain situations. A local attacker
could use this to possibly expose sensitive information (kernel memory).
(CVE-2020-10732)

It was discovered that the Linux kernel did not correctly apply Speculative
Store Bypass Disable (SSBD) mitigations in certain situations. A local
attacker could possibly use this to expose sensitive information.
(CVE-2020-10766)

It was discovered that the Linux kernel did not correctly apply Indirect
Branch Predictor Barrier (IBPB) mitigations in certain situations. A local
attacker could possibly use this to expose sensitive information.
(CVE-2020-10767)

It was discovered that the Linux kernel could incorrectly enable Indirect
Branch Speculation after it has been disabled for a process via a prctl()
call. A local attacker could possibly use this to expose sensitive
information. (CVE-2020-10768)

Mauricio Faria de Oliveira discovered that the aufs implementation in the
Linux kernel improperly managed inode reference counts in the
vfsub_dentry_open() method. A local attacker could use this vulnerability
to cause a denial of service. (CVE-2020-11935)

It was discovered that the Virtual Terminal keyboard driver in the Linux
kernel contained an integer overflow. A local attacker could possibly use
this to have an unspecified impact. (CVE-2020-13974)

It was discovered that the efi subsystem in the Linux kernel did not handle
memory allocation failures during early boot in some situations. A local
attacker could possibly use this to cause a denial of service (system
crash). (CVE-2019-12380)

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-4439-1: linux-image-5.0.0-1065-oem-osp1, linux-gke-5.0, linux-image-gke-5.0, linux-image-5.0.0-1045-gke, linux-image-oem-osp1, linux-oem-osp1
  • USN-4440-1: linux-image-gkeop-5.3, linux-image-oracle, linux-image-raspi2-hwe-18.04, linux-gcp-5.3, linux-azure-5.3, linux-oracle-5.3, linux-image-5.3.0-1032-gcp, linux-image-5.3.0-1030-oracle, linux-image-5.3.0-1030-raspi2, linux-image-5.3.0-1032-aws, linux-image-gke-5.3, linux-image-5.3.0-1032-gke, linux-image-azure, linux-raspi2-5.3, linux-gke-5.3, linux-image-5.3.0-64-lowlatency, linux-image-gcp, linux-image-5.3.0-64-generic, linux-hwe, linux-image-5.3.0-64-generic-lpae, linux-aws-5.3, linux-image-5.3.0-1034-azure, linux-image-aws
  • USN-4483-1: linux-image-oracle, linux-image-5.4.0-45-lowlatency, linux-raspi-5.4, linux-image-lowlatency-hwe-18.04, linux-image-raspi2-hwe-18.04, linux-image-virtual-hwe-18.04, linux-image-5.4.0-1023-azure, linux-hwe-5.4, linux-image-5.4.0-1022-oracle, linux-gcp, linux-azure, linux-image-generic-hwe-18.04, linux-image-generic, linux-image-lowlatency-hwe-20.04, linux-kvm, linux-image-raspi-hwe-18.04, linux-image-raspi2-hwe-18.04-edge, linux-image-raspi-hwe-18.04-edge, linux-gcp-5.4, linux-image-generic-lpae-hwe-20.04, linux-image-snapdragon-hwe-18.04, linux-image-azure, linux-image-oem-osp1, linux, linux-image-generic-hwe-18.04-edge, linux-image-gke-5.4, linux-oracle-5.4, linux-image-oem, linux-image-virtual-hwe-20.04, linux-raspi, linux-azure-5.4, linux-aws-5.4, linux-image-gcp, linux-image-gke, linux-image-raspi2, linux-oracle, linux-image-lowlatency, linux-image-5.4.0-45-generic-lpae, linux-image-generic-hwe-20.04, linux-image-generic-lpae-hwe-18.04-edge, linux-image-5.4.0-1016-raspi, linux-image-snapdragon-hwe-18.04-edge, linux-image-raspi, linux-image-generic-lpae-hwe-18.04, linux-image-5.4.0-1022-gcp, linux-image-gcp-edge, linux-image-generic-lpae, linux-image-aws-edge, linux-image-kvm, linux-image-virtual, linux-image-5.4.0-1022-aws, linux-image-5.4.0-45-generic, linux-image-virtual-hwe-18.04-edge, linux-image-lowlatency-hwe-18.04-edge, linux-image-azure-edge, linux-image-oracle-edge, linux-aws, linux-image-gkeop-5.4, linux-image-aws
  • USN-4485-1: linux-image-gcp-lts-18.04, linux-image-oracle, linux-snapdragon, linux-gke-4.15, linux-oem, linux-azure, linux-image-4.15.0-1094-oem, linux-image-4.15.0-115-lowlatency, linux-image-generic-lpae-hwe-16.04, linux-image-generic-lpae-hwe-16.04-edge, linux-image-gke-4.15, linux-image-4.15.0-1093-azure, linux-image-aws-hwe, linux-image-4.15.0-1080-aws, linux-image-generic, linux-image-4.15.0-1072-kvm, linux-image-azure-lts-18.04, linux-image-generic-hwe-16.04-edge, linux-kvm, linux-image-generic-hwe-16.04, linux-aws-hwe, linux-image-aws-lts-18.04, linux-image-4.15.0-115-generic-lpae, linux-image-azure, linux-image-4.15.0-1081-gcp, linux, linux-image-oem, linux-image-snapdragon, linux-image-gke, linux-image-gcp, linux-image-raspi2, linux-oracle, linux-image-4.15.0-1068-raspi2, linux-image-lowlatency, linux-hwe, linux-image-4.15.0-1051-oracle, linux-image-lowlatency-hwe-16.04-edge, linux-raspi2, linux-image-virtual-hwe-16.04, linux-image-4.15.0-1084-snapdragon, linux-azure-4.15, linux-image-generic-lpae, linux-image-oracle-lts-18.04, linux-image-lowlatency-hwe-16.04, linux-image-kvm, linux-image-virtual, linux-image-virtual-hwe-16.04-edge, linux-image-azure-edge, linux-gcp-4.15, linux-aws, linux-image-4.15.0-115-generic, linux-image-4.15.0-1067-gke, linux-gcp
  • USN-4414-1: linux-image-gcp-lts-18.04, linux-image-oracle, linux-snapdragon, linux-gke-4.15, linux-oem, linux-azure, linux-image-gke-4.15, linux-image-generic-lpae-hwe-16.04, linux-image-generic-lpae-hwe-16.04-edge, linux-image-4.15.0-1065-raspi2, linux-image-aws-hwe, linux-image-generic, linux-image-4.15.0-1074-aws, linux-image-azure-lts-18.04, linux-image-generic-hwe-16.04-edge, linux-kvm, linux-image-4.15.0-1091-oem, linux-image-4.15.0-1048-oracle, linux-image-generic-hwe-16.04, linux-aws-hwe, linux-image-aws-lts-18.04, linux-image-azure, linux-image-4.15.0-1078-gcp, linux, linux-image-oem, linux-image-snapdragon, linux-image-gke, linux-image-gcp, linux-image-raspi2, linux-oracle, linux-image-lowlatency, linux-image-4.15.0-107-generic-lpae, linux-hwe, linux-image-4.15.0-1081-snapdragon, linux-image-lowlatency-hwe-16.04-edge, linux-image-4.15.0-1077-aws, linux-raspi2, linux-image-virtual-hwe-16.04, linux-image-4.15.0-109-lowlatency, linux-image-4.15.0-107-lowlatency, linux-image-4.15.0-107-generic, linux-azure-4.15, linux-image-generic-lpae, linux-image-4.15.0-1091-azure, linux-image-oracle-lts-18.04, linux-image-lowlatency-hwe-16.04, linux-image-4.15.0-1069-kvm, linux-image-4.15.0-109-generic-lpae, linux-image-kvm, linux-image-virtual, linux-image-4.15.0-109-generic, linux-image-virtual-hwe-16.04-edge, linux-image-4.15.0-1064-gke, linux-image-azure-edge, linux-gcp-4.15, linux-aws, linux-image-4.15.0-1046-oracle, linux-gcp
  • USN-4284-1: linux-image-oracle, linux-image-5.3.0-40-snapdragon, linux-image-lowlatency-hwe-18.04, linux-image-raspi2-hwe-18.04, linux-image-virtual-hwe-18.04, linux-gcp-5.3, linux-image-5.3.0-40-lowlatency, linux-gcp, linux-azure, linux-image-generic-hwe-18.04, linux-azure-5.3, linux-image-generic, linux-image-5.3.0-1012-gcp, linux-kvm, linux-image-snapdragon-hwe-18.04, linux-image-azure, linux, linux-image-generic-hwe-18.04-edge, linux-image-5.3.0-40-generic-lpae, linux-image-5.3.0-40-generic, linux-raspi2-5.3, linux-image-snapdragon, linux-image-gke, linux-image-gcp, linux-image-raspi2, linux-image-5.3.0-1013-azure, linux-oracle, linux-image-lowlatency, linux-hwe, linux-image-5.3.0-1010-kvm, linux-image-generic-lpae-hwe-18.04-edge, linux-image-snapdragon-hwe-18.04-edge, linux-image-5.3.0-1011-aws, linux-raspi2, linux-image-generic-lpae-hwe-18.04, linux-image-5.3.0-1009-oracle, linux-image-gcp-edge, linux-image-generic-lpae, linux-image-5.3.0-1018-raspi2, linux-image-kvm, linux-image-virtual, linux-image-virtual-hwe-18.04-edge, linux-image-lowlatency-hwe-18.04-edge, linux-image-azure-edge, linux-aws, linux-image-aws
  • USN-4285-1: linux-image-5.0.0-1031-gcp, linux-gke-5.0, linux-image-gke-5.0, linux-aws-5.0, linux-image-gcp, linux-image-5.0.0-1032-azure, linux-image-aws-edge, linux-oracle-5.0, linux-image-5.0.0-1011-oracle, linux-azure, linux-image-azure, linux-image-oracle-edge, linux-image-5.0.0-1030-gke, linux-image-5.0.0-1025-aws, linux-gcp
  • USN-4426-1: linux-image-gcp-lts-18.04, linux-image-oracle, linux-snapdragon, linux-gke-4.15, linux-oem, linux-azure, linux-image-4.15.0-1080-gcp, linux-image-generic-lpae-hwe-16.04, linux-image-generic-lpae-hwe-16.04-edge, linux-image-gke-4.15, linux-image-4.15.0-1071-kvm, linux-image-aws-hwe, linux-image-4.15.0-1079-aws, linux-image-4.15.0-1092-azure, linux-image-generic, linux-image-azure-lts-18.04, linux-image-generic-hwe-16.04-edge, linux-image-4.15.0-112-generic-lpae, linux-kvm, linux-image-generic-hwe-16.04, linux-aws-hwe, linux-image-4.15.0-1093-oem, linux-image-aws-lts-18.04, linux-image-azure, linux, linux-image-oem, linux-image-4.15.0-1050-oracle, linux-image-gke, linux-image-4.15.0-1066-gke, linux-image-gcp, linux-image-raspi2, linux-oracle, linux-image-lowlatency, linux-hwe, linux-image-lowlatency-hwe-16.04-edge, linux-raspi2, linux-image-4.15.0-112-lowlatency, linux-image-virtual-hwe-16.04, linux-image-4.15.0-1067-raspi2, linux-azure-4.15, linux-image-generic-lpae, linux-image-oracle-lts-18.04, linux-image-lowlatency-hwe-16.04, linux-image-kvm, linux-image-virtual, linux-image-virtual-hwe-16.04-edge, linux-image-azure-edge, linux-image-4.15.0-112-generic, linux-aws, linux-gcp-4.15, linux-gcp
  • USN-4411-1: linux-image-oracle, linux-image-lowlatency-hwe-18.04, linux-image-virtual-hwe-18.04, linux-gcp, linux-image-generic-hwe-18.04, linux-azure, linux-image-5.4.0-1013-raspi, linux-image-generic, linux-image-lowlatency-hwe-20.04, linux-image-5.4.0-1019-gcp, linux-image-5.4.0-40-generic, linux-kvm, linux-image-5.4.0-40-generic-lpae, linux-image-5.4.0-1020-azure, linux-image-generic-lpae-hwe-20.04, linux-image-azure, linux-image-oem-osp1, linux, linux-image-generic-hwe-18.04-edge, linux-image-5.4.0-40-lowlatency, linux-image-oem, linux-image-virtual-hwe-20.04, linux-raspi, linux-image-gke, linux-image-gcp, linux-image-raspi2, linux-oracle, linux-image-lowlatency, linux-image-generic-hwe-20.04, linux-image-generic-lpae-hwe-18.04-edge, linux-image-5.4.0-1019-oracle, linux-image-5.4.0-28-generic, linux-image-5.4.0-1018-aws, linux-image-raspi, linux-image-generic-lpae-hwe-18.04, linux-image-generic-lpae, linux-riscv, linux-image-kvm, linux-image-virtual, linux-image-virtual-hwe-18.04-edge, linux-image-lowlatency-hwe-18.04-edge, linux-aws, linux-image-aws
  • USN-4425-1: linux-image-oracle, linux-image-5.4.0-30-generic, linux-raspi-5.4, linux-image-lowlatency-hwe-18.04, linux-image-raspi2-hwe-18.04, linux-image-virtual-hwe-18.04, linux-image-5.4.0-1020-aws, linux-hwe-5.4, linux-gcp, linux-image-generic-hwe-18.04, linux-azure, linux-image-5.4.0-1021-oracle, linux-image-generic, linux-image-lowlatency-hwe-20.04, linux-kvm, linux-image-raspi-hwe-18.04, linux-image-5.4.0-42-generic-lpae, linux-image-raspi2-hwe-18.04-edge, linux-image-raspi-hwe-18.04-edge, linux-image-generic-lpae-hwe-20.04, linux-image-5.4.0-42-generic, linux-image-snapdragon-hwe-18.04, linux-image-azure, linux-image-oem-osp1, linux-image-5.4.0-1015-raspi, linux, linux-image-generic-hwe-18.04-edge, linux-image-oem, linux-image-virtual-hwe-20.04, linux-raspi, linux-azure-5.4, linux-image-gke, linux-image-gcp, linux-image-raspi2, linux-oracle, linux-image-lowlatency, linux-image-5.4.0-1022-azure, linux-image-generic-hwe-20.04, linux-image-generic-lpae-hwe-18.04-edge, linux-image-5.4.0-1021-gcp, linux-image-snapdragon-hwe-18.04-edge, linux-image-raspi, linux-image-generic-lpae-hwe-18.04, linux-image-generic-lpae, linux-riscv, linux-image-kvm, linux-image-virtual, linux-image-virtual-hwe-18.04-edge, linux-image-lowlatency-hwe-18.04-edge, linux-image-azure-edge, linux-image-5.4.0-42-lowlatency, linux-aws, linux-image-gkeop-5.4, linux-image-aws
  • LSN-0070-1: generic-5.4, aws, generic-4.15, generic-4.4, azure, lowlatency-4.4, lowlatency-5.4, lowlatency-4.15, oem, gcp
  • LSN-0072-1: generic-5.4, aws, generic-4.15, generic-4.4, azure, lowlatency-4.4, lowlatency-5.4, lowlatency-4.15, oem, gcp