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USN-4318-1: Linux kernel vulnerabilities

6 April 2020

Several security issues were fixed in the Linux kernel.

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

Releases

Packages

  • linux - Linux kernel
  • linux-hwe - Linux hardware enablement (HWE) kernel

Details

Al Viro discovered that the vfs layer in the Linux kernel contained a use-
after-free vulnerability. A local attacker could use this to cause a denial
of service (system crash) or possibly expose sensitive information (kernel
memory). (CVE-2020-8428)

Gustavo Romero and Paul Mackerras discovered that the KVM implementation in
the Linux kernel for PowerPC processors did not properly keep guest state
separate from host state. A local attacker in a KVM guest could use this to
cause a denial of service (host system crash). (CVE-2020-8834)

Shijie Luo discovered that the ext4 file system implementation in the Linux
kernel did not properly check for a too-large journal size. An attacker
could use this to construct a malicious ext4 image that, when mounted,
could cause a denial of service (soft lockup). (CVE-2020-8992)

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 18.04
Ubuntu 16.04

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-4320-1: linux-image-powerpc-e500mc-lts-wily, linux-image-lowlatency-lts-xenial, linux-image-powerpc-e500mc-lts-utopic, linux-image-4.4.0-177-powerpc64-emb, linux-image-4.4.0-1131-raspi2, linux-image-generic-lts-wily, linux-image-raspi2, linux-image-4.4.0-177-generic-lpae, linux-image-virtual, linux-image-powerpc64-smp, linux-image-virtual-lts-utopic, linux-image-powerpc64-smp-lts-xenial, linux-image-4.4.0-1065-aws, linux-image-powerpc64-smp-lts-utopic, linux-image-powerpc-e500mc-lts-xenial, linux-image-generic-lpae-lts-wily, linux-image-lowlatency-lts-vivid, linux-image-lowlatency-lts-utopic, linux-image-4.4.0-177-powerpc-e500mc, linux-image-powerpc-smp, linux-image-lowlatency-lts-wily, linux-image-powerpc64-emb-lts-vivid, linux-image-powerpc64-smp-lts-vivid, linux-image-virtual-lts-vivid, linux-image-4.4.0-177-powerpc64-smp, linux-image-generic-lpae, linux-image-generic, linux-image-generic-lts-vivid, linux-image-generic-lts-xenial, linux-image-generic-lpae-lts-xenial, linux-image-powerpc-smp-lts-wily, linux-image-virtual-lts-wily, linux-image-4.4.0-177-lowlatency, linux-image-generic-lpae-lts-utopic, linux-image-powerpc-e500mc, linux-image-powerpc-e500mc-lts-vivid, linux-image-generic-lpae-lts-vivid, linux-image-virtual-lts-xenial, linux-image-aws, linux-image-4.4.0-1135-snapdragon, linux-image-powerpc64-emb, linux-image-generic-lts-utopic, linux-image-lowlatency, linux-image-powerpc64-emb-lts-wily, linux-snapdragon, linux-image-4.4.0-177-generic, linux-aws, linux-lts-xenial, linux-image-powerpc64-emb-lts-xenial, linux-raspi2, linux-image-4.4.0-177-powerpc-smp, linux-image-powerpc-smp-lts-xenial, linux-image-snapdragon, linux-kvm, linux-image-powerpc-smp-lts-utopic, linux-image-4.4.0-1069-kvm, linux-image-powerpc64-emb-lts-utopic, linux-image-powerpc-smp-lts-vivid, linux-image-4.4.0-1105-aws, linux, linux-image-powerpc64-smp-lts-wily, linux-image-kvm
  • USN-4319-1: linux-hwe, linux-image-5.3.0-1014-oracle, linux-image-kvm, linux-image-5.3.0-46-snapdragon, linux-image-5.3.0-46-generic-lpae, linux-image-azure-edge, linux-image-raspi2, linux-image-5.3.0-1017-gcp, linux-image-virtual, linux-oracle-5.3, linux-image-5.3.0-1022-raspi2, linux-image-generic-hwe-18.04, linux-image-oracle-edge, linux-image-generic-hwe-18.04-edge, linux-image-oracle, linux-image-generic-lpae, linux-image-generic, linux-image-generic-lpae-hwe-18.04, linux-oracle, linux-image-lowlatency-hwe-18.04, linux-azure-5.3, linux-image-5.3.0-1016-aws, linux-image-snapdragon-hwe-18.04, linux-image-virtual-hwe-18.04-edge, linux-image-5.3.0-46-generic, linux-image-aws, linux-image-generic-lpae-hwe-18.04-edge, linux-image-lowlatency, linux-image-5.3.0-1019-azure, linux-aws, linux-image-raspi2-hwe-18.04, linux-raspi2, linux-image-snapdragon-hwe-18.04-edge, linux-raspi2-5.3, linux-image-snapdragon, linux-image-virtual-hwe-18.04, linux-kvm, linux-image-5.3.0-46-lowlatency, linux-image-lowlatency-hwe-18.04-edge, linux-image-5.3.0-1015-kvm, linux-image-gcp, linux-image-gcp-edge, linux-azure, linux-image-azure, linux, linux-image-gke, linux-gcp-5.3, linux-gcp
  • USN-4324-1: linux-image-oem, linux-image-4.15.0-1057-gke, linux-image-kvm, linux-image-4.15.0-1076-snapdragon, linux-image-aws-hwe, linux-image-azure-edge, linux-image-raspi2, linux-image-4.15.0-1077-azure, linux-image-oracle, linux-image-4.15.0-1060-raspi2, linux-oem, linux-image-oracle-lts-18.04, linux-oracle, linux-aws-hwe, linux-image-4.15.0-1037-oracle, linux-image-aws, linux-image-4.15.0-1079-oem, linux-image-4.15.0-1058-kvm, linux-image-4.15.0-1060-gcp, linux-snapdragon, linux-aws, linux-gke-4.15, linux-raspi2, linux-image-snapdragon, linux-kvm, linux-image-gke-4.15, linux-image-4.15.0-1065-aws, linux-image-aws-lts-18.04, linux-image-gcp, linux-azure, linux-image-azure, linux-image-gke, linux-gcp
  • USN-4325-1: linux-image-gke-5.0, linux-image-5.0.0-1034-gcp, linux-image-5.0.0-1014-oracle, linux-oracle-5.0, linux-image-gcp, linux-image-oracle, linux-azure, linux-image-azure, linux-image-oem-osp1, linux-image-5.0.0-1033-gke, linux-image-5.0.0-1036-azure, linux-gke-5.0, linux-oem-osp1, linux-gcp, linux-image-5.0.0-1047-oem-osp1
  • LSN-0065-1: gcp, lowlatency-4.15, azure, generic-4.4, generic-4.15, aws, lowlatency-4.4
  • USN-4344-1: linux-image-5.0.0-1050-oem-osp1, linux-image-gke-5.0, linux-image-oem-osp1, linux-gke-5.0, linux-oem-osp1, linux-image-5.0.0-1035-gke
  • USN-4342-1: linux-hwe, linux-image-kvm, linux-image-5.3.0-1023-raspi2, linux-gke-5.3, linux-image-azure-edge, linux-image-raspi2, linux-image-virtual, linux-oracle-5.3, linux-image-generic-hwe-18.04, linux-image-oracle-edge, linux-image-5.3.0-1016-kvm, linux-image-generic-hwe-18.04-edge, linux-image-5.3.0-1020-azure, linux-image-5.3.0-51-lowlatency, linux-image-oracle, linux-image-5.3.0-1017-aws, linux-image-generic-lpae, linux-image-generic, linux-image-generic-lpae-hwe-18.04, linux-oracle, linux-image-lowlatency-hwe-18.04, linux-azure-5.3, linux-image-snapdragon-hwe-18.04, linux-image-virtual-hwe-18.04-edge, linux-image-aws, linux-image-generic-lpae-hwe-18.04-edge, linux-image-lowlatency, linux-image-5.3.0-1016-oracle, linux-image-5.3.0-51-snapdragon, linux-aws, linux-image-raspi2-hwe-18.04, linux-raspi2, linux-image-snapdragon-hwe-18.04-edge, linux-raspi2-5.3, linux-image-snapdragon, linux-image-virtual-hwe-18.04, linux-kvm, linux-image-gke-5.3, linux-image-lowlatency-hwe-18.04-edge, linux-image-5.3.0-51-generic-lpae, linux-image-gcp, linux-image-gcp-edge, linux-azure, linux-image-azure, linux, linux-image-5.3.0-1018-gke, linux-image-5.3.0-51-generic, linux-image-5.3.0-1018-gcp, linux-image-gke, linux-gcp-5.3, linux-gcp
  • USN-4419-1: linux-image-powerpc-e500mc-lts-wily, linux-image-lowlatency-lts-xenial, linux-image-powerpc-e500mc-lts-utopic, linux-image-generic-lts-wily, linux-image-raspi2, linux-image-virtual, linux-image-powerpc64-smp, linux-image-4.4.0-185-generic-lpae, linux-image-virtual-lts-utopic, linux-image-powerpc64-smp-lts-xenial, linux-image-powerpc64-smp-lts-utopic, linux-image-powerpc-e500mc-lts-xenial, linux-image-generic-lpae-lts-wily, linux-image-4.4.0-185-powerpc64-emb, linux-image-lowlatency-lts-vivid, linux-image-lowlatency-lts-utopic, linux-image-powerpc-smp, linux-image-powerpc64-emb-lts-vivid, linux-image-lowlatency-lts-wily, linux-image-powerpc64-smp-lts-vivid, linux-image-virtual-lts-vivid, linux-image-4.4.0-1139-snapdragon, linux-image-generic-lts-xenial, linux-image-generic-lpae, linux-image-generic, linux-image-generic-lts-vivid, linux-image-generic-lpae-lts-xenial, linux-image-powerpc-smp-lts-wily, linux-image-virtual-lts-wily, linux-image-generic-lpae-lts-utopic, linux-image-powerpc-e500mc, linux-image-powerpc-e500mc-lts-vivid, linux-image-generic-lpae-lts-vivid, linux-image-virtual-lts-xenial, linux-image-4.4.0-1135-raspi2, linux-image-4.4.0-1076-kvm, linux-image-aws, linux-image-powerpc64-emb, linux-image-generic-lts-utopic, linux-image-lowlatency, linux-image-powerpc64-emb-lts-wily, linux-snapdragon, linux-image-4.4.0-185-powerpc64-smp, linux-aws, linux-lts-xenial, linux-image-powerpc64-emb-lts-xenial, linux-raspi2, linux-image-4.4.0-1074-aws, linux-image-4.4.0-1110-aws, linux-image-powerpc-smp-lts-xenial, linux-image-snapdragon, linux-kvm, linux-image-powerpc-smp-lts-utopic, linux-image-4.4.0-185-powerpc-smp, linux-image-powerpc64-emb-lts-utopic, linux-image-powerpc-smp-lts-vivid, linux-image-4.4.0-185-powerpc-e500mc, linux, linux-image-powerpc64-smp-lts-wily, linux-image-4.4.0-185-lowlatency, linux-image-4.4.0-185-generic, linux-image-kvm