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USN-4708-1: Linux kernel vulnerabilities

28 January 2021

Several security issues were fixed in the Linux kernel.

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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.

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Releases

Packages

Details

Wen Xu discovered that the XFS filesystem implementation in the Linux
kernel did not properly track inode validations. An attacker could use this
to construct a malicious XFS image that, when mounted, could cause a denial
of service (system crash). (CVE-2018-13093)

It was discovered that the btrfs file system implementation in the Linux
kernel did not properly validate file system metadata in some situations.
An attacker could use this to construct a malicious btrfs image that, when
mounted, could cause a denial of service (system crash). (CVE-2019-19813,
CVE-2019-19816)

Bodong Zhao discovered a use-after-free in the Sun keyboard driver
implementation in the Linux kernel. A local attacker could use this to
cause a denial of service or possibly execute arbitrary code.
(CVE-2020-25669)

Daniel Axtens discovered that PowerPC RTAS implementation in the Linux
kernel did not properly restrict memory accesses in some situations. A
privileged local attacker could use this to arbitrarily modify kernel
memory, potentially bypassing kernel lockdown restrictions.
(CVE-2020-27777)

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.

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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.

References

Related notices

  • USN-4679-1: linux-image-kvm, linux-image-snapdragon-hwe-18.04, linux-image-5.4.0-1035-azure, linux, linux-image-generic-lpae-hwe-20.04, linux-gke-5.4, linux-image-lowlatency-hwe-18.04-edge, linux-oracle-5.4, linux-image-5.4.0-1034-aws, linux-azure-5.4, linux-image-generic-hwe-20.04, linux-image-virtual-hwe-20.04, linux-image-lowlatency-hwe-18.04, linux-image-oracle-edge, linux-image-gcp-edge, linux-image-5.4.0-1033-gke, linux-image-generic-hwe-18.04, linux-image-raspi, linux-hwe-5.4, linux-gcp-5.4, linux-image-5.4.0-1026-raspi, linux-raspi, linux-image-raspi2-hwe-18.04, linux-image-5.4.0-59-lowlatency, linux-image-azure-edge, linux-image-virtual-hwe-18.04-edge, linux-azure, linux-image-generic-hwe-18.04-edge, linux-image-lowlatency, linux-image-virtual-hwe-18.04, linux-image-generic-lpae, linux-image-generic-lpae-hwe-18.04-edge, linux-image-5.4.0-59-generic, linux-aws-5.4, linux-image-oem-osp1, linux-image-5.4.0-1033-gcp, linux-image-azure, linux-raspi-5.4, linux-image-5.4.0-1034-oracle, linux-image-aws-edge, linux-gcp, linux-image-snapdragon-hwe-18.04-edge, linux-image-generic, linux-image-raspi-hwe-18.04-edge, linux-image-oem, linux-image-raspi2, linux-image-oracle, linux-image-gcp, linux-image-raspi-hwe-18.04, linux-image-5.4.0-59-generic-lpae, linux-image-raspi2-hwe-18.04-edge, linux-image-generic-lpae-hwe-18.04, linux-image-gke-5.4, linux-image-virtual, linux-image-aws, linux-kvm, linux-image-lowlatency-hwe-20.04, linux-aws, linux-image-5.4.0-1031-kvm, linux-oracle
  • USN-4680-1: linux-image-kvm, linux-image-generic-lpae-hwe-16.04, linux-image-gke, linux, linux-image-virtual-hwe-16.04, linux-image-4.15.0-1091-gcp, linux-image-generic-hwe-16.04, linux-aws-hwe, linux-image-lowlatency-hwe-16.04, linux-raspi2, linux-image-4.15.0-1103-azure, linux-image-4.15.0-129-generic-lpae, linux-image-gcp-lts-18.04, linux-image-azure-edge, linux-gke-4.15, linux-image-azure-lts-18.04, linux-snapdragon, linux-azure, linux-image-lowlatency, linux-image-snapdragon, linux-image-generic-lpae, linux-image-4.15.0-1077-gke, linux-image-generic-hwe-16.04-edge, linux-image-azure, linux-image-oracle-lts-18.04, linux-gcp-4.15, linux-gcp, linux-image-4.15.0-1082-kvm, linux-image-gke-4.15, linux-image-generic, linux-image-4.15.0-1094-snapdragon, linux-azure-4.15, linux-image-oem, linux-image-raspi2, linux-image-oracle, linux-image-gcp, linux-image-lowlatency-hwe-16.04-edge, linux-image-aws-lts-18.04, linux-image-virtual, linux-image-virtual-hwe-16.04-edge, linux-image-4.15.0-1062-oracle, linux-image-4.15.0-1091-aws, linux-image-4.15.0-129-generic, linux-image-generic-lpae-hwe-16.04-edge, linux-hwe, linux-kvm, linux-aws, linux-image-4.15.0-129-lowlatency, linux-image-4.15.0-1077-raspi2, linux-image-aws-hwe, linux-oracle
  • USN-4751-1: linux-hwe-5.8, linux-image-kvm, linux-image-5.8.0-1023-gcp, linux-image-5.8.0-44-generic-64k, linux-image-gke, linux, linux-image-generic-lpae-hwe-20.04, linux-image-generic-hwe-20.04, linux-image-generic-lpae-hwe-20.04-edge, linux-image-virtual-hwe-20.04, linux-image-oem-20.04, linux-image-generic-hwe-20.04-edge, linux-image-raspi, linux-raspi, linux-image-5.8.0-1016-raspi-nolpae, linux-azure, linux-image-lowlatency, linux-image-generic-lpae, linux-image-5.8.0-44-generic-lpae, linux-image-raspi-nolpae, linux-image-azure, linux-image-virtual-hwe-20.04-edge, linux-image-5.8.0-44-generic, linux-image-generic-64k-hwe-20.04-edge, linux-image-lowlatency-hwe-20.04-edge, linux-gcp, linux-image-generic, linux-image-5.8.0-44-lowlatency, linux-image-generic-64k-hwe-20.04, linux-image-5.8.0-1019-kvm, linux-image-gcp, linux-image-oracle, linux-image-virtual, linux-image-5.8.0-1021-oracle, linux-image-aws, linux-kvm, linux-image-lowlatency-hwe-20.04, linux-aws, linux-image-5.8.0-1024-aws, linux-image-5.8.0-1023-azure, linux-image-5.8.0-1016-raspi, linux-oracle, linux-image-generic-64k
  • USN-4118-1: linux-image-4.15.0-1047-aws, linux-image-aws, linux-aws, linux-image-aws-hwe, linux-aws-hwe
  • USN-4094-1: linux-image-kvm, linux-image-generic-lpae-hwe-16.04, linux, linux-image-virtual-hwe-16.04, linux-image-4.15.0-58-generic, linux-image-generic-hwe-16.04, linux-image-lowlatency-hwe-16.04, linux-raspi2, linux-image-4.15.0-1040-gcp, linux-image-4.15.0-58-lowlatency, linux-image-4.15.0-1060-snapdragon, linux-image-4.15.0-1021-oracle, linux-image-4.15.0-1050-oem, linux-gke-4.15, linux-snapdragon, linux-azure, linux-image-lowlatency, linux-image-snapdragon, linux-image-generic-lpae, linux-image-generic-hwe-16.04-edge, linux-image-4.15.0-1042-kvm, linux-gcp, linux-image-4.15.0-1040-gke, linux-image-gke-4.15, linux-image-generic, linux-image-oem, linux-image-raspi2, linux-image-oracle, linux-image-gcp, linux-image-lowlatency-hwe-16.04-edge, linux-image-4.15.0-1043-raspi2, linux-image-virtual, linux-image-virtual-hwe-16.04-edge, linux-image-generic-lpae-hwe-16.04-edge, linux-hwe, linux-kvm, linux-image-4.15.0-58-generic-lpae, linux-oem, linux-image-gke, linux-oracle
  • USN-4709-1: linux-image-kvm, linux-image-4.4.0-1149-snapdragon, linux-image-4.4.0-1087-kvm, linux-image-4.4.0-1085-aws, linux-image-4.4.0-1145-raspi2, linux-image-aws, linux-kvm, linux-snapdragon, linux-aws, linux-image-snapdragon, linux-image-4.4.0-1121-aws, linux-image-raspi2, linux-raspi2
  • USN-4414-1: linux-image-kvm, linux-image-generic-lpae-hwe-16.04, linux-image-4.15.0-107-generic, linux, linux-image-4.15.0-109-lowlatency, linux-image-4.15.0-1064-gke, linux-image-virtual-hwe-16.04, linux-image-generic-hwe-16.04, linux-aws-hwe, linux-image-lowlatency-hwe-16.04, linux-raspi2, linux-image-gcp-lts-18.04, linux-image-4.15.0-1081-snapdragon, linux-gke-4.15, linux-image-azure-edge, linux-image-azure-lts-18.04, linux-azure, linux-image-4.15.0-107-generic-lpae, linux-image-lowlatency, linux-snapdragon, linux-image-snapdragon, linux-image-generic-lpae, linux-image-4.15.0-1091-azure, linux-image-generic-hwe-16.04-edge, linux-image-4.15.0-1078-gcp, linux-image-azure, linux-image-oracle-lts-18.04, linux-gcp-4.15, linux-image-4.15.0-1074-aws, linux-image-4.15.0-1077-aws, linux-image-4.15.0-1046-oracle, linux-gcp, linux-image-4.15.0-109-generic, linux-image-gke-4.15, linux-image-generic, linux-azure-4.15, linux-image-oem, linux-image-4.15.0-107-lowlatency, linux-image-raspi2, linux-image-oracle, linux-image-gcp, linux-image-lowlatency-hwe-16.04-edge, linux-image-aws-lts-18.04, linux-image-virtual, linux-image-virtual-hwe-16.04-edge, linux-image-4.15.0-1065-raspi2, linux-image-generic-lpae-hwe-16.04-edge, linux-hwe, linux-image-4.15.0-1091-oem, linux-kvm, linux-aws, linux-image-4.15.0-1048-oracle, linux-image-aws-hwe, linux-image-gke, linux-image-4.15.0-1069-kvm, linux-oem, linux-oracle, linux-image-4.15.0-109-generic-lpae
  • USN-4749-1: linux-image-kvm, linux-image-generic-lpae-hwe-16.04, linux-image-4.15.0-1079-gke, linux, linux-image-4.15.0-1094-aws, linux-image-virtual-hwe-16.04, linux-image-4.15.0-136-generic, linux-image-generic-hwe-16.04, linux-aws-hwe, linux-image-lowlatency-hwe-16.04, linux-raspi2, linux-image-gcp-lts-18.04, linux-image-azure-edge, linux-gke-4.15, linux-image-azure-lts-18.04, linux-snapdragon, linux-azure, linux-image-lowlatency, linux-image-dell300x, linux-image-snapdragon, linux-image-generic-lpae, linux-dell300x, linux-image-4.15.0-1093-gcp, linux-image-4.15.0-1079-raspi2, linux-image-generic-hwe-16.04-edge, linux-image-azure, linux-image-4.15.0-1096-snapdragon, linux-image-oracle-lts-18.04, linux-image-4.15.0-1012-dell300x, linux-gcp-4.15, linux-gcp, linux-image-gke-4.15, linux-image-generic, linux-image-4.15.0-1108-azure, linux-image-4.15.0-1065-oracle, linux-azure-4.15, linux-image-oem, linux-image-raspi2, linux-image-oracle, linux-image-gcp, linux-image-lowlatency-hwe-16.04-edge, linux-image-aws-lts-18.04, linux-image-virtual, linux-image-virtual-hwe-16.04-edge, linux-image-4.15.0-1085-kvm, linux-image-generic-lpae-hwe-16.04-edge, linux-image-4.15.0-136-generic-lpae, linux-hwe, linux-kvm, linux-image-4.15.0-136-lowlatency, linux-aws, linux-image-aws-hwe, linux-image-gke, linux-oracle
  • USN-4750-1: linux-image-kvm, linux-image-snapdragon-hwe-18.04, linux, linux-gke-5.4, linux-image-lowlatency-hwe-18.04-edge, linux-oracle-5.4, linux-azure-5.4, linux-image-lowlatency-hwe-18.04, linux-image-oracle-edge, linux-image-5.4.0-1010-gkeop, linux-image-gcp-edge, linux-image-generic-hwe-18.04, linux-image-raspi, linux-oracle, linux-hwe-5.4, linux-gcp-5.4, linux-raspi, linux-gkeop-5.4, linux-image-raspi2-hwe-18.04, linux-image-azure-edge, linux-image-virtual-hwe-18.04-edge, linux-gkeop, linux-azure, linux-image-generic-hwe-18.04-edge, linux-image-lowlatency, linux-image-virtual-hwe-18.04, linux-image-generic-lpae, linux-image-generic-lpae-hwe-18.04-edge, linux-image-5.4.0-1037-gcp, linux-image-5.4.0-1036-gke, linux-image-5.4.0-1033-kvm, linux-aws-5.4, linux-image-oem-osp1, linux-image-azure, linux-raspi-5.4, linux-image-gkeop, linux-image-5.4.0-66-generic, linux-image-aws-edge, linux-gcp, linux-image-snapdragon-hwe-18.04-edge, linux-image-generic, linux-image-raspi-hwe-18.04-edge, linux-image-oem, linux-image-raspi2, linux-image-5.4.0-1038-aws, linux-image-oracle, linux-image-gcp, linux-image-raspi-hwe-18.04, linux-image-raspi2-hwe-18.04-edge, linux-image-gkeop-5.4, linux-image-generic-lpae-hwe-18.04, linux-image-gke-5.4, linux-image-virtual, linux-image-aws, linux-image-5.4.0-66-generic-lpae, linux-kvm, linux-aws, linux-image-5.4.0-1029-raspi, linux-image-5.4.0-66-lowlatency, linux-image-5.4.0-1040-azure, linux-image-5.4.0-1038-oracle
  • USN-4912-1: linux-image-5.6.0-1053-oem, linux-image-oem-20.04, linux-oem-5.6

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