USN-4890-1: Linux kernel vulnerabilities

Releases

• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM
• Ubuntu 14.04 ESM

Packages

• linux - Linux kernel
• linux-aws - Linux kernel for Amazon Web Services (AWS) systems
• linux-aws-hwe - Linux kernel for Amazon Web Services (AWS-HWE) systems
• linux-azure - Linux kernel for Microsoft Azure Cloud systems
• linux-azure-4.15 - Linux kernel for Microsoft Azure Cloud systems
• linux-dell300x - Linux kernel for Dell 300x platforms
• linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
• linux-gcp-4.15 - Linux kernel for Google Cloud Platform (GCP) systems
• linux-hwe - Linux hardware enablement (HWE) kernel
• linux-kvm - Linux kernel for cloud environments
• linux-oracle - Linux kernel for Oracle Cloud systems
• linux-raspi2 - Linux kernel for Raspberry Pi (V8) systems
• linux-snapdragon - Linux kernel for Qualcomm Snapdragon processors

Details

Piotr Krysiuk discovered that the BPF subsystem in the Linux kernel did not
properly compute a speculative execution limit on pointer arithmetic in
some situations. A local attacker could use this to expose sensitive
information (kernel memory). (CVE-2020-27171)

Piotr Krysiuk discovered that the BPF subsystem in the Linux kernel did not
properly apply speculative execution limits on some pointer types. A local
attacker could use this to expose sensitive information (kernel memory).
(CVE-2020-27170)

Update instructions

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

Ubuntu 18.04

• linux-image-4.15.0-1015-dell300x - 4.15.0-1015.19
• linux-image-4.15.0-1068-oracle - 4.15.0-1068.76
• linux-image-4.15.0-1082-raspi2 - 4.15.0-1082.87
• linux-image-4.15.0-1088-kvm - 4.15.0-1088.90
• linux-image-4.15.0-1096-gcp - 4.15.0-1096.109
• linux-image-4.15.0-1097-aws - 4.15.0-1097.104
• linux-image-4.15.0-1099-snapdragon - 4.15.0-1099.108
• linux-image-4.15.0-1111-azure - 4.15.0-1111.123
• linux-image-4.15.0-140-generic - 4.15.0-140.144
• linux-image-4.15.0-140-generic-lpae - 4.15.0-140.144
• linux-image-4.15.0-140-lowlatency - 4.15.0-140.144
• linux-image-aws-lts-18.04 - 4.15.0.1097.100
• linux-image-azure-lts-18.04 - 4.15.0.1111.84
• linux-image-dell300x - 4.15.0.1015.17
• linux-image-gcp-lts-18.04 - 4.15.0.1096.114
• linux-image-generic - 4.15.0.140.127
• linux-image-generic-lpae - 4.15.0.140.127
• linux-image-kvm - 4.15.0.1088.84
• linux-image-lowlatency - 4.15.0.140.127
• linux-image-oracle-lts-18.04 - 4.15.0.1068.78
• linux-image-raspi2 - 4.15.0.1082.79
• linux-image-snapdragon - 4.15.0.1099.102
• linux-image-virtual - 4.15.0.140.127

Ubuntu 16.04

• linux-image-4.15.0-1068-oracle - 4.15.0-1068.76~16.04.1
• linux-image-4.15.0-1096-gcp - 4.15.0-1096.109~16.04.1
• linux-image-4.15.0-1097-aws - 4.15.0-1097.104~16.04.1
• linux-image-4.15.0-1111-azure - 4.15.0-1111.123~16.04.1
• linux-image-4.15.0-140-generic - 4.15.0-140.144~16.04.1
• linux-image-4.15.0-140-generic-lpae - 4.15.0-140.144~16.04.1
• linux-image-4.15.0-140-lowlatency - 4.15.0-140.144~16.04.1
• linux-image-aws-hwe - 4.15.0.1097.90
• linux-image-azure - 4.15.0.1111.102
• linux-image-gcp - 4.15.0.1096.97
• linux-image-generic-hwe-16.04 - 4.15.0.140.135
• linux-image-generic-lpae-hwe-16.04 - 4.15.0.140.135
• linux-image-gke - 4.15.0.1096.97
• linux-image-lowlatency-hwe-16.04 - 4.15.0.140.135
• linux-image-oem - 4.15.0.140.135
• linux-image-oracle - 4.15.0.1068.56
• linux-image-virtual-hwe-16.04 - 4.15.0.140.135

Ubuntu 14.04

• linux-image-4.15.0-1111-azure - 4.15.0-1111.123~14.04.1
• linux-image-azure - 4.15.0.1111.84

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

• CVE-2020-27171
• CVE-2020-27170

Related notices

• USN-4887-1: linux-image-5.4.0-1032-raspi, linux-image-5.3.0-1041-gke, linux-image-generic-hwe-20.04, linux-image-5.4.0-70-lowlatency, linux-image-oem-20.04-edge, linux-image-5.10.0-1019-oem, linux-image-5.4.0-1043-azure, linux-image-generic-hwe-20.04-edge, linux-image-raspi, linux-image-virtual-hwe-18.04-edge, linux-image-azure-edge, linux-image-5.4.0-1040-gcp, linux-image-generic-lpae, linux-image-5.8.0-1026-gcp, linux-image-gkeop, linux-oem-5.10, linux-image-lowlatency-hwe-20.04-edge, linux-image-aws-edge, linux-gcp, linux-image-5.4.0-1012-gkeop, linux-image-5.8.0-1019-raspi-nolpae, linux-image-snapdragon-hwe-18.04-edge, linux-image-gke-5.4, linux-image-virtual, linux-image-aws, linux-kvm, linux-aws, linux-image-gke, linux-oracle, linux-image-generic-64k, linux, linux-image-gkeop-5.3, linux-image-generic-lpae-hwe-20.04-edge, linux-azure-5.4, linux-image-lowlatency-hwe-18.04, linux-image-oracle-edge, linux-image-5.4.0-1041-aws, linux-gke-5.3, linux-azure, linux-image-virtual-hwe-18.04, linux-image-generic-lpae-hwe-18.04-edge, linux-image-5.8.0-48-generic, linux-image-oem-osp1, linux-image-virtual-hwe-20.04-edge, linux-image-raspi2, linux-image-oracle, linux-image-raspi-hwe-18.04, linux-image-5.8.0-1027-aws, linux-image-raspi2-hwe-18.04-edge, linux-image-gkeop-5.4, linux-image-5.8.0-1024-oracle, linux-image-kvm, linux-image-snapdragon-hwe-18.04, linux-image-5.4.0-1036-kvm, linux-image-generic-lpae-hwe-20.04, linux-gke-5.4, linux-image-5.8.0-48-lowlatency, linux-image-virtual-hwe-20.04, linux-image-5.4.0-1041-oracle, linux-image-5.3.0-72-generic, linux-hwe-5.4, linux-gcp-5.4, linux-raspi, linux-gkeop-5.4, linux-image-raspi2-hwe-18.04, linux-image-generic-hwe-18.04-edge, linux-raspi2-5.3, linux-image-5.4.0-70-generic, linux-aws-5.4, linux-image-raspi-nolpae, linux-raspi-5.4, linux-image-generic-64k-hwe-20.04-edge, linux-image-oem-20.04b, linux-image-generic-64k-hwe-20.04, linux-image-gcp, linux-image-lowlatency-hwe-20.04, linux-image-5.4.0-1039-gke, linux-image-5.8.0-1019-raspi, linux-image-5.8.0-1022-kvm, linux-hwe-5.8, linux-image-5.8.0-48-generic-64k, linux-oem-5.6, linux-image-lowlatency-hwe-18.04-edge, linux-oracle-5.4, linux-image-oem-20.04, linux-image-gcp-edge, linux-image-generic-hwe-18.04, linux-image-5.4.0-70-generic-lpae, linux-gkeop, linux-image-lowlatency, linux-image-5.8.0-48-generic-lpae, linux-image-azure, linux-image-gke-5.3, linux-image-5.6.0-1052-oem, linux-image-generic, linux-image-raspi-hwe-18.04-edge, linux-image-oem, linux-image-5.3.0-72-lowlatency, linux-image-5.8.0-1026-azure, linux-image-generic-lpae-hwe-18.04, linux-image-5.3.0-1038-raspi2, linux-hwe