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Ubuntu Security Notice USN-4890-1

Ubuntu Security Notice USN-4890-1
Posted Mar 25, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4890-1 - 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. 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. Various other issues were also addressed.

tags | advisory, kernel, local
systems | linux, ubuntu
advisories | CVE-2020-27170, CVE-2020-27171
MD5 | 99fda04e62a9dedd76b21402a376b8ad

Ubuntu Security Notice USN-4890-1

Change Mirror Download
=========================================================================
Ubuntu Security Notice USN-4890-1
March 25, 2021

linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15,
linux-dell300x, linux-gcp, linux-gcp-4.15, linux-hwe, linux-kvm,
linux-oracle, linux-signed, linux-snapdragon vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

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

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 LTS:
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-4.15.0-1088-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-powerpc-e500mc 4.15.0.140.127
linux-image-powerpc-smp 4.15.0.140.127
linux-image-powerpc64-emb 4.15.0.140.127
linux-image-powerpc64-smp 4.15.0.140.127
linux-image-snapdragon 4.15.0.1099.102
linux-image-virtual 4.15.0.140.127

Ubuntu 16.04 LTS:
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

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:
https://ubuntu.com/security/notices/USN-4890-1
CVE-2020-27170, CVE-2020-27171

Package Information:
https://launchpad.net/ubuntu/+source/linux/4.15.0-140.144
https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1097.104
https://launchpad.net/ubuntu/+source/linux-azure-4.15/4.15.0-1111.123
https://launchpad.net/ubuntu/+source/linux-dell300x/4.15.0-1015.19
https://launchpad.net/ubuntu/+source/linux-gcp-4.15/4.15.0-1096.109
https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1088.90
https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1068.76
https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1099.108
https://launchpad.net/ubuntu/+source/linux-aws-hwe/4.15.0-1097.104~16.04.1
https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1111.123~16.04.1
https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1096.109~16.04.1
https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-140.144~16.04.1
https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1068.76~16.04.1
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