LSN-0066-1: Kernel Live Patch Security Notice

Linux kernel vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

Ubuntu 18.04 LTS
Ubuntu 16.04 LTS
Ubuntu 14.04 ESM

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 – Linux kernel for Microsoft Azure Cloud systems
linux-oem – Linux kernel for OEM processors

Details

It was discovered that the virtual terminal implementation in the Linux
kernel did not properly handle resize events. A local attacker could use
this to expose sensitive information. (CVE-2020-8647)

It was discovered that the virtual terminal implementation in the Linux
kernel contained a race condition. A local attacker could possibly use this
to cause a denial of service (system crash) or expose sensitive
information. (CVE-2020-8648)

It was discovered that the virtual terminal implementation in the Linux
kernel did not properly handle resize events. A local attacker could use
this to expose sensitive information. (CVE-2020-8649)

Update instructions

The problem can be corrected by updating your kernel livepatch to the following
versions:

Ubuntu 18.04 LTS: aws – 66.1; generic – 66.1; lowlatency – 66.1; oem – 66.1
Ubuntu 16.04 LTS: aws – 66.1; azure – 66.1; generic – 66.1; lowlatency – 66.1
Ubuntu 14.04 ESM: generic – 66.1; lowlatency – 66.1

Support Information

Kernels older than the levels listed below do not receive livepatch
updates. If you are running a kernel version earlier than the one listed
below, please upgrade your kernel as soon as possible.

Ubuntu 18.04 LTS: linux – 4.15.0-69; linux-aws – 4.15.0-1054; linux-azure – 5.0.0-1025; linux-gcp – 5.0.0-1025; linux-oem – 4.15.0-1063
Ubuntu 16.04 LTS: linux – 4.4.0-168; linux-aws – 4.4.0-1098; linux-azure – 4.15.0-1063; linux-hwe – 4.15.0-69
Ubuntu 14.04 ESM: linux-lts-xenial – 4.4.0-168

References

Source: LSN-0066-1: Kernel Live Patch Security Notice

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