LSN-0066-1: Kernel Live Patch Security Notice
1 May 2020
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