USN-4255-2: Linux kernel (HWE) vulnerabilities
linux-hwe, linux-aws-hwe vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 16.04 LTS
Several security issues were fixed in the Linux kernel.
- linux-aws-hwe – Linux kernel for Amazon Web Services (AWS-HWE) systems
- linux-hwe – Linux hardware enablement (HWE) kernel
USN-4255-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04
LTS. This update provides the corresponding updates for the Linux
Hardware Enablement (HWE) kernel from Ubuntu 18.04 LTS for Ubuntu
It was discovered that the Linux kernel did not properly clear data
structures on context switches for certain Intel graphics processors. A
local attacker could use this to expose sensitive information.
It was discovered that a race condition can lead to a use-after-free while
destroying GEM contexts in the i915 driver for the Linux kernel. A local
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2020-7053)
The problem can be corrected by updating your system to the following package versions:
- Ubuntu 16.04 LTS
- linux-image-4.15.0-1058-aws – 4.15.0-1058.60~16.04.1
- linux-image-4.15.0-76-generic – 4.15.0-76.86~16.04.1
- linux-image-4.15.0-76-generic-lpae – 4.15.0-76.86~16.04.1
- linux-image-4.15.0-76-lowlatency – 4.15.0-76.86~16.04.1
- linux-image-aws-hwe – 18.104.22.1688.58
- linux-image-generic-hwe-16.04 – 22.214.171.124.96
- linux-image-generic-lpae-hwe-16.04 – 126.96.36.199.96
- linux-image-lowlatency-hwe-16.04 – 188.8.131.52.96
- linux-image-oem – 184.108.40.206.96
- linux-image-virtual-hwe-16.04 – 220.127.116.11.96
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
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.