USN-4255-1: Linux kernel vulnerabilities
linux, linux-aws, linux-oem vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 18.04 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-oem – Linux kernel for OEM processors
Details
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.
(CVE-2019-14615)
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)
Update instructions
The problem can be corrected by updating your system to the following package versions:
- Ubuntu 18.04 LTS
- linux-image-4.15.0-1058-aws – 4.15.0-1058.60
- linux-image-4.15.0-1067-oem – 4.15.0-1067.77
- linux-image-4.15.0-76-generic – 4.15.0-76.86
- linux-image-4.15.0-76-generic-lpae – 4.15.0-76.86
- linux-image-4.15.0-76-lowlatency – 4.15.0-76.86
- linux-image-aws – 4.15.0.1058.59
- linux-image-aws-lts-18.04 – 4.15.0.1058.59
- linux-image-generic – 4.15.0.76.78
- linux-image-generic-lpae – 4.15.0.76.78
- linux-image-lowlatency – 4.15.0.76.78
- linux-image-oem – 4.15.0.1067.71
- linux-image-powerpc-e500mc – 4.15.0.76.78
- linux-image-powerpc-smp – 4.15.0.76.78
- linux-image-powerpc64-emb – 4.15.0.76.78
- linux-image-powerpc64-smp – 4.15.0.76.78
- linux-image-virtual – 4.15.0.76.78
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.
References
Source: USN-4255-1: Linux kernel vulnerabilities
