USN-4255-1: Linux kernel vulnerabilities
28 January 2020
linux, linux-aws, linux-oem vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 18.04 LTS
Several security issues were fixed in the Linux kernel.
- linux - Linux kernel
- linux-aws - Linux kernel for Amazon Web Services (AWS) systems
- linux-oem - Linux kernel for OEM processors
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)
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 - 18.104.22.1688.59
- linux-image-aws-lts-18.04 - 22.214.171.1248.59
- linux-image-generic - 126.96.36.199.78
- linux-image-generic-lpae - 188.8.131.52.78
- linux-image-lowlatency - 184.108.40.206.78
- linux-image-oem - 220.127.116.117.71
- linux-image-powerpc-e500mc - 18.104.22.168.78
- linux-image-powerpc-smp - 22.214.171.124.78
- linux-image-powerpc64-emb - 126.96.36.199.78
- linux-image-powerpc64-smp - 188.8.131.52.78
- linux-image-virtual - 184.108.40.206.78
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.