USN-4324-1: Linux kernel vulnerabilities
linux-aws, linux-aws-hwe, linux-azure, linux-gcp, linux-gke-4.15, linux-kvm, linux-oem, linux-oracle, linux-raspi2, linux-snapdragon 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-aws – Linux kernel for Amazon Web Services (AWS) systems
- linux-gke-4.15 – Linux kernel for Google Container Engine (GKE) systems
- linux-kvm – Linux kernel for cloud environments
- linux-oem – Linux kernel for OEM processors
- linux-oracle – Linux kernel for Oracle Cloud systems
- linux-raspi2 – Linux kernel for Raspberry Pi 2
- linux-snapdragon – Linux kernel for Snapdragon processors
- linux-aws-hwe – Linux kernel for Amazon Web Services (AWS-HWE) systems
- linux-azure – Linux kernel for Microsoft Azure Cloud systems
- linux-gcp – Linux kernel for Google Cloud Platform (GCP) systems
Details
Al Viro discovered that the vfs layer in the Linux kernel contained a use-
after-free vulnerability. A local attacker could use this to cause a denial
of service (system crash) or possibly expose sensitive information (kernel
memory). (CVE-2020-8428)
Shijie Luo discovered that the ext4 file system implementation in the Linux
kernel did not properly check for a too-large journal size. An attacker
could use this to construct a malicious ext4 image that, when mounted,
could cause a denial of service (soft lockup). (CVE-2020-8992)
Update instructions
The problem can be corrected by updating your system to the following package versions:
- Ubuntu 18.04 LTS
- linux-image-4.15.0-1037-oracle – 4.15.0-1037.41
- linux-image-4.15.0-1057-gke – 4.15.0-1057.60
- linux-image-4.15.0-1058-kvm – 4.15.0-1058.59
- linux-image-4.15.0-1060-raspi2 – 4.15.0-1060.64
- linux-image-4.15.0-1065-aws – 4.15.0-1065.69
- linux-image-4.15.0-1076-snapdragon – 4.15.0-1076.83
- linux-image-4.15.0-1079-oem – 4.15.0-1079.89
- linux-image-aws – 4.15.0.1065.67
- linux-image-aws-lts-18.04 – 4.15.0.1065.67
- linux-image-gke – 4.15.0.1057.61
- linux-image-gke-4.15 – 4.15.0.1057.61
- linux-image-kvm – 4.15.0.1058.58
- linux-image-oem – 4.15.0.1079.83
- linux-image-oracle-lts-18.04 – 4.15.0.1037.45
- linux-image-raspi2 – 4.15.0.1060.58
- linux-image-snapdragon – 4.15.0.1076.79
- Ubuntu 16.04 LTS
- linux-image-4.15.0-1037-oracle – 4.15.0-1037.41~16.04.1
- linux-image-4.15.0-1060-gcp – 4.15.0-1060.64
- linux-image-4.15.0-1065-aws – 4.15.0-1065.69~16.04.1
- linux-image-4.15.0-1077-azure – 4.15.0-1077.82
- linux-image-aws-hwe – 4.15.0.1065.65
- linux-image-azure – 4.15.0.1077.80
- linux-image-azure-edge – 4.15.0.1077.80
- linux-image-gcp – 4.15.0.1060.74
- linux-image-gke – 4.15.0.1060.74
- linux-image-oracle – 4.15.0.1037.30
- Ubuntu 14.04 ESM
- linux-image-4.15.0-1077-azure – 4.15.0-1077.82~14.04.1
- linux-image-azure – 4.15.0.1077.62
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-4324-1: Linux kernel vulnerabilities
