๐ USN-4363-1: Linux kernel vulnerabilities
๐ก Newskategorie: Unix Server
๐ Quelle: usn.ubuntu.com
linux, linux-aws, linux-aws-hwe, linux-gcp, linux-gke-4.15, linux-hwe, linux-oem, linux-oracle, linux-snapdragon vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 18.04 LTS
- Ubuntu 16.04 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-gke-4.15 - Linux kernel for Google Container Engine (GKE) systems
- linux-oem - Linux kernel for OEM systems
- linux-oracle - Linux kernel for Oracle Cloud systems
- linux-snapdragon - Linux kernel for Qualcomm Snapdragon processors
- linux-aws-hwe - Linux kernel for Amazon Web Services (AWS-HWE) systems
- linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
- linux-hwe - Linux hardware enablement (HWE) kernel
Details
It was discovered that the Serial CAN interface driver in the Linux kernel did not properly initialize data. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2020-11494)
It was discovered that the linux kernel did not properly validate certain mount options to the tmpfs virtual memory file system. A local attacker with the ability to specify mount options could use this to cause a denial of service (system crash). (CVE-2020-11565)
David Gibson discovered that the Linux kernel on Power9 CPUs did not properly save and restore Authority Mask registers state in some situations. A local attacker in a guest VM could use this to cause a denial of service (host system crash). (CVE-2020-11669)
It was discovered that the block layer in the Linux kernel contained a race condition leading to a use-after-free vulnerability. A local attacker could possibly use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2020-12657)
Update instructions
The problem can be corrected by updating your system to the following package versions:
- Ubuntu 18.04 LTS
- linux-image-4.15.0-101-generic - 4.15.0-101.102
- linux-image-4.15.0-101-generic-lpae - 4.15.0-101.102
- linux-image-4.15.0-101-lowlatency - 4.15.0-101.102
- linux-image-4.15.0-1039-oracle - 4.15.0-1039.43
- linux-image-4.15.0-1059-gke - 4.15.0-1059.62
- linux-image-4.15.0-1067-aws - 4.15.0-1067.71
- linux-image-4.15.0-1079-snapdragon - 4.15.0-1079.86
- linux-image-4.15.0-1081-oem - 4.15.0-1081.91
- linux-image-aws-lts-18.04 - 4.15.0.1067.70
- linux-image-generic - 4.15.0.101.91
- linux-image-generic-lpae - 4.15.0.101.91
- linux-image-gke - 4.15.0.1059.63
- linux-image-gke-4.15 - 4.15.0.1059.63
- linux-image-lowlatency - 4.15.0.101.91
- linux-image-oem - 4.15.0.1081.85
- linux-image-oracle-lts-18.04 - 4.15.0.1039.48
- linux-image-powerpc-e500mc - 4.15.0.101.91
- linux-image-powerpc-smp - 4.15.0.101.91
- linux-image-powerpc64-emb - 4.15.0.101.91
- linux-image-powerpc64-smp - 4.15.0.101.91
- linux-image-snapdragon - 4.15.0.1079.82
- linux-image-virtual - 4.15.0.101.91
- Ubuntu 16.04 LTS
- linux-image-4.15.0-101-generic - 4.15.0-101.102~16.04.1
- linux-image-4.15.0-101-generic-lpae - 4.15.0-101.102~16.04.1
- linux-image-4.15.0-101-lowlatency - 4.15.0-101.102~16.04.1
- linux-image-4.15.0-1039-oracle - 4.15.0-1039.43~16.04.1
- linux-image-4.15.0-1067-aws - 4.15.0-1067.71~16.04.1
- linux-image-4.15.0-1071-gcp - 4.15.0-1071.81~16.04.1
- linux-image-aws-hwe - 4.15.0.1067.67
- linux-image-gcp - 4.15.0.1071.77
- linux-image-generic-hwe-16.04 - 4.15.0.101.108
- linux-image-generic-lpae-hwe-16.04 - 4.15.0.101.108
- linux-image-gke - 4.15.0.1071.77
- linux-image-lowlatency-hwe-16.04 - 4.15.0.101.108
- linux-image-oem - 4.15.0.101.108
- linux-image-oracle - 4.15.0.1039.32
- linux-image-virtual-hwe-16.04 - 4.15.0.101.108
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.