USN-4363-1: Linux kernel vulnerabilities
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.
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