USN-4342-1: Linux kernel vulnerabilities
linux, linux-aws, linux-azure, linux-gcp, linux-gke-5.3, linux-hwe, linux-kvm, linux-raspi2, linux-raspi2-5.3 vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 19.10
- 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-azure – Linux kernel for Microsoft Azure Cloud systems
- linux-gcp – Linux kernel for Google Cloud Platform (GCP) systems
- linux-kvm – Linux kernel for cloud environments
- linux-raspi2 – Linux kernel for Raspberry Pi 2
- linux-gke-5.3 – Linux kernel for Google Container Engine (GKE) systems
- linux-hwe – Linux hardware enablement (HWE) kernel
- linux-raspi2-5.3 – Linux kernel for Raspberry Pi 2
Details
Al Viro discovered that the Linux kernel for s390x systems did not properly
perform page table upgrades for kernel sections that use secondary address
mode. A local attacker could use this to cause a denial of service (system
crash) or execute arbitrary code. (CVE-2020-11884)
It was discovered that the Intel Wi-Fi driver in the Linux kernel did not
properly check for errors in some situations. A local attacker could
possibly use this to cause a denial of service (system crash).
(CVE-2019-16234)
Tristan Madani discovered that the block I/O tracing implementation in the
Linux kernel contained a race condition. A local attacker could use this to
cause a denial of service (system crash) or possibly expose sensitive
information. (CVE-2019-19768)
It was discovered that the vhost net driver in the Linux kernel contained a
stack buffer overflow. A local attacker with the ability to perform ioctl()
calls on /dev/vhost-net could use this to cause a denial of service (system
crash). (CVE-2020-10942)
It was discovered that the virtual terminal implementation in the Linux
kernel contained a race condition. A local attacker could possibly use this
to cause a denial of service (system crash) or expose sensitive
information. (CVE-2020-8648)
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)
Jordy Zomer discovered that the floppy driver in the Linux kernel did not
properly check for errors in some situations. A local attacker could
possibly use this to cause a denial of service (system crash) or possibly
expose sensitive information. (CVE-2020-9383)
Update instructions
The problem can be corrected by updating your system to the following package versions:
- Ubuntu 19.10
- linux-image-5.3.0-1016-kvm – 5.3.0-1016.17
- linux-image-5.3.0-1017-aws – 5.3.0-1017.18
- linux-image-5.3.0-1018-gcp – 5.3.0-1018.19
- linux-image-5.3.0-1020-azure – 5.3.0-1020.21
- linux-image-5.3.0-1023-raspi2 – 5.3.0-1023.25
- linux-image-5.3.0-51-generic – 5.3.0-51.44
- linux-image-5.3.0-51-generic-lpae – 5.3.0-51.44
- linux-image-5.3.0-51-lowlatency – 5.3.0-51.44
- linux-image-5.3.0-51-snapdragon – 5.3.0-51.44
- linux-image-aws – 5.3.0.1017.19
- linux-image-azure – 5.3.0.1020.39
- linux-image-gcp – 5.3.0.1018.19
- linux-image-generic – 5.3.0.51.42
- linux-image-generic-lpae – 5.3.0.51.42
- linux-image-gke – 5.3.0.1018.19
- linux-image-kvm – 5.3.0.1016.18
- linux-image-lowlatency – 5.3.0.51.42
- linux-image-raspi2 – 5.3.0.1023.20
- linux-image-snapdragon – 5.3.0.51.42
- linux-image-virtual – 5.3.0.51.42
- Ubuntu 18.04 LTS
- linux-image-5.3.0-1018-gke – 5.3.0-1018.19~18.04.1
- linux-image-5.3.0-1023-raspi2 – 5.3.0-1023.25~18.04.1
- linux-image-5.3.0-51-generic – 5.3.0-51.44~18.04.2
- linux-image-5.3.0-51-generic-lpae – 5.3.0-51.44~18.04.2
- linux-image-5.3.0-51-lowlatency – 5.3.0-51.44~18.04.2
- linux-image-generic-hwe-18.04 – 5.3.0.51.104
- linux-image-generic-lpae-hwe-18.04 – 5.3.0.51.104
- linux-image-gke-5.3 – 5.3.0.1018.8
- linux-image-lowlatency-hwe-18.04 – 5.3.0.51.104
- linux-image-raspi2-hwe-18.04 – 5.3.0.1023.12
- linux-image-snapdragon-hwe-18.04 – 5.3.0.51.104
- linux-image-virtual-hwe-18.04 – 5.3.0.51.104
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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