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AUSCERT External Security Bulletin Redistribution
ESB-2020.1472
USN-4342-1: Linux kernel vulnerabilities
29 April 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: kernel
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Denial of Service -- Existing Account
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-11884 CVE-2020-10942 CVE-2020-9383
CVE-2020-8992 CVE-2020-8648 CVE-2019-19768
CVE-2019-16234
Reference: ESB-2020.1257
ESB-2020.1216
Original Bulletin:
https://usn.ubuntu.com/4342-1/
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USN-4342-1: Linux kernel vulnerabilities
28 April 2020
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:
o Ubuntu 19.10
o Ubuntu 18.04 LTS
Summary
Several security issues were fixed in the Linux kernel.
Software Description
o linux - Linux kernel
o linux-aws - Linux kernel for Amazon Web Services (AWS) systems
o linux-azure - Linux kernel for Microsoft Azure Cloud systems
o linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
o linux-kvm - Linux kernel for cloud environments
o linux-raspi2 - Linux kernel for Raspberry Pi 2
o linux-gke-5.3 - Linux kernel for Google Container Engine (GKE) systems
o linux-hwe - Linux hardware enablement (HWE) kernel
o 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.
References
o CVE-2019-16234
o CVE-2019-19768
o CVE-2020-10942
o CVE-2020-11884
o CVE-2020-8648
o CVE-2020-8992
o CVE-2020-9383
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