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USN-4342-1: Linux kernel vulnerabilities

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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:

Summary

Several security issues were fixed in the Linux kernel.

Software Description

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

Source: USN-4342-1: Linux kernel vulnerabilities

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