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USN-4363-1: Linux kernel vulnerabilities

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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:

Summary

Several security issues were fixed in the Linux kernel.

Software Description

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.

References

Source: USN-4363-1: Linux kernel vulnerabilities

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