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Ubuntu 18.04 LTS: USN-4439-1 Critical: Denial Of Service Risks

ubuntu
Calendar Grey July 27, 2020
Dist Ubuntu Esm H88
=========================================================================Ubuntu Security Notice USN-
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-gke-5.0: Linux kernel for Google Container Engine (GKE) systems

- linux-oem-osp1: Linux kernel for OEM systems

Details:

It was discovered that the network block device (nbd) implementation in the

Linux kernel did not properly check for error conditions in some

situations. An attacker could possibly use this to cause a denial of

service (system crash). (CVE-2019-16089)

It was discovered that the btrfs file system implementation in the Linux

kernel did not properly validate file system metadata in some situations.

An attacker could use this to construct a malicious btrfs image that, when

mounted, could cause a denial of service (system crash). (CVE-2019-19036)

It was discovered that the kernel->user space relay implementation in the

Linux kernel did not properly check return values in some situations. A

local attacker could possibly use this to cause a denial of service (system

crash). (CVE-...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory doS kernel ubuntu system crash linux-gke-5.0 linux-oem-osp1

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 18.04 LTS:
  linux-image-5.0.0-1045-gke      5.0.0-1045.46
  linux-image-5.0.0-1065-oem-osp1  5.0.0-1065.70
  linux-image-gke-5.0             5.0.0.1045.30
  linux-image-oem-osp1            5.0.0.1065.63

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

https://ubuntu.com/security/notices/USN-4439-1

CVE-2019-12380, CVE-2019-16089, CVE-2019-19036, CVE-2019-19462,

CVE-2019-20810, CVE-2019-20908, CVE-2020-10732, CVE-2020-10757,

CVE-2020-10766, CVE-2020-10767, CVE-2020-10768, CVE-2020-11935,

CVE-2020-13974, CVE-2020-15780

Severity
critical
Lowest
Low
Medium
High
Critical

July 27, 2020

Topics%20covered

Topics Covered

security advisory doS kernel ubuntu system crash linux-gke-5.0 linux-oem-osp1

Package Information

https://launchpad.net/ubuntu/+source/linux-gke-5.0/5.0.0-1045.46
https://launchpad.net/ubuntu/+source/linux-oem-osp1/5.0.0-1065.70

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