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Ubuntu 18.04 LTS: USN-4069-2 Critical: HWE Kernel Issues

ubuntu
Calendar Grey August 1, 2019
Dist Ubuntu Esm H88
Multiple vulnerabilities addressed in Linux kernel for Ubuntu 18.04 LTS via update USN-4069-2. Understand the methods to secure your device.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-hwe: Linux hardware enablement (HWE) kernel

Details:

USN-4069-1 fixed vulnerabilities in the Linux kernel for Ubuntu 19.04.

This update provides the corresponding updates for the Linux Hardware

Enablement (HWE) kernel from Ubuntu 19.04 for Ubuntu 18.04 LTS.

It was discovered that an integer overflow existed in the Linux kernel when

reference counting pages, leading to potential use-after-free issues. A

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

or possibly execute arbitrary code. (CVE-2019-11487)

Jann Horn discovered that a race condition existed in the Linux kernel when

performing core dumps. A local attacker could use this to cause a denial of

service (system crash) or expose sensitive information. (CVE-2019-11599)

It was discovered that the ext4 file system implementation in the Linux

kernel did not properly zero out memory in some situations. A local

attack...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu kernel system update sensitive information HWE

Update Instructions

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

Ubuntu 18.04 LTS:
  linux-image-5.0.0-23-generic    5.0.0-23.24~18.04.1
  linux-image-5.0.0-23-generic-lpae  5.0.0-23.24~18.04.1
  linux-image-5.0.0-23-lowlatency  5.0.0-23.24~18.04.1
  linux-image-generic-hwe-18.04   5.0.0.23.80
  linux-image-generic-lpae-hwe-18.04  5.0.0.23.80
  linux-image-lowlatency-hwe-18.04  5.0.0.23.80
  linux-image-snapdragon-hwe-18.04  5.0.0.23.80
  linux-image-virtual-hwe-18.04   5.0.0.23.80

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-4069-2

https://ubuntu.com/security/notices/USN-4069-1

CVE-2019-11487, CVE-2019-11599, CVE-2019-11833, CVE-2019-11884

Severity
critical
Lowest
Low
Medium
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Critical

August 01, 2019

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu kernel system update sensitive information HWE

Package Information

https://launchpad.net/ubuntu/+source/linux-hwe/5.0.0-23.24~18.04.1

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