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Ubuntu 18.04 LTS: USN-4465-1 Critical: Linux Kernel DoS Issues

ubuntu
Calendar Grey August 18, 2020
Dist Ubuntu Esm H88
Ubuntu 20.04 LTS updates released; urgent security patches issued after advisory USN-4567-1 concerning vulnerabilities in the Linux kernel.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-azure-5.3: Linux kernel for microsoft azure cloud systems

- linux-gke-5.3: Linux kernel for Google Container Engine (GKE) systems

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

Details:

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

kernel did not properly validate meta data in some circumstances. An

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

mounted, could cause a denial of service. (CVE-2020-12655)

It was discovered that the bcache subsystem in the Linux kernel did not

properly release a lock in some error conditions. A local attacker could

possibly use this to cause a denial of service. (CVE-2020-12771)

Kyungtae Kim discovered that the USB testing driver in the Linux kernel did

not properly deallocate memory on disconnect events. A physically proximate

attacker could use this to cause a denial of service (memory exhaustion).

(CVE-2020...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service security issue ubuntu linux kernel

Update Instructions

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

Ubuntu 18.04 LTS:
  linux-image-5.3.0-1033-gke      5.3.0-1033.35
  linux-image-5.3.0-1035-azure    5.3.0-1035.36
  linux-image-5.3.0-65-generic    5.3.0-65.59
  linux-image-5.3.0-65-lowlatency  5.3.0-65.59
  linux-image-azure               5.3.0.1035.31
  linux-image-gke-5.3             5.3.0.1033.18
  linux-image-gkeop-5.3           5.3.0.65.121

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-4465-1

CVE-2020-12655, CVE-2020-12771, CVE-2020-15393

Severity
critical
Lowest
Low
Medium
High
Critical

August 19, 2020

Topics%20covered

Topics Covered

security advisory denial of service security issue ubuntu linux kernel

Package Information

https://launchpad.net/ubuntu/+source/linux-azure-5.3/5.3.0-1035.36
https://launchpad.net/ubuntu/+source/linux-gke-5.3/5.3.0-1033.35
https://launchpad.net/ubuntu/+source/linux-hwe/5.3.0-65.59

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