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Ubuntu 18.04 LTS: USN-4462-1 Critical: Linux Kernel Denial of Service

ubuntu
Calendar Grey August 18, 2020
Dist Ubuntu Esm H88
Ubuntu USN-4462-2 resolves a kernel vulnerability that may cause system instability and potential service interruptions. It's advisable to update your system.
The system could be made to crash under certain conditions.

Summary

The system could be made to crash under certain conditions.

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 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.

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu kernel 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-5.0.0-1046-gke      5.0.0-1046.47
  linux-image-5.0.0-1067-oem-osp1  5.0.0-1067.72
  linux-image-gke-5.0             5.0.0.1046.31
  linux-image-oem-osp1            5.0.0.1067.65

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-4462-1

CVE-2020-12771

Severity
critical
Lowest
Low
Medium
High
Critical

August 18, 2020

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu kernel system crash linux-gke-5.0 linux-oem-osp1

Package Information

https://launchpad.net/ubuntu/+source/linux-gke-5.0/5.0.0-1046.47
https://launchpad.net/ubuntu/+source/linux-oem-osp1/5.0.0-1067.72

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