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Ubuntu 18.04 LTS USN-4710-1: Critical Kernel Denial of Service

ubuntu
Calendar Grey January 28, 2021
Dist Ubuntu Esm H88
Investigate the significant vulnerability in the Linux kernel impacting Ubuntu 18.04, which may lead to potential system failures due to memory-related problems.
The system could be made to crash under certain conditions.

Summary

The system could be made to crash under certain conditions.

Software Description:

- linux: Linux kernel

Details:

Kiyin (尹亮) discovered that the perf subsystem in the Linux kernel did

not properly deallocate memory in some situations. A privileged attacker

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

Topics%20covered

Topics Covered

security advisory denial of service kernel ubuntu memory exhaustion system crash linux linux issue

Update Instructions

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-135-generic  4.15.0-135.139
  linux-image-4.15.0-135-generic-lpae  4.15.0-135.139
  linux-image-4.15.0-135-lowlatency  4.15.0-135.139
  linux-image-generic             4.15.0.135.122
  linux-image-generic-lpae        4.15.0.135.122
  linux-image-lowlatency          4.15.0.135.122
  linux-image-powerpc-e500mc      4.15.0.135.122
  linux-image-powerpc-smp         4.15.0.135.122
  linux-image-powerpc64-emb       4.15.0.135.122
  linux-image-powerpc64-smp       4.15.0.135.122
  linux-image-virtual             4.15.0.135.122

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-4710-1

CVE-2020-25704

Severity
critical
Lowest
Low
Medium
High
Critical

January 28, 2021

Topics%20covered

Topics Covered

security advisory denial of service kernel ubuntu memory exhaustion system crash linux linux issue

Package Information

https://launchpad.net/ubuntu/+source/linux/4.15.0-135.139

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