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Ubuntu 20.04 LTS: USN-5206-1 Critical Vulnerability in Linux Kernel Access

ubuntu
Calendar Grey January 5, 2022
Dist Ubuntu Esm H88
Ubuntu 20.04 releases a security update for linux-oem-5.14, addressing a vulnerability that may lead to system crashes or enable unauthorized access.
The system could be made to crash or run programs as an administrator.

Summary

The system could be made to crash or run programs as an administrator.

Software Description:

- linux-oem-5.14: Linux kernel for OEM systems

Details:

Nadav Amit discovered that the hugetlb implementation in the Linux kernel

did not perform TLB flushes under certain conditions. A local attacker

could use this to leak or alter data from other processes that use huge

pages.

Topics%20covered

Topics Covered

security advisory critical ubuntu system crash administrative access linux kernel

Update Instructions

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

Ubuntu 20.04 LTS:
  linux-image-5.14.0-1013-oem     5.14.0-1013.13
  linux-image-oem-20.04d          5.14.0.1013.13

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-5206-1

CVE-2021-4002

Severity
critical
Lowest
Low
Medium
High
Critical

January 05, 2022

Topics%20covered

Topics Covered

security advisory critical ubuntu system crash administrative access linux kernel

Package Information

https://launchpad.net/ubuntu/+source/linux-oem-5.14/5.14.0-1013.13

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