Ubuntu 5206-1: Linux kernel (OEM) vulnerability

Advisories

==========================================================================
Ubuntu Security Notice USN-5206-1
January 05, 2022

linux-oem-5.14 vulnerability
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS

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.

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

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

Ubuntu 5206-1: Linux kernel (OEM) vulnerability

January 5, 2022

Summary

A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 20.04 LTS 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.

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
Ubuntu Security Notice USN-5206-1

Package Information

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

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