Ubuntu 5211-1: Linux kernel vulnerability | LinuxSecurity.com

Advisories

==========================================================================
Ubuntu Security Notice USN-5211-1
January 06, 2022

linux, linux-aws, linux-kvm, linux-lts-xenial vulnerability
==========================================================================

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

- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

Summary:

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

Software Description:
- linux: Linux kernel
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-kvm: Linux kernel for cloud environments
- linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty

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 16.04 ESM:
  linux-image-4.4.0-1099-kvm      4.4.0-1099.108
  linux-image-4.4.0-1134-aws      4.4.0-1134.148
  linux-image-4.4.0-218-generic   4.4.0-218.251
  linux-image-4.4.0-218-lowlatency  4.4.0-218.251
  linux-image-aws                 4.4.0.1134.139
  linux-image-generic             4.4.0.218.225
  linux-image-kvm                 4.4.0.1099.97
  linux-image-lowlatency          4.4.0.218.225
  linux-image-virtual             4.4.0.218.225

Ubuntu 14.04 ESM:
  linux-image-3.13.0-189-generic  3.13.0-189.240
  linux-image-3.13.0-189-generic-lpae  3.13.0-189.240
  linux-image-3.13.0-189-lowlatency  3.13.0-189.240
  linux-image-4.4.0-1098-aws      4.4.0-1098.103
  linux-image-4.4.0-218-generic   4.4.0-218.251~14.04.1
  linux-image-4.4.0-218-lowlatency  4.4.0-218.251~14.04.1
  linux-image-aws                 4.4.0.1098.96
  linux-image-generic             3.13.0.189.198
  linux-image-generic-lpae        3.13.0.189.198
  linux-image-generic-lts-xenial  4.4.0.218.189
  linux-image-lowlatency          3.13.0.189.198
  linux-image-lowlatency-lts-xenial  4.4.0.218.189
  linux-image-server              3.13.0.189.198
  linux-image-virtual             3.13.0.189.198
  linux-image-virtual-lts-xenial  4.4.0.218.189

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-5211-1
  CVE-2021-4002

Ubuntu 5211-1: Linux kernel vulnerability

January 5, 2022

Summary

A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 16.04 ESM - Ubuntu 14.04 ESM Summary: The system could be made to crash or run programs as an administrator. Software Description: - linux: Linux kernel - linux-aws: Linux kernel for Amazon Web Services (AWS) systems - linux-kvm: Linux kernel for cloud environments - linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty 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 16.04 ESM: linux-image-4.4.0-1099-kvm 4.4.0-1099.108 linux-image-4.4.0-1134-aws 4.4.0-1134.148 linux-image-4.4.0-218-generic 4.4.0-218.251 linux-image-4.4.0-218-lowlatency 4.4.0-218.251 linux-image-aws 4.4.0.1134.139 linux-image-generic 4.4.0.218.225 linux-image-kvm 4.4.0.1099.97 linux-image-lowlatency 4.4.0.218.225 linux-image-virtual 4.4.0.218.225 Ubuntu 14.04 ESM: linux-image-3.13.0-189-generic 3.13.0-189.240 linux-image-3.13.0-189-generic-lpae 3.13.0-189.240 linux-image-3.13.0-189-lowlatency 3.13.0-189.240 linux-image-4.4.0-1098-aws 4.4.0-1098.103 linux-image-4.4.0-218-generic 4.4.0-218.251~14.04.1 linux-image-4.4.0-218-lowlatency 4.4.0-218.251~14.04.1 linux-image-aws 4.4.0.1098.96 linux-image-generic 3.13.0.189.198 linux-image-generic-lpae 3.13.0.189.198 linux-image-generic-lts-xenial 4.4.0.218.189 linux-image-lowlatency 3.13.0.189.198 linux-image-lowlatency-lts-xenial 4.4.0.218.189 linux-image-server 3.13.0.189.198 linux-image-virtual 3.13.0.189.198 linux-image-virtual-lts-xenial 4.4.0.218.189 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-5211-1

CVE-2021-4002

Severity
Ubuntu Security Notice USN-5211-1

Package Information

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