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Ubuntu: 5062-1 Moderate Admin Access Risk In Linux Kernel

ubuntu
Calendar Grey September 7, 2021
Dist Ubuntu Esm H88
Security hole in Linux kernel impacting Ubuntu 16.04 and 14.04 could lead to system crashes or unauthorized access. Users advised to install updates for protection.
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: 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:

Maxim Levitsky discovered that the KVM hypervisor implementation for AMD

processors in the Linux kernel did not properly prevent a guest VM from

enabling AVIC in nested guest VMs. An attacker in a guest VM could use this

to write to portions of the host's physical memory.

Topics%20covered

Topics Covered

security advisory ubuntu moderate risk administrative access linux kernel

Update Instructions

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

Ubuntu 16.04 ESM:
  linux-image-4.4.0-1097-kvm      4.4.0-1097.106
  linux-image-4.4.0-1132-aws      4.4.0-1132.146
  linux-image-4.4.0-214-generic   4.4.0-214.246
  linux-image-4.4.0-214-lowlatency  4.4.0-214.246
  linux-image-aws                 4.4.0.1132.137
  linux-image-generic             4.4.0.214.221
  linux-image-kvm                 4.4.0.1097.95
  linux-image-lowlatency          4.4.0.214.221
  linux-image-virtual             4.4.0.214.221

Ubuntu 14.04 ESM:
  linux-image-4.4.0-1096-aws      4.4.0-1096.101
  linux-image-4.4.0-214-generic   4.4.0-214.246~14.04.1
  linux-image-4.4.0-214-lowlatency  4.4.0-214.246~14.04.1
  linux-image-aws                 4.4.0.1096.94
  linux-image-generic-lts-xenial  4.4.0.214.187
  linux-image-lowlatency-lts-xenial  4.4.0.214.187
  linux-image-virtual-lts-xenial  4.4.0.214.187

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-5062-1

CVE-2021-3653

September 08, 2021

Topics%20covered

Topics Covered

security advisory ubuntu moderate risk administrative access linux kernel

Package Information

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