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Ubuntu 16.04 ESM USN-5579-1 Moderate: Kernel Info Exposed

ubuntu
Calendar Grey August 24, 2022
Dist Ubuntu Esm H88
Tackling various core vulnerabilities in Ubuntu to fortify systems against possible breaches and unapproved intrusions.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux: Linux kernel

- linux-kvm: Linux kernel for cloud environments

- linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty

Details:

Roger Pau Monné discovered that the Xen virtual block driver in the

Linux kernel did not properly initialize memory pages to be used for

shared communication with the backend. A local attacker could use this

to expose sensitive information (guest kernel memory). (CVE-2022-26365)

Roger Pau Monné discovered that the Xen paravirtualization frontend in

the Linux kernel did not properly initialize memory pages to be used for

shared communication with the backend. A local attacker could use this

to expose sensitive information (guest kernel memory). (CVE-2022-33740)

It was discovered that the Xen paravirtualization frontend in the Linux

kernel incorrectly shared unrelated data when communicating with certain

backends. A loc...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service kernel update information exposure ubuntu

Update Instructions

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

Ubuntu 16.04 ESM:
   linux-image-4.4.0-1113-kvm      4.4.0-1113.123
   linux-image-4.4.0-233-generic   4.4.0-233.267
   linux-image-4.4.0-233-lowlatency  4.4.0-233.267
   linux-image-generic             4.4.0.233.239
   linux-image-kvm                 4.4.0.1113.110
   linux-image-lowlatency          4.4.0.233.239
   linux-image-virtual             4.4.0.233.239

Ubuntu 14.04 ESM:
   linux-image-4.4.0-233-generic   4.4.0-233.267~14.04.1
   linux-image-4.4.0-233-lowlatency  4.4.0-233.267~14.04.1
   linux-image-generic-lts-xenial  4.4.0.233.202
   linux-image-lowlatency-lts-xenial  4.4.0.233.202
   linux-image-virtual-lts-xenial  4.4.0.233.202

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-5579-1

CVE-2022-26365, CVE-2022-33740, CVE-2022-33741

Severity
important
Lowest
Low
Medium
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Critical

August 24, 2022

Topics%20covered

Topics Covered

security advisory denial of service kernel update information exposure ubuntu

Package Information

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