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Ubuntu Security Notice USN-5572-1

Ubuntu Security Notice USN-5572-1
Posted Aug 19, 2022
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5572-1 - 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. 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.

tags | advisory, kernel, local
systems | linux, ubuntu
advisories | CVE-2022-26365, CVE-2022-33740, CVE-2022-33741
SHA-256 | 872a20bd18de5b36c76ff27661a51d424a4716b6709a166fd463d3e661c283f2

Ubuntu Security Notice USN-5572-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-5572-1
August 18, 2022

linux-aws vulnerabilities
==========================================================================

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

- Ubuntu 16.04 ESM

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems

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 local attacker could use this to cause a denial of service
(guest crash) or expose sensitive information (guest kernel memory).
(CVE-2022-33741)

Update instructions:

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

Ubuntu 16.04 ESM:
linux-image-4.4.0-1148-aws 4.4.0-1148.163
linux-image-aws 4.4.0.1148.152

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-5572-1
CVE-2022-26365, CVE-2022-33740, CVE-2022-33741
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