Linux kernel: CVSS (Max): 4.1

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2023.2517
               USN-6056-1: Linux kernel (OEM) vulnerability
                                8 May 2023

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Linux kernel
Publisher:         Ubuntu
Operating System:  Ubuntu
Resolution:        Patch/Upgrade
CVE Names:         CVE-2023-1859  

Original Bulletin: 
   https://ubuntu.com/security/notices/USN-6056-1

Comment: CVSS (Max):  4.1 CVE-2023-1859 (CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H)
         CVSS Source: Red Hat
         Calculator:  https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H

- --------------------------BEGIN INCLUDED TEXT--------------------

USN-6056-1: Linux kernel (OEM) vulnerability

5 May 2023

The guest VM system could be made to crash or expose sensitive information.

Releases

  o Ubuntu 22.04 LTS

Packages

  o linux-oem-6.1 - Linux kernel for OEM systems

Details

It was discovered that a race condition existed in the Xen transport layer
implementation for the 9P file system protocol in the Linux kernel, leading
to a use-after-free vulnerability. A local attacker could use this to cause
a denial of service (guest crash) or expose sensitive information (guest
kernel memory).

Update instructions

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

Ubuntu 22.04

  o linux-image-oem-22.04c - 6.1.0.1010.10
  o linux-image-6.1.0-1010-oem - 6.1.0-1010.10

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

  o CVE-2023-1859

- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

        https://www.auscert.org.au/bulletins/

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: https://auscert.org.au/gpg-key/

iQIVAwUBZFgsg8kNZI30y1K9AQg5NQ/+PuPHkT52S9A3R2s28eWz/Ow3kqNyrP89
75MtvJmO2u9olURRf3ak4a/DdLlGV6DzTdi7MSCrst7on9FjjFsLLISwM4LGSm9j
Lzwf46STLebvujCWTU+hUS8GG4Hb0HFce1zWvhjbRDPnRuntJCt8ZGY5jBtEIBrU
a6wA/8JMcTVzQgoqOPQmGxm6jDMRtoGH0bfy9AngQ/LjyRlunWHHqcH5Gx3jfrx8
yKpqL+WPaYdrsY2+p3JGmKVoJ6Mcs6VEpbU5WooaDA0PcM7IJfuddoNnA8mY5OBY
KltQpOYveppuhv62iYq0Ma+zmwYrZLXfv4j571eYRuqXQ/9yTHit3jH+suj5CI6S
h3wb3LEQpyLXHSl/c8QoBMTPMW2/XyZKF9lplQ20mgzMwq+1Z6tLOiKGO1XJrkma
XXdmBi+ZBn/6xFtLGXXMESJRIRQ5qSZEgb5pNJSo8lu8VBd8zv6gAZiMWpFhQbP/
Gnh1nVsJBvoirjdvAp3K6vHpXpAvs3hkOQGuZ0yoEq+htwELUyarhoySvqHchHAJ
0FNYXM+ez856sLtor/XPnIfi2JUs5ZjOZKmsoj9ZtPQ1j7ehprolEbkZ8y2kD4zM
gp1LLPg3PhH3OsW45FcrV3N3qEKOXYEP/qmTAMPltXPd5ThZNTPGu+gtLdRMXV0R
E4rfKQGcu+0=
=CKdn
-----END PGP SIGNATURE-----