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Ubuntu 22.04 LTS: USN-6056-1 Critical: Linux Kernel Guest Exploit

ubuntu
Calendar Grey May 5, 2023
Dist Ubuntu Esm H88
Ubuntu 22.04 LTS faces a kernel vulnerability that might lead to possible crashes in guest virtual machines as well as risks of exposing sensitive information.
The guest VM system could be made to crash or expose sensitive information.

Summary

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

Software Description:

- 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).

Topics%20covered

Topics Covered

security advisory denial of service critical severity ubuntu sensitive information linux kernel guest system

Update Instructions

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

Ubuntu 22.04 LTS:
   linux-image-6.1.0-1010-oem      6.1.0-1010.10
   linux-image-oem-22.04c          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

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

CVE-2023-1859

Severity
critical
Lowest
Low
Medium
High
Critical

May 05, 2023

Topics%20covered

Topics Covered

security advisory denial of service critical severity ubuntu sensitive information linux kernel guest system

Package Information

https://launchpad.net/ubuntu/+source/linux-oem-6.1/6.1.0-1010.10

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