Exploit/Advisories

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Ubuntu Security Notice USN-6056-1
May 05, 2023

linux-oem-6.1 vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 22.04 LTS

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).

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

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

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