CVE-2022-42327

Name: CVE-2022-42327
Creator: NVD / NIST
Published: 2022-11-01T13:15:12.163+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.1/10EPSS 0.23%

Last modified Jun 17, 2026

CVE-2022-42327 is a high-severity vulnerability rated 7.1/10 on the CVSS scale. x86: unintended memory sharing between guests On Intel systems that support the "virtualize APIC accesses" feature, a guest can read and write the global shared xAPIC page by moving the local APIC out of xAPIC mode. Access to this shared page bypasses the expected isolation that should exist between two guests.. EPSS estimates a 0.23% chance of exploitation in the next 30 days.

Description

x86: unintended memory sharing between guests On Intel systems that support the "virtualize APIC accesses" feature, a guest can read and write the global shared xAPIC page by moving the local APIC out of xAPIC mode. Access to this shared page bypasses the expected isolation that should exist between two guests.

Metrics

CVSS 3.1

7.1/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

EPSS Probability

0.23%

13.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-284

Affected Software

Vendor	Product	Versions
Xen	Xen	4.16
Fedoraproject	Fedora	36
Fedoraproject	Fedora	37

References

http://www.openwall.com/lists/oss-security/2022/11/01/3Mailing List, Patch, Third Party Advisory
http://xenbits.xen.org/xsa/advisory-412.htmlPatch, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YTMITQBGC23MSDHUCAPCVGLMVXIBXQTQ/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZLI2NPNEH7CNJO3VZGQNOI4M4EWLNKPZ/
https://security.gentoo.org/glsa/202402-07
https://xenbits.xenproject.org/xsa/advisory-412.txtVendor Advisory
http://www.openwall.com/lists/oss-security/2022/11/01/3Mailing List, Patch, Third Party Advisory
http://xenbits.xen.org/xsa/advisory-412.htmlPatch, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YTMITQBGC23MSDHUCAPCVGLMVXIBXQTQ/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZLI2NPNEH7CNJO3VZGQNOI4M4EWLNKPZ/
https://security.gentoo.org/glsa/202402-07
https://xenbits.xenproject.org/xsa/advisory-412.txtVendor Advisory

Timeline

Published: Nov 1, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-42327?

How severe is CVE-2022-42327?

CVE-2022-42327 has a CVSS score of 7.1/10 (HIGH severity). The EPSS model estimates a 0.23% probability of exploitation in the next 30 days.

How do I fix CVE-2022-42327?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-42327?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST