CVE-2022-42331

Name: CVE-2022-42331
Creator: NVD / NIST
Published: 2023-03-21T13:15:11.833+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.27%

Last modified Jun 17, 2026

CVE-2022-42331 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. x86: speculative vulnerability in 32bit SYSCALL path Due to an oversight in the very original Spectre/Meltdown security work (XSA-254), one entrypath performs its speculation-safety actions too late. In some configurations, there is an unprotected RET instruction which can be attacked with a variety of speculative attacks.. EPSS estimates a 0.27% chance of exploitation in the next 30 days.

Description

x86: speculative vulnerability in 32bit SYSCALL path Due to an oversight in the very original Spectre/Meltdown security work (XSA-254), one entrypath performs its speculation-safety actions too late. In some configurations, there is an unprotected RET instruction which can be attacked with a variety of speculative attacks.

Metrics

CVSS 3.1

5.5/10

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

EPSS Probability

0.27%

19.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Xen	Xen	>= 4.5.0, <= 4.17.0
Fedoraproject	Fedora	37
Fedoraproject	Fedora	38

References

http://www.openwall.com/lists/oss-security/2023/03/21/3Mailing List, Third Party Advisory
http://xenbits.xen.org/xsa/advisory-429.htmlVendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5L6PM4RE7MUE6OWA32ZVOXCP235RM2TM/Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APBMS2Q6746AXAFAITNJMGBNFGNMVLWR/Mailing List, Third Party Advisory
https://security.gentoo.org/glsa/202402-07
https://www.debian.org/security/2023/dsa-5378Third Party Advisory
https://xenbits.xenproject.org/xsa/advisory-429.txtVendor Advisory
http://www.openwall.com/lists/oss-security/2023/03/21/3Mailing List, Third Party Advisory
http://xenbits.xen.org/xsa/advisory-429.htmlVendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5L6PM4RE7MUE6OWA32ZVOXCP235RM2TM/Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APBMS2Q6746AXAFAITNJMGBNFGNMVLWR/Mailing List, Third Party Advisory
https://security.gentoo.org/glsa/202402-07
https://www.debian.org/security/2023/dsa-5378Third Party Advisory
https://xenbits.xenproject.org/xsa/advisory-429.txtVendor Advisory

Timeline

Published: Mar 21, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-42331?

How severe is CVE-2022-42331?

CVE-2022-42331 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.27% probability of exploitation in the next 30 days.

How do I fix CVE-2022-42331?

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-2022-42331?

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

Scan your code now

Source: NVD / NIST