CVE-2022-33745

Name: CVE-2022-33745
Creator: NVD / NIST
Published: 2022-07-26T13:15:10.003+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.29%

Last modified Jun 17, 2026

CVE-2022-33745 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. insufficient TLB flush for x86 PV guests in shadow mode For migration as well as to work around kernels unaware of L1TF (see XSA-273), PV guests may be run in shadow paging mode. To address XSA-401, code was moved inside a function in Xen. EPSS estimates a 0.29% chance of exploitation in the next 30 days.

Description

insufficient TLB flush for x86 PV guests in shadow mode For migration as well as to work around kernels unaware of L1TF (see XSA-273), PV guests may be run in shadow paging mode. To address XSA-401, code was moved inside a function in Xen. This code movement missed a variable changing meaning / value between old and new code positions. The now wrong use of the variable did lead to a wrong TLB flush condition, omitting flushes where such are necessary.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

0.29%

20.3th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Xen	Xen	All versions
Debian	Debian Linux	11.0
Fedoraproject	Fedora	35
Fedoraproject	Fedora	36

References

http://www.openwall.com/lists/oss-security/2022/07/26/2Mailing List, Patch, Third Party Advisory
http://www.openwall.com/lists/oss-security/2022/07/26/3Mailing List, Patch, Third Party Advisory
http://xenbits.xen.org/xsa/advisory-408.htmlPatch, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HUFIMNGYP5VQAA6KE3T2I5GW6UP6F7BS/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MYI3OMJ7RIZNL3C6GUWNANNPEUUID6FM/
https://www.debian.org/security/2022/dsa-5272Third Party Advisory
https://xenbits.xenproject.org/xsa/advisory-408.txtVendor Advisory
http://www.openwall.com/lists/oss-security/2022/07/26/2Mailing List, Patch, Third Party Advisory
http://www.openwall.com/lists/oss-security/2022/07/26/3Mailing List, Patch, Third Party Advisory
http://xenbits.xen.org/xsa/advisory-408.htmlPatch, Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HUFIMNGYP5VQAA6KE3T2I5GW6UP6F7BS/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MYI3OMJ7RIZNL3C6GUWNANNPEUUID6FM/
https://www.debian.org/security/2022/dsa-5272Third Party Advisory
https://xenbits.xenproject.org/xsa/advisory-408.txtVendor Advisory

Timeline

Published: Jul 26, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-33745?

How severe is CVE-2022-33745?

CVE-2022-33745 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.29% probability of exploitation in the next 30 days.

How do I fix CVE-2022-33745?

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-2022-33745?

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

Scan your code now

Source: NVD / NIST