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CVE-2022-33745

8.8 · HIGH

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.

Published Jul 26, 2022EPSS 0.30%

Overview

CVE-2022-33745 is a high-severity vulnerability. It was published on July 26, 2022 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refwww.openwall.com/lists/oss-security/2022/07/26/2Refwww.openwall.com/lists/oss-security/2022/07/26/3Refxenbits.xen.org/xsa/advisory-408.htmlReflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HUFIMNGYP5VQAA6KE3T2I5GW6UP6F7BS/Reflists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MYI3OMJ7RIZNL3C6GUWNANNPEUUID6FM/Refwww.debian.org/security/2022/dsa-5272Refxenbits.xenproject.org/xsa/advisory-408.txtRefwww.openwall.com/lists/oss-security/2022/07/26/2Refwww.openwall.com/lists/oss-security/2022/07/26/3Refxenbits.xen.org/xsa/advisory-408.html

How CyberStrike helps

Frequently asked questions

What is CVE-2022-33745?

CVE-2022-33745 is a high-severity vulnerability. It was published on July 26, 2022 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2022-33745?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2022-33745?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2022-33745?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2022-33745 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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