CVE-2022-33745

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.

8.8

CVSS

Severity: High

CVSS 3.1 •

EPSS 0.04%

Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org Vendor Advisory debian.org Vendor Advisory xen.org Vendor Advisory xenproject.org

Affected: Xen xen

References

Link	Tags
https://xenbits.xenproject.org/xsa/advisory-408.txt	vendor advisory
http://xenbits.xen.org/xsa/advisory-408.html	patch vendor advisory
http://www.openwall.com/lists/oss-security/2022/07/26/2	mailing list third party advisory patch
http://www.openwall.com/lists/oss-security/2022/07/26/3	mailing list third party advisory patch
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HUFIMNGYP5VQAA6KE3T2I5GW6UP6F7BS/	vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MYI3OMJ7RIZNL3C6GUWNANNPEUUID6FM/	vendor advisory
https://www.debian.org/security/2022/dsa-5272	third party advisory vendor advisory

Frequently Asked Questions

What is the severity of CVE-2022-33745?: CVE-2022-33745 has been scored as a high severity vulnerability.
How to fix CVE-2022-33745?: To fix CVE-2022-33745, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2022-33745 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2022-33745 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2022-33745?: CVE-2022-33745 affects Xen xen.

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