CVE-2022-33745
First published: Tue Jul 26 2022(Updated: )
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.
Credit: security@xen.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Xen Xen | ||
| Debian Debian Linux | =11.0 | |
| Fedoraproject Fedora | =35 | |
| Fedoraproject Fedora | =36 | |
| debian/xen | <=4.11.4+107-gef32c7afa2-1 | 4.14.6-1 4.14.5+94-ge49571868d-1 4.17.1+2-gb773c48e36-1 4.17.2+55-g0b56bed864-1 |
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Reference Links
- http://www.openwall.com/lists/oss-security/2022/07/26/2
- http://www.openwall.com/lists/oss-security/2022/07/26/3
- http://xenbits.xen.org/xsa/advisory-408.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HUFIMNGYP5VQAA6KE3T2I5GW6UP6F7BS/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MYI3OMJ7RIZNL3C6GUWNANNPEUUID6FM/
- https://www.debian.org/security/2022/dsa-5272
- https://xenbits.xenproject.org/xsa/advisory-408.txt
- https://xenbits.xen.org/xsa/advisory-408.html
- https://security-tracker.debian.org/tracker/CVE-2022-33745
- 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/
Frequently Asked Questions
What is CVE-2022-33745?
CVE-2022-33745 is a vulnerability that allows insufficient TLB flush for x86 PV guests in shadow mode.
How does CVE-2022-33745 affect Xen?
CVE-2022-33745 affects Xen, specifically x86 PV guests in shadow paging mode.
What is the severity of CVE-2022-33745?
The severity of CVE-2022-33745 is high with a CVSS score of 8.8.
How can I fix CVE-2022-33745 on Debian Linux?
To fix CVE-2022-33745 on Debian Linux, update the Xen package to version 4.14.6-1 or later.
How can I fix CVE-2022-33745 on Fedora?
To fix CVE-2022-33745 on Fedora, update the Xen package to version 4.17.2+55-g0b56bed864-1 or later.
- collector/nvd-index
- collector/security-tracker-debian
- agent/severity
- agent/references
- agent/author
- agent/type
- agent/event
- agent/description
- agent/remedy
- agent/last-modified-date
- agent/softwarecombine
- agent/first-publish-date
- agent/tags
- collector/mitre-cve
- source/MITRE
- vendor/xen
- canonical/xen xen
- vendor/debian
- canonical/debian debian linux
- version/debian debian linux/11.0
- vendor/fedoraproject
- canonical/fedoraproject fedora
- version/fedoraproject fedora/35
- version/fedoraproject fedora/36
- package-manager/debian