CVE-2022-33745
HIGHXen - Insufficient TLB Flush for x86 PV Guests in Shadow Mode
Title source: llmDescription
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.
References (7)
Core 7
Core References
Mailing List, Patch, Third Party Advisory mailing-list
http://www.openwall.com/lists/oss-security/2022/07/26/2
Mailing List, Patch, Third Party Advisory mailing-list
http://www.openwall.com/lists/oss-security/2022/07/26/3
Mailing List, Third Party Advisory vendor-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HUFIMNGYP5VQAA6KE3T2I5GW6UP6F7BS/
Mailing List, Third Party Advisory vendor-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MYI3OMJ7RIZNL3C6GUWNANNPEUUID6FM/
Third Party Advisory vendor-advisory
https://www.debian.org/security/2022/dsa-5272
Patch, Vendor Advisory
http://xenbits.xen.org/xsa/advisory-408.html
Vendor Advisory
https://xenbits.xenproject.org/xsa/advisory-408.txt
Scores
CVSS v3
8.8
EPSS
0.0008
EPSS Percentile
23.0%
Attack Vector
LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Details
Status
published
Products (4)
debian/debian_linux
11.0
fedoraproject/fedora
35
fedoraproject/fedora
36
xen/xen
Published
Jul 26, 2022
Tracked Since
Feb 18, 2026