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Fencer Vulns
high 8.8

CVE-2022-33745 json

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 g…

published 2022-07-26 4 y ago modified 2026-06-17 4 mo ago also EUVD-2022-36784

cvss
8.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 22%
public exploits
0
none known

Summary

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.

Patch / fix

  • xen Debian 14, Debian 13, Debian 12 4.16.2-1

debian advisories DEBIAN-CVE-2022-33745

  • xen SLE Module for Server Applications 15 SP3, SLE Module for Basesystem 15 SP3, SLE Micro 5.2 +3 more 4.14.5_06-150300.3.35.1
  • xen SLES for SAP 15, SLE High Performance Computing 15-LTSS, SLE High Performance Computing 15-ESPOS 4.10.4_36-150000.3.77.1
  • xen SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLES 15 SP1-BCL +3 more 4.12.4_26-150100.3.75.1
  • xen SLE Module for Server Applications 15 SP3, SLE Module for Basesystem 15 SP3, SLE Micro 5.2 +3 more 4.14.5_04-150300.3.32.1
  • xen SLE Module for Server Applications 15 SP4, SLE Module for Basesystem 15 SP4, openSUSE Leap 15.4 4.16.1_06-150400.4.8.1
  • xen SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLES 15 SP2-BCL +6 more 4.13.4_12-150200.3.58.1
  • xen SLES 12 SP3-BCL 4.9.4_30-3.106.1
  • xen SLES 12 SP2-BCL 4.7.6_24-43.91.1

suse advisories SUSE-SU-2022:3665-1SUSE-SU-2022:2601-1SUSE-SU-2022:2600-1SUSE-SU-2022:2599-2SUSE-SU-2022:2599-1SUSE-SU-2022:2597-1

  • xen openSUSE Tumbleweed 4.16.1_02-3.1

opensuse advisories openSUSE-SU-2024:12219-1

  • xen Alpine 3.13 4.14.5-r5
  • xen Alpine 3.15, Alpine 3.14 4.15.3-r2
  • xen Alpine 3.24, Alpine 3.23, Alpine 3.22 +5 more 4.16.1-r6

alpine advisories ALPINE-CVE-2022-33745

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2022-33745 updated

xen: insufficient TLB flush for x86 PV guests in shadow mode

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.30% chance of exploitation in the next 30 days, higher than 22% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 8.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

  • Xen xen

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.