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Fencer Vulns
medium 5.5

CVE-2022-42331 json

x86: speculative vulnerability in 32bit SYSCALL path Due to an oversight in the very original Spectre/Meltdown security work (XSA-254), one…

published 2023-03-21 3 y ago modified 2026-06-17 4 mo ago also EUVD-2022-45406

cvss
5.5
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 20%
public exploits
0
none known

Summary

x86: speculative vulnerability in 32bit SYSCALL path Due to an oversight in the very original Spectre/Meltdown security work (XSA-254), one entrypath performs its speculation-safety actions too late. In some configurations, there is an unprotected RET instruction which can be attacked with a variety of speculative attacks.

Patch / fix

  • xen Debian 14, Debian 13, Debian 12 4.17.0+74-g3eac216e6e-1

debian advisories DEBIAN-CVE-2022-42331

  • xen SLE Module for Server Applications 15 SP4, SLE Module for Basesystem 15 SP4, SLE Micro 5.4 +3 more 4.16.3_06-150400.4.25.1
  • xen SLES for SAP 15 SP2, SLES 15 SP2-LTSS, SLE High Performance Computing 15 SP2-LTSS +1 more 4.13.4_20-150200.3.71.1
  • xen SLES for SAP 12 SP4, SLES 12 SP4-LTSS, SLES 12 SP4-ESPOS +2 more 4.11.4_38-2.89.1
  • xen SLES for SAP 15 SP3, SLES 15 SP3-LTSS, SLE Real Time 15 SP3 +7 more 4.14.5_12-150300.3.48.1
  • xen SLES 12 SP2-BCL 4.7.6_32-43.104.1
  • xen SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 4.12.4_34-3.88.1
  • xen SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLE High Performance Computing 15 SP1-LTSS 4.12.4_34-150100.3.86.1

suse advisories SUSE-SU-2023:0848-2SUSE-SU-2023:0862-1SUSE-SU-2023:0859-1SUSE-SU-2023:0858-1SUSE-SU-2023:0848-1SUSE-SU-2023:0847-1

  • xen openSUSE Tumbleweed 4.17.0_06-1.1

opensuse advisories openSUSE-SU-2024:12833-1

  • xen Alpine 3.15 4.15.5-r0
  • xen Alpine 3.17, Alpine 3.16 4.16.4-r0
  • xen Alpine 3.24, Alpine 3.23, Alpine 3.22 +4 more 4.17.0-r5

alpine advisories ALPINE-CVE-2022-42331

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-2022-42331 updated cvss 7.5

xen: Xen Security Advisory

  • 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

0.28% chance of exploitation in the next 30 days, higher than 20% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

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.