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Fencer Vulns
high 8.8

CVE-2018-18883 json

An issue was discovered in Xen 4.9.x through 4.11.x, on Intel x86 platforms, allowing x86 HVM and PVH guests to cause a host OS denial of s…

published 2018-11-01 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-10594

cvss
8.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 39%
public exploits
0
none known

Summary

An issue was discovered in Xen 4.9.x through 4.11.x, on Intel x86 platforms, allowing x86 HVM and PVH guests to cause a host OS denial of service (NULL pointer dereference) or possibly have unspecified other impact because nested VT-x is not properly restricted.

Patch / fix

  • xen Debian 14, Debian 13, Debian 12 4.11.1-1

debian advisories DEBIAN-CVE-2018-18883

  • xen SLES for SAP 12 SP4, SLES 12 SP4, SLED 12 SP4 +1 more 4.11.1_02-2.3.1
  • xen SLE Module for Server Applications 15, SLE Module for Basesystem 15 4.10.2_04-3.9.1
  • xen SLES for SAP 12 SP3, SLES 12 SP3, SLED 12 SP3 +1 more 4.9.3_03-3.47.1

suse advisories SUSE-SU-2019:0003-1SUSE-SU-2018:4300-1SUSE-SU-2018:4070-1

  • xen openSUSE Tumbleweed 4.15.1_01-1.2

opensuse advisories openSUSE-SU-2024:11520-1

  • xen Alpine 3.24, Alpine 3.23, Alpine 3.22 +13 more 4.11.1-r0
  • xen Alpine 3.6 4.8.5-r0
  • xen Alpine 3.7 4.9.3-r1
  • xen Alpine 3.8 4.10.2-r1

alpine advisories ALPINE-CVE-2018-18883

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-2018-18883 updated cvss 4.5

xen: Nested VT-x usable even when disabled

  • Red Hat Enterprise Linux 5 xen
    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

0.45% chance of exploitation in the next 30 days, higher than 39% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 8.8 CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
NVD 2.0 7.2 AV:L/AC:L/Au:N/C:C/I:C/A:C

Classification

Weakness

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.