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Fencer Vulns
critical 9.8

CVE-2025-27466 json

Mutiple vulnerabilities in the Viridian interface

published 2025-09-11 13 mo ago modified 2026-10-19 20 d ago also EUVD-2025-28913

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 42%
public exploits
0
none known

Summary

[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.]

There are multiple issues related to the handling and accessing of guest memory pages in the viridian code:

1. A NULL pointer dereference in the updating of the reference TSC area. This is CVE-2025-27466.

2. A NULL pointer dereference by assuming the SIM page is mapped when a synthetic timer message has to be delivered. This is CVE-2025-58142.

3. A race in the mapping of the reference TSC page, where a guest can get Xen to free a page while still present in the guest physical to machine (p2m) page tables. This is CVE-2025-58143.

Patch / fix

  • xen xen 4.17.0
  • xen Debian 12 4.17.5+72-g01140da4e8-1
  • xen Debian 13 4.20.2+7-g1badcf5035-0+deb13u1
  • xen Debian 14 4.20.2+7-g1badcf5035-1

debian advisories DEBIAN-CVE-2025-27466

  • xen SLE Micro 5.2 4.14.6_28-150300.3.94.1
  • xen SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Server Applications 15 SP6 +2 more 4.18.5_08-150600.3.34.2
  • xen SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Micro 5.4 +5 more 4.16.7_04-150400.4.75.1
  • xen SLE Module for Server Applications 15 SP6, SLE Module for Basesystem 15 SP6, openSUSE Leap 15.6 4.18.5_06-150600.3.31.2
  • xen SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Micro 5.5 +2 more 4.17.5_12-150500.3.53.1
  • xen SLE Module for Server Applications 15 SP7, SLE Module for Basesystem 15 SP7 4.20.1_04-150700.3.11.1

suse advisories SUSE-SU-2026:0303-1SUSE-SU-2026:0012-1SUSE-SU-2025:3843-1SUSE-SU-2025:3798-1SUSE-SU-2025:3797-1SUSE-SU-2025:03172-1

  • xen openSUSE Tumbleweed 4.20.1_04-1.1

opensuse advisories openSUSE-SU-2025:15547-1

  • xen Alpine 3.20, Alpine 3.19 4.18.5-r2
  • xen Alpine 3.21 4.19.3-r1
  • xen Alpine 3.24, Alpine 3.23, Alpine 3.22 4.20.1-r1

alpine advisories ALPINE-CVE-2025-27466

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-2025-27466 updated cvss 7.1

xen: viridian: A NULL pointer dereference in the updating of the reference TSC area

  • 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

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
13 mo ago

Exploit prediction

0.49% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Xen Xen

Classification

Weakness
  • CWE-395 Use of NullPointerException Catch to Detect NULL Pointer Dereference

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.