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

CVE-2025-27466

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

[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.

CRITICAL · CVSS 9.8 EPSS 0.0004
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

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

Affected Products & Versions

1
xen>= 4.13.0 and < 4.17.0
▣

Scoring & Timeline

9.8
CRITICAL · CVSS v3.1 · security@xen.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD11 Sep 2025 · 02:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

7
suse-csafSUSE-SU-2026:0303-1
suse-csafSUSE-SU-2026:0012-1
suse-csafSUSE-SU-2025:3843-1
suse-csafSUSE-SU-2025:3797-1
suse-csafSUSE-SU-2025:3798-1
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://xenbits.xenproject.org/xsa/advisory-472.htmlVendor Advisory
http://www.openwall.com/lists/oss-security/2025/09/09/1
http://xenbits.xen.org/xsa/advisory-472.html
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