CVE-2026-42487

highpriority · track · 0EPSS 0.001 · 1 %ileDEEU

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.10% (1st) EPSS

CVSS 7.9 · high

Is it mine?

7 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · cert_bund

EPSS · scored 2026-10-27

HVM guest I/O port accesses are subject to either emulation or at least translation. Translations are managed by the device model (via XEN_DOMCTL_ioport_mapping), and hence the linked list used may changed at any time. Traversal of those lists (while handling guest I/O port accesses) therefore needs synchronizing with updates, which was missing so far.

cvss

Technical severity, 0–10. One row per scoring source.

7.9

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.17.9highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:Hsecondary · ENISA EU

v3.17.9highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:Hsecondaryexploitability 2 · impact 5.3

v3.17.2highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-362US

affected products (7)

Products and version ranges known to be affected.

Debian Linuxall versionscert_bundDEcpe:/o:debian:debian_linux:-
Fedora Linuxall versionscert_bundDEcpe:/o:fedoraproject:fedora:-
Oracle Linuxall versionscert_bundDEcpe:/o:oracle:linux:-
SUSE Linuxall versionscert_bundDEcpe:/o:suse:suse_linux:-
Ubuntu Linuxall versionscert_bundDEcpe:/o:canonical:ubuntu_linux:-
Open Source Xen≥ 3.3cert_bundDE
Open Source Xen≥ 4.15cert_bundDE

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-1851Xen: Mehrere SchwachstellenDeutsch2026-06-09csaf · cert_bundDE
Ein lokaler Angreifer kann mehrere Schwachstellen in Xen ausnutzen, um erweiterte Privilegien zu erlangen, Daten zu manipulieren, vertrauliche Informationen offenzulegen oder einen Denial-of-Service-Zustand zu verursachen.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund NVD CVE.org MITRE

published 2026-06-18modified 2026-06-22

references (8)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan