CVE-2026-42493

highpriority · track · 0EPSS 0.004 · 39 %ileDEEU

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.45% (39th) EPSS

CVSS 7.5 · high

Is it mine?

12 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · cert_bund

EPSS · scored 2026-10-27

Addressing certain issues, in particular related to operations which may take excessively long and therefore would need preemption, has turned out overly costly. Since alternatives (HVM/PVH: HAP, PV: shim) are commonly available, the decision was to deprecate the functionality, while still retaining it for people to use at their own (security) risk. Memory-wise small enough guests may still be okay to run.

cvss

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

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.9–7.5

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · ENISA EU

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondaryexploitability 3.9 · impact 3.6

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

ssvc

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

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-400US

affected products (12)

Products and version ranges known to be affected.

Citrix Systems XenServer 8.4all versionscert_bundDEcpe:/a:citrix:xenserver:8.4
Citrix Systems XenServer 9all versionscert_bundDEcpe:/a:citrix:xenserver:9
Debian Linuxall versionscert_bundDEcpe:/o:debian:debian_linux:-
Fedora Linuxall versionscert_bundDEcpe:/o:fedoraproject:fedora:-
Open Source Xen 4.17.xall versionscert_bundDEcpe:/o:xen:xen:4.17.x
Open Source Xen 4.18.xall versionscert_bundDEcpe:/o:xen:xen:4.18.x
Open Source Xen 4.19.xall versionscert_bundDEcpe:/o:xen:xen:4.19.x
Open Source Xen 4.20.xall versionscert_bundDEcpe:/o:xen:xen:4.20.x
Open Source Xen 4.21.xall versionscert_bundDEcpe:/o:xen:xen:4.21.x
Open Source Xen 4.22.xall versionscert_bundDEcpe:/o:xen:xen:4.22.x
SUSE Linuxall versionscert_bundDEcpe:/o:suse:suse_linux:-
SUSE openSUSEall versionscert_bundDEcpe:/o:suse:opensuse:-

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-2568Xen: Mehrere SchwachstellenDeutsch2026-07-28csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Xen ausnutzen, um seine Privilegien zu erhöhen, vertrauliche Informationen offenzulegen oder einen Denial-of-Service-Zustand auszulösen.

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 2026-07-28modified 2026-07-28

references (6)

External citations — patches, advisories, analysis.

scry

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