CVE-2026-79609

highpriority · track · 0EPSS 0.001 · 1 %ileDEFR

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.11% (1st) EPSS

CVSS 8.8 · high

Is it mine?

9 products

Check your exposure

Who says so?

2 sources

cert_bund · certfr

EPSS · scored 2026-10-27

XPTI (Xen Page Table Isolation) was introduced to mitigate Meltdown (CVE-2017-5754, one aspect of XSA-254). This involves copying 64-bit PV guest page table entries from guest-chosen root page tables to the Xen- chosen one which is in actual use by hardware. To read the guest root page table, the directmap is used. PV guests, however, have a directmap which may not cover all memory; in particular this is the case if any memory extends beyond the 5 TiB (CONFIG_BIGMEM=y: 3.5 TiB) address boundary.

cvss

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

8.8

010

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

v3.18.8highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:Hsecondaryexploitability 2 · impact 6

v3.18.1highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

ssvc

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

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-284US

affected products (9)

Products and version ranges known to be affected.

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 4.21.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:-
Xenall versionscert_bundDEcpe:/o:xen:xen:tapdisk

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-3930Xen: Mehrere SchwachstellenDeutsch2026-10-13csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Xen ausnutzen, um beliebigen Code – möglicherweise sogar mit Root-Rechten – auszuführen, erweiterte Berechtigungen zu erlangen, Sicherheitsmaßnahmen zu umgehen, Daten zu manipulieren oder offenzulegen oder einen Denial-of-Service-Zustand auszulösen.
CERTFR-2026-AVI-1302Multiples vulnérabilités dans XenFrançais2026-10-14vendor · certfrFR

sources

Which sources assert this record, and when.

cert_bund certfr NVD CVE.org MITRE

published 2026-10-13modified 2026-10-20

references (2) nvd

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