CVE-2026-23553

lowPriorität · verfolgen · 0EPSS 0.001 · 4. PerzentilDEEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.14% (4th) EPSS

CVSS 2.9 · low

Is it mine?

7 products

Prüfe deine Angriffsfläche

Who says so?

5 sources

cnnvd · enisa_euvd · cert_bund · nvd

EPSS · bewertet 2026-10-27

In the context switch logic Xen attempts to skip an IBPB in the case of a vCPU returning to a CPU on which it was the previous vCPU to run. While safe for Xen's isolation between vCPUs, this prevents the guest kernel correctly isolating between tasks. Consider: 1) vCPU runs on CPU A, running task 1. 2) vCPU moves to CPU B, idle gets scheduled on A. Xen skips IBPB. 3) On CPU B, guest kernel switches from task 1 to 2, issuing IBPB. 4) vCPU moves back to CPU A. Xen skips IBPB again. Now, task 2 is running on CPU A with task 1's training still in the BTB.

Behebungen

Hersteller-Fix, Mitigation oder Workaround, wie von den Quellen veröffentlicht.

Ein Hersteller-Fix ist verfügbar.

Behobenxen-libs-0:4.14.6_28-150300.3.94.1.x86_64 as component of SUSE Linux Enterprise Micro 5.2suse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-libs-0:4.17.6_04-150500.3.59.1.x86_64 as component of SUSE Linux Enterprise Micro 5.5suse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-0:4.18.5_10-150600.3.37.1.aarch64 as component of openSUSE Leap 15.6suse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-0:4.18.5_10-150600.3.37.1.x86_64 as component of openSUSE Leap 15.6suse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-devel-0:4.18.5_10-150600.3.37.1.aarch64 as component of openSUSE Leap 15.6suse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-devel-0:4.18.5_10-150600.3.37.1.x86_64 as component of openSUSE Leap 15.6suse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-doc-html-0:4.18.5_10-150600.3.37.1.aarch64 as component of openSUSE Leap 15.6suse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-doc-html-0:4.18.5_10-150600.3.37.1.x86_64 as component of openSUSE Leap 15.6suse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-libs-0:4.18.5_10-150600.3.37.1.aarch64 as component of openSUSE Leap 15.6suse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-libs-0:4.18.5_10-150600.3.37.1.x86_64 as component of openSUSE Leap 15.6suse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-libs-32bit-0:4.18.5_10-150600.3.37.1.x86_64 as component of openSUSE Leap 15.6suse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-tools-0:4.18.5_10-150600.3.37.1.aarch64 as component of openSUSE Leap 15.6suse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-tools-0:4.18.5_10-150600.3.37.1.x86_64 as component of openSUSE Leap 15.6suse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-tools-domU-0:4.18.5_10-150600.3.37.1.aarch64 as component of openSUSE Leap 15.6suse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-tools-domU-0:4.18.5_10-150600.3.37.1.x86_64 as component of openSUSE Leap 15.6suse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-tools-xendomains-wait-disk-0:4.18.5_10-150600.3.37.1.noarch as component of openSUSE Leap 15.6suse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-0:4.12.4_64-3.137.1.x86_64 as component of SUSE Linux Enterprise Server LTSS Extended Security 12 SP5suse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-devel-0:4.12.4_64-3.137.1.x86_64 as component of SUSE Linux Enterprise Server LTSS Extended Security 12 SP5suse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-doc-html-0:4.12.4_64-3.137.1.x86_64 as component of SUSE Linux Enterprise Server LTSS Extended Security 12 SP5suse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-libs-0:4.12.4_64-3.137.1.x86_64 as component of SUSE Linux Enterprise Server LTSS Extended Security 12 SP5suse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-libs-32bit-0:4.12.4_64-3.137.1.x86_64 as component of SUSE Linux Enterprise Server LTSS Extended Security 12 SP5suse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-tools-0:4.12.4_64-3.137.1.x86_64 as component of SUSE Linux Enterprise Server LTSS Extended Security 12 SP5suse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-tools-domU-0:4.12.4_64-3.137.1.x86_64 as component of SUSE Linux Enterprise Server LTSS Extended Security 12 SP5suse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-0:4.20.2_04-150700.3.22.1.x86_64 as component of SUSE Linux Enterprise Module for Server Applications 15 SP7suse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-devel-0:4.20.2_04-150700.3.22.1.x86_64 as component of SUSE Linux Enterprise Module for Server Applications 15 SP7suse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-libs-0:4.20.2_04-150700.3.22.1.x86_64 as component of SUSE Linux Enterprise Module for Basesystem 15 SP7suse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-tools-0:4.20.2_04-150700.3.22.1.x86_64 as component of SUSE Linux Enterprise Module for Server Applications 15 SP7suse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-tools-domU-0:4.20.2_04-150700.3.22.1.x86_64 as component of SUSE Linux Enterprise Module for Basesystem 15 SP7suse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-tools-xendomains-wait-disk-0:4.20.2_04-150700.3.22.1.noarch as component of SUSE Linux Enterprise Module for Server Applications 15 SP7suse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-libs-0:4.16.7_06-150400.4.78.1.x86_64 as component of SUSE Linux Enterprise Micro 5.3suse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-libs-0:4.16.7_06-150400.4.78.1.x86_64 as component of SUSE Linux Enterprise Micro 5.4suse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-0:4.20.2_06-150700.3.25.1.x86_64 as component of SUSE Linux Enterprise Module for Server Applications 15 SP7suse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-devel-0:4.20.2_06-150700.3.25.1.x86_64 as component of SUSE Linux Enterprise Module for Server Applications 15 SP7suse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-libs-0:4.20.2_06-150700.3.25.1.x86_64 as component of SUSE Linux Enterprise Module for Basesystem 15 SP7suse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-tools-0:4.20.2_06-150700.3.25.1.x86_64 as component of SUSE Linux Enterprise Module for Server Applications 15 SP7suse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-tools-domU-0:4.20.2_06-150700.3.25.1.x86_64 as component of SUSE Linux Enterprise Module for Basesystem 15 SP7suse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-tools-xendomains-wait-disk-0:4.20.2_06-150700.3.25.1.noarch as component of SUSE Linux Enterprise Module for Server Applications 15 SP7suse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-0:4.21.0_04-1.1.aarch64 as component of openSUSE Tumbleweedsuse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-0:4.21.0_04-1.1.ppc64le as component of openSUSE Tumbleweedsuse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-0:4.21.0_04-1.1.s390x as component of openSUSE Tumbleweedsuse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-0:4.21.0_04-1.1.x86_64 as component of openSUSE Tumbleweedsuse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-devel-0:4.21.0_04-1.1.aarch64 as component of openSUSE Tumbleweedsuse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-devel-0:4.21.0_04-1.1.ppc64le as component of openSUSE Tumbleweedsuse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-devel-0:4.21.0_04-1.1.s390x as component of openSUSE Tumbleweedsuse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-devel-0:4.21.0_04-1.1.x86_64 as component of openSUSE Tumbleweedsuse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-doc-html-0:4.21.0_04-1.1.aarch64 as component of openSUSE Tumbleweedsuse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-doc-html-0:4.21.0_04-1.1.ppc64le as component of openSUSE Tumbleweedsuse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-doc-html-0:4.21.0_04-1.1.s390x as component of openSUSE Tumbleweedsuse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-doc-html-0:4.21.0_04-1.1.x86_64 as component of openSUSE Tumbleweedsuse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-libs-0:4.21.0_04-1.1.aarch64 as component of openSUSE Tumbleweedsuse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-libs-0:4.21.0_04-1.1.ppc64le as component of openSUSE Tumbleweedsuse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-libs-0:4.21.0_04-1.1.s390x as component of openSUSE Tumbleweedsuse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-libs-0:4.21.0_04-1.1.x86_64 as component of openSUSE Tumbleweedsuse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-tools-0:4.21.0_04-1.1.aarch64 as component of openSUSE Tumbleweedsuse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-tools-0:4.21.0_04-1.1.ppc64le as component of openSUSE Tumbleweedsuse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-tools-0:4.21.0_04-1.1.s390x as component of openSUSE Tumbleweedsuse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-tools-0:4.21.0_04-1.1.x86_64 as component of openSUSE Tumbleweedsuse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-tools-domU-0:4.21.0_04-1.1.aarch64 as component of openSUSE Tumbleweedsuse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-tools-domU-0:4.21.0_04-1.1.ppc64le as component of openSUSE Tumbleweedsuse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-tools-domU-0:4.21.0_04-1.1.s390x as component of openSUSE Tumbleweedsuse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-tools-domU-0:4.21.0_04-1.1.x86_64 as component of openSUSE Tumbleweedsuse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-tools-xendomains-wait-disk-0:4.21.0_04-1.1.aarch64 as component of openSUSE Tumbleweedsuse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-tools-xendomains-wait-disk-0:4.21.0_04-1.1.ppc64le as component of openSUSE Tumbleweedsuse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-tools-xendomains-wait-disk-0:4.21.0_04-1.1.s390x as component of openSUSE Tumbleweedsuse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Behobenxen-tools-xendomains-wait-disk-0:4.21.0_04-1.1.x86_64 as component of openSUSE Tumbleweedsuse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

cvss

Technischer Schweregrad, 0–10. Eine Zeile je Quelle.

5.5

010

Basiswert 0–10 · höher = schwerwiegender · Vektor überfahren zum Auflösen⚠ Quellen uneinig · low–medium · 2.7–5.5

v3.12.9lowCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:Nsecondary · ENISA EU

v3.12.9lowCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:NsecondaryAusnutzbarkeit 1.4 · Auswirkung 1.4

v3.12.7lowCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

v3.15.5mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:Nsecondary · SUSE Product Security

SSVC

Eine Handlungsentscheidung — aus Ausnutzung und Auswirkung.

Trackcoordinatorcisa_ssvcUS

schwächen

Die CWE-Schwächeklassen, zu denen dies gehört.

CWE-665USCWE-693US

betroffene Produkte (7)

Betroffene Produkte und Versionsbereiche.

Citrix Systems XenServer 8.4alle Versionencert_bundDEcpe:/a:citrix:xenserver:8.4
Debian Linuxalle Versionencert_bundDEcpe:/o:debian:debian_linux:-
Fedora Linuxalle Versionencert_bundDEcpe:/o:fedoraproject:fedora:-
SUSE Linuxalle Versionencert_bundDEcpe:/o:suse:suse_linux:-
SUSE openSUSEalle Versionencert_bundDEcpe:/o:suse:opensuse:-
Open Source Xen< 4.18.xcert_bundDE
xen xen≥ 4.6.0nvdUScpe:2.3:o:xen:xen:*:*:*:*:*:*:*:*

Advisories (9)

Hersteller- und Ökosystem-Meldungen dazu.

SUSE-SU-2026:0303-1Security update for xen2026-01-27csaf · suse_csafDE
Security update for xen
SUSE-SU-2026:0304-1Security update for xen2026-01-27csaf · suse_csafDE
Security update for xen
SUSE-SU-2026:0306-1Security update for xen2026-01-27csaf · suse_csafDE
Security update for xen
SUSE-SU-2026:0328-1Security update for xen2026-01-28csaf · suse_csafDE
Security update for xen
SUSE-SU-2026:0329-1Security update for xen2026-01-28csaf · suse_csafDE
Security update for xen
SUSE-SU-2026:0394-1Security update for xen2026-02-05csaf · suse_csafDE
Security update for xen
SUSE-SU-2026:0589-1Security update for xen2026-02-20csaf · suse_csafDE
Security update for xen
WID-SEC-W-2026-0229Citrix Systems XenServer und Xen: Schwachstelle ermöglicht Offenlegung von InformationenDeutsch2026-01-27csaf · cert_bundDE
Ein lokaler Angreifer kann eine Schwachstelle in Citrix Systems XenServer und Xen ausnutzen, um Informationen offenzulegen.
openSUSE-SU-2026:10118-1xen-4.21.0_04-1.1 on GA media2026-01-29csaf · suse_csafDE
xen-4.21.0_04-1.1 on GA media

auch bekannt als (3)

Weitere Namen und Kennungen dieser Entität.

quellen

Welche Quellen diesen Datensatz belegen und wann.

cnnvd enisa_euvd cert_bund nvd suse_csaf NVD CVE.org MITRE

veröffentlicht 2026-01-28geändert 2026-06-17

Referenzen (10)

Externe Belege — Patches, Meldungen, Analysen.

scry

Angreifer nutzen Schwachstellen wie diese gegen im Internet exponierte Dienste aus. Sehen Sie mit einem kostenlosen Passiv-Scan, was exponiert ist.

Kostenloser Scan