CVE-2023-46836

mediumpriority · track · 19EPSS 0.003 · 16 %ileDEEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.25% (16th) EPSS

CVSS 4.7 · medium

Is it mine?

51 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

The fixes for XSA-422 (Branch Type Confusion) and XSA-434 (Speculative Return Stack Overflow) are not IRQ-safe. It was believed that the mitigations always operated in contexts with IRQs disabled. However, the original XSA-254 fix for Meltdown (XPTI) deliberately left interrupts enabled on two entry paths; one unconditionally, and one conditionally on whether XPTI was active. As BTC/SRSO and Meltdown affect different CPU vendors, the mitigations are not active together by default. Therefore, there is a race condition whereby a malicious PV guest can bypass BTC/SRSO protections and launch a BTC/SRSO attack against Xen.

cvss

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

5.1

010

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

v3.14.7mediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 1 · impact 3.6

v3.15.1mediumAV:L/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:Nsecondary · FSTEC (BDU) RU

v3.14.7mediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:Nsecondary · ENISA EU

v3.14.7mediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:Nsecondaryexploitability 1 · impact 3.6

v3.14.3mediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N/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-119US

affected products (51)

Products and version ranges known to be affected.

Citrix Systems Hypervisorall versionscert_bundDEcpe:/o:citrix:hypervisor:-
Citrix Systems XenServerall versionscert_bundDEcpe:/a:citrix:xenserver:-
Fedora Linuxall versionscert_bundDEcpe:/o:fedoraproject:fedora:-
Gentoo Linuxall versionscert_bundDEcpe:/o:gentoo:linux:-
Open Source Xen <4.15.xall versionscert_bundDE
SUSE Linuxall versionscert_bundDEcpe:/o:suse:suse_linux:-
Open Source Xen< 4.15.xcert_bundDE
Novell Inc. OpenSUSE Leap≤ 15.4fstec_bduRU
Novell Inc. OpenSUSE Leap≤ 15.5fstec_bduRU
Novell Inc. SUSE Enterprise Storage≤ 7.1fstec_bduRU
Novell Inc. SUSE Linux Enterprise≤ 12 SP5fstec_bduRU
Novell Inc. SUSE Linux Enterprise High Performance Computing≤ 15 SP5fstec_bduRU
Novell Inc. SUSE Linux Enterprise High Performance Computing≤ 15 SP3-LTSSfstec_bduRU
Novell Inc. SUSE Linux Enterprise High Performance Computing≤ 15 SP3-ESPOSfstec_bduRU
Novell Inc. SUSE Linux Enterprise High Performance Computing≤ 15 SP4fstec_bduRU
Novell Inc. SUSE Linux Enterprise Micro≤ 5.1fstec_bduRU
Novell Inc. SUSE Linux Enterprise Micro≤ 5.2fstec_bduRU
Novell Inc. SUSE Linux Enterprise Micro≤ 5.3fstec_bduRU
Novell Inc. SUSE Linux Enterprise Micro≤ 5.4fstec_bduRU
Novell Inc. SUSE Linux Enterprise Micro≤ 5.5fstec_bduRU

showing 20 of 51

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2023-2900Xen: Mehrere Schwachstellen ermöglichen Offenlegung von InformationenDeutsch2023-11-14csaf · cert_bundDE
Ein lokaler Angreifer kann mehrere Schwachstellen in Xen ausnutzen, um Informationen offenzulegen.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund NVD CVE.org MITRE

published 2024-01-05modified 2026-06-17

references (10)

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