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CVE-2023-46835

x86/AMD: mismatch in IOMMU quarantine page table levels

Published: Jan 5, 2024Updated: Nov 4, 2025 Sources: CVE List NVD BDUNVD-CWE-noinfo
5.5MEDIUM
NVD MITRE
EPSS Score
0.3%
Top 79.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

The current setup of the quarantine page tables assumes that the quarantine domain (dom_io) has been initialized with an address width of DEFAULT_DOMAIN_ADDRESS_WIDTH (48) and hence 4 page table levels. However dom_io being a PV domain gets the AMD-Vi IOMMU page tables levels based on the maximum (hot pluggable) RAM address, and hence on systems with no RAM above the 512GB mark only 3 page-table levels are configured in the IOMMU. On systems without RAM above the 512GB boundary amd_iommu_quarantine_init() will setup page tables for the scratch page with 4 levels, while the IOMMU will be configured to use 3 levels only, resulting in the last page table directory (PDE) effectively becoming a page table entry (PTE), and hence a device in quarantine mode gaining write access to the page destined to be a PDE. Due to this page table level mismatch, the sink page the device gets read/write access to is no longer cleared between device assignment, possibly leading to data leaks.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:LAC:LPR:LUI:NS:UC:HI:NA:N
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

NVD-CWE-noinfoCWE-787

Affected Products

The Linux Foundation
oss-project·USaka linux foundation, linuxfoundation.org
XenOn-prem
Cloud & SaaS / virtualization
Citrix Systems Inc.
commercial·USaka citrix gateway, netscaler gateway, citrix adc
Citrix HypervisorOn-prem
Cloud & SaaS
АО «НППКТ»
commercial·RU
ОСОН ОСнова ОnyxOn-premOS
Operating Systems / linux-distro
Xen
oss-project·GBaka qemu, xapi
XenOn-prem
Cloud & SaaS / virtualization
and 1 more affected products View all →

Exploitability

Official Patch Available
Workaround Available
Is your org exposed to CVE-2023-46835?We can run the check for you — a free external exposure review, no install. Check my exposure

Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://support.citrix.com/article/CTX583037/citrix-hypervisor-security-bulletin-for-cve202323583-and-cve202346835
support.citrix.com
https://www.cybersecurity-help.cz/vdb/SB2023112028
cybersecurity-help.cz
https://vuldb.com/?id.245157
vuldb.com
and 4 more references View all →

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