CVE-2023-34326

Guest-to-host compromise via stale DMA mappings

Published Jan 5, 2024 · Updated Nov 4, 2025

Improper IOMMU invalidation in Xen on x86 AMD systems allows guest OS users with a passed-through device to compromise the host. Xen updates selected device-table-entry fields without flushing the AMD IOMMU TLB, leaving stale DMA translations that can address memory outside the guest. Exploitation requires an x86 AMD host with IOMMU hardware and PCI passthrough; a guest can escalate privileges, disclose memory, or interrupt the entire host.

CVSS severity7.8
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper IOMMU invalidation in Xen on x86 AMD systems allows guest OS users with a passed-through device to compromise the host. Xen updates selected device-table-entry fields without flushing the AMD IOMMU TLB, leaving stale DMA translations that can address memory outside the guest. Exploitation requires an x86 AMD host with IOMMU hardware and PCI passthrough; a guest can escalate privileges, disclose memory, or interrupt the entire host.

The record

CVE
CVE-2023-34326
Published
Jan 5, 2024
Updated
Nov 4, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-672, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 5, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8CISA ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-672Operation on a Resource after Expiration or Release
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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