CVE-2023-34326

Xen

Published

05 January 2024

Modified

04 November 2025

Patch / advisory

View advisory

CVSS Score v3.1 7.8

Click a component to see what it means

Raw vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Score 0.0029 21th percentile

Risk Priority 56 floored blend · peak EPSS

Summary

CVE-2023-34326 is a high-severity Operation on a Resource after Expiration or Release (CWE-672) vulnerability in Xen Xen. Its CVSS base score is 7.8 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked at the 21th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to AC-3 (Access Enforcement) and IA-5 (Authenticator Management) — see the control section below for these in your framework.

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2023-38407

Vulnerability Data

The caching invalidation guidelines from the AMD-Vi specification (48882—Rev 3.07-PUB—Oct 2022) is incorrect on some hardware, as devices will malfunction (see stale DMA mappings) if some fields of the DTE are updated but the IOMMU TLB is not flushed. Such…

stale DMA mappings can point to memory ranges not owned by the guest, thus allowing access to unindented memory regions.

CWE(s): NVD-CWE-noinfo CWE-672

Related Threats

MITRE ATT&CK Enterprise Techniques

T1068 Exploitation for Privilege Escalation Privilege Escalation

Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.

attack.mitre.org →

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

T1203 Exploitation for Client Execution Execution

Adversaries may exploit software vulnerabilities in client applications to execute code.

attack.mitre.org →

T1210 Exploitation of Remote Services Lateral Movement

Adversaries may exploit remote services to gain unauthorized access to internal systems once inside of a network.

attack.mitre.org →

Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2025-58149Same product: Xen Xen

CVE-2023-46837Same product: Xen Xen

CVE-2023-34321Same product: Xen Xen

CVE-2025-58147Same product: Xen Xen

CVE-2025-58150Same product: Xen Xen

CVE-2023-46835Same product: Xen Xen

CVE-2023-34325Same product: Xen Xen

CVE-2025-58148Same product: Xen Xen

CVE-2026-23558Same product: Xen Xen

CVE-2025-58145Same product: Xen Xen

Affected Assets

xen

all versions

Mitigating Controls

Control response

Prevent

Stop it (NIST 800-53)

—

Detect

Catch it (NIST detect / respond)

—

Harden

Shrink the surface (DISA STIG)

1 hardening rule · 1 OS baseline

Validate

Prove the fix (OWASP ASVS)

—

Mitigating Controls (NIST 800-53 r5) AI

AC-3 Access Enforcement good match

Access enforcement applies current authorizations to every request, directly blocking operations once a resource has been revoked or released.

IA-5 Authenticator Management good match

Authenticator management mandates revocation and replacement procedures that render expired credentials unusable.

AC-2 Account Management partial match

Account lifecycle management includes explicit revocation and disabling steps that stop subsequent operations on released accounts or identifiers.

IA-4 Identifier Management partial match

Identifier management requires deallocation and reuse controls that prevent continued use of released identifiers.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.AA-05 mostly match

prevents

Enforcing managed authorizations and revocations directly prevents post-release operations on credentials or entitlements.

PR.PS-06 mostly match

prevents

Secure development practices eliminate the root coding flaw that permits use-after-release.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match

finds

Security testing can detect use-after-release but does not prevent it at runtime.

A.8.10 Information deletion partial match

degrades

Enforces timely deletion of resources so they cannot be used after release.

A.8.28 Secure coding partial match

prevents

Secure-coding rules require checks that prevent operations on freed or expired objects.

A.8.32 Change management partial match

prevents

Change-management processes can introduce or remove resource-lifetime controls.