CVE-2023-34322

Host compromise via premature shadow-root teardown

Published Jan 5, 2024 · Updated Nov 4, 2025

Improper shadow-page handling in Xen 3.2 and later allows guest OS users to compromise an x86 host from a 64-bit PV guest. When shadow-pool memory runs short, teardown can release the top-level shadow page table while a CPU is still executing through it because the live-table precaution ends too soon. Reachability requires shadow mode during migration or as the L1TF workaround; the vendor states that host-wide denial of service, information disclosure, and privilege escalation cannot be ruled out.

CVSS severity7.8
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper shadow-page handling in Xen 3.2 and later allows guest OS users to compromise an x86 host from a 64-bit PV guest. When shadow-pool memory runs short, teardown can release the top-level shadow page table while a CPU is still executing through it because the live-table precaution ends too soon. Reachability requires shadow mode during migration or as the L1TF workaround; the vendor states that host-wide denial of service, information disclosure, and privilege escalation cannot be ruled out.

The record

CVE
CVE-2023-34322
Published
Jan 5, 2024
Updated
Nov 4, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-273, 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

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-273Improper Check for Dropped Privileges
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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