CVE-2022-42320

Guest cross-domain access via stale Xenstore permissions

Published Nov 1, 2022 · Updated Nov 20, 2024

Improper access control in Xen Xenstore allows guest OS users to access resources belonging to a deleted domain during domid reuse. Xenstored leaves node permissions tied to a removed domain ID, then temporarily treats those stale rights as valid when that ID is reassigned. Exploitation requires the C Xenstore implementation, a newly created guest, and another domain writing the node before dom0 introduces the new guest; consequences depend on stored resources and include disclosure, denial of service, or privilege escalation.

CVSS severity7.0
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Xen Xenstore allows guest OS users to access resources belonging to a deleted domain during domid reuse. Xenstored leaves node permissions tied to a removed domain ID, then temporarily treats those stale rights as valid when that ID is reassigned. Exploitation requires the C Xenstore implementation, a newly created guest, and another domain writing the node before dom0 introduces the new guest; consequences depend on stored resources and include disclosure, denial of service, or privilege escalation.

The record

CVE
CVE-2022-42320
Published
Nov 1, 2022
Updated
Nov 20, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-459, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 1, 2022CVE publishedPublication date reported by the CVE source.
  2. Nov 20, 2024Record 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

7.5SUSECVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
7.0NIST NVDCVSS:3.1/AV:L/AC:H/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-459Incomplete Cleanup
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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