CVE-2022-42332

Guest-to-host privilege escalation via shadow-page use-after-free

Published Mar 21, 2023 · Updated Feb 13, 2025

Use-after-free in Xen shadow paging in 3.2 and later allows guest OS users to crash the host or escalate privileges during migration. The shadow allocator reserves for page-table demand but omits log-dirty metadata demand, so a new shadow page table can be freed while other code still accesses it. Exposure is limited to x86 PV guests, or HVM and PVH guests using shadow paging, while migration or snapshotting enables log-dirty mode.

CVSS severity7.8
High
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Xen shadow paging in 3.2 and later allows guest OS users to crash the host or escalate privileges during migration. The shadow allocator reserves for page-table demand but omits log-dirty metadata demand, so a new shadow page table can be freed while other code still accesses it. Exposure is limited to x86 PV guests, or HVM and PVH guests using shadow paging, while migration or snapshotting enables log-dirty mode.

The record

CVE
CVE-2022-42332
Published
Mar 21, 2023
Updated
Feb 13, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-416, T1499, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 21, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 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

7.5SUSECVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
7.8NIST NVDCVSS: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-416Use After Free
T1499Endpoint Denial of Service
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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