CVE-2022-42335

Guest-to-host crash via missing page validity check

Published Apr 25, 2023 · Updated Aug 3, 2024

Pointer dereference in Xen 4.17 allows guest OS users to crash the hypervisor through an HVM guest with PCI passthrough. The sh_unshadow_for_p2m_change() routine omits mfn_valid(), causing sh_remove_shadows() to process a guest frame without a backing page and dereference guest-influenced memory. Exploitation requires x86, shadow paging, and PCI passthrough; denial of service is confirmed, while privilege escalation remains unproven.

CVSS severity7.8
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Pointer dereference in Xen 4.17 allows guest OS users to crash the hypervisor through an HVM guest with PCI passthrough. The sh_unshadow_for_p2m_change() routine omits mfn_valid(), causing sh_remove_shadows() to process a guest frame without a backing page and dereference guest-influenced memory. Exploitation requires x86, shadow paging, and PCI passthrough; denial of service is confirmed, while privilege escalation remains unproven.

The record

CVE
CVE-2022-42335
Published
Apr 25, 2023
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 25, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.3SUSECVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:L/I:L/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-476NULL Pointer Dereference
T1499.004Application or System Exploitation

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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