CVE-2022-42334

Host denial of service via unserialized region updates

Published Mar 21, 2023 · Updated Feb 13, 2025

Race condition in Xen 4.11 through 4.17 allows local users controlling HVM guests to stall a physical CPU and interrupt the host. The pinned cache-attribute interface installs and removes controlled regions without proper serialization, allowing concurrent updates to race. Exploitation requires an x86 host and control of an HVM guest through a deprivileged Dom0 device model or stub domain; Arm, PV, and PVH configurations are unaffected.

CVSS severity6.5
Medium
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

Race condition in Xen 4.11 through 4.17 allows local users controlling HVM guests to stall a physical CPU and interrupt the host. The pinned cache-attribute interface installs and removes controlled regions without proper serialization, allowing concurrent updates to race. Exploitation requires an x86 host and control of an HVM guest through a deprivileged Dom0 device model or stub domain; Arm, PV, and PVH configurations are unaffected.

The record

CVE
CVE-2022-42334
Published
Mar 21, 2023
Updated
Feb 13, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-770, T1499.004
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

6.7SUSECVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:H
6.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/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-770Allocation of Resources Without Limits or Throttling
T1499.004Endpoint Denial of Service: Application 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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