CVE-2022-42333

Host denial of service via unbounded regions

Published Mar 21, 2023 · Updated Feb 13, 2025

Resource exhaustion in Xen 4.11 through 4.17 allows attackers controlling HVM guests to cause host-wide denial of service via cache controls. The cacheability-control interface accepts an unbounded number of pinned cache-attribute regions, allowing host resources to be exhausted. Exposure is limited to x86 systems where a stub-domain or deprivileged Dom0 device model controls an HVM guest, and exploitation can stall or exhaust the entire host.

CVSS severity8.6
High
EPSS probability1.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Xen 4.11 through 4.17 allows attackers controlling HVM guests to cause host-wide denial of service via cache controls. The cacheability-control interface accepts an unbounded number of pinned cache-attribute regions, allowing host resources to be exhausted. Exposure is limited to x86 systems where a stub-domain or deprivileged Dom0 device model controls an HVM guest, and exploitation can stall or exhaust the entire host.

The record

CVE
CVE-2022-42333
Published
Mar 21, 2023
Updated
Feb 13, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-770, T1499.004
Attack vector
local
Privileges
Unavailable

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 privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.6NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/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.

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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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
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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