CVE-2022-33747

Service interruption via unbounded P2M mapping allocations

Published Oct 11, 2022 · Updated Aug 3, 2024

Resource exhaustion in all Xen versions on Arm allows guest OS users to interrupt allocation-dependent operations through P2M changes. Removing pages backed by large second-stage mappings splits them into smaller mappings and draws the resulting page-table allocations from an unbounded global pool. Exploitation requires control of a guest on an Arm host; exhaustion blocks further Xen allocations, including guest creation, without itself crashing Xen or properly written guests.

CVSS severity3.8
Low
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

Resource exhaustion in all Xen versions on Arm allows guest OS users to interrupt allocation-dependent operations through P2M changes. Removing pages backed by large second-stage mappings splits them into smaller mappings and draws the resulting page-table allocations from an unbounded global pool. Exploitation requires control of a guest on an Arm host; exhaustion blocks further Xen allocations, including guest creation, without itself crashing Xen or properly written guests.

The record

CVE
CVE-2022-33747
Published
Oct 11, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-404, T1499.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 11, 2022CVE 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

3.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-404Improper Resource Shutdown or Release
T1499.001OS Exhaustion Flood

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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