CVE-2022-33746

Host-wide denial of service via P2M pool freeing

Published Oct 11, 2022 · Updated Aug 3, 2024

A denial-of-service flaw in Xen 4.13.0 through 4.16.1 allows local users in collaborating guest VMs to interrupt the host via P2M pool freeing. The hypervisor frees a potentially large P2M pool without intermediate preemption checks, allowing the operation to hold a CPU for an excessive interval. Exploitation requires cooperating guests and local guest access; the reported consequence is a temporary host-wide service interruption.

CVSS severity6.5
Medium
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

A denial-of-service flaw in Xen 4.13.0 through 4.16.1 allows local users in collaborating guest VMs to interrupt the host via P2M pool freeing. The hypervisor frees a potentially large P2M pool without intermediate preemption checks, allowing the operation to hold a CPU for an excessive interval. Exploitation requires cooperating guests and local guest access; the reported consequence is a temporary host-wide service interruption.

The record

CVE
CVE-2022-33746
Published
Oct 11, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-404, T1499
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

6.5NIST NVDCVSS: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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-404Improper Resource Shutdown or Release
T1499Endpoint Denial of Service

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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