CVE-2022-36661Network attack vector

Guest VM crash via unchecked config callback

Published Sep 7, 2022 · Updated Jun 17, 2025

NULL pointer dereference in xhyve commit dfbe09b allows guest OS users to crash the guest VM process through a crafted config read. The pci_virtio_rnd device registers vc_cfgread as NULL, but vi_pci_read invokes the callback without checking it when the guest requests configuration data. Guest control of a VM with the VirtIO entropy device is required, and exploitation interrupts only that VM process.

CVSS severity6.5
Medium
EPSS probability0.83%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in xhyve commit dfbe09b allows guest OS users to crash the guest VM process through a crafted config read. The pci_virtio_rnd device registers vc_cfgread as NULL, but vi_pci_read invokes the callback without checking it when the guest requests configuration data. Guest control of a VM with the VirtIO entropy device is required, and exploitation interrupts only that VM process.

The record

CVE
CVE-2022-36661
Published
Sep 7, 2022
Updated
Jun 17, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-476, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 7, 2022CVE publishedPublication date reported by the CVE source.
  2. Jun 17, 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 vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
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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