CVE-2022-36660

Guest-to-host memory corruption via unchecked virtqueue chain

Published Sep 7, 2022 · Updated Jun 17, 2025

Stack buffer overflow in xhyve commit dfbe09b allows guest OS users to corrupt hypervisor-process memory through virtio-rnd queue I/O. The pci_vtrnd_notify function ignores a failed vq_getchain call, then passes an uninitialized iov_base pointer and length to read. A crafted guest queue reaches this path, but the published test did not demonstrate reliable exploitation beyond the process-memory primitive.

CVSS severity9.8
Critical
EPSS probability1.00%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack buffer overflow in xhyve commit dfbe09b allows guest OS users to corrupt hypervisor-process memory through virtio-rnd queue I/O. The pci_vtrnd_notify function ignores a failed vq_getchain call, then passes an uninitialized iov_base pointer and length to read. A crafted guest queue reaches this path, but the published test did not demonstrate reliable exploitation beyond the process-memory primitive.

The record

CVE
CVE-2022-36660
Published
Sep 7, 2022
Updated
Jun 17, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787
Attack vector
local
Privileges
Unavailable

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 vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write

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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