CVE-2022-23092

Host code execution via unchecked RWALK unpacking

Published Feb 15, 2024 · Updated Feb 13, 2025

Out-of-bounds write in FreeBSD 13.0 and 13.1 allows guest OS users to execute code in the bhyve host process via a crafted RWALK message. The lib9p RWALK unpacker omits a bounds check while decoding message contents, so excess data overwrites unrelated bhyve process memory. Exploitation requires a malicious guest kernel and bhyve's virtio-9p device model; resulting host code remains confined by the Capsicum sandbox.

CVSS severity8.8
High
EPSS probability0.65%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in FreeBSD 13.0 and 13.1 allows guest OS users to execute code in the bhyve host process via a crafted RWALK message. The lib9p RWALK unpacker omits a bounds check while decoding message contents, so excess data overwrites unrelated bhyve process memory. Exploitation requires a malicious guest kernel and bhyve's virtio-9p device model; resulting host code remains confined by the Capsicum sandbox.

The record

CVE
CVE-2022-23092
Published
Feb 15, 2024
Updated
Feb 13, 2025
Vendor
The FreeBSD Project
Product
FreeBSD
Classifications
CWE-787, T1068
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Feb 15, 2024CVE 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=13.0-release <p12
  2. Affected versionversion=13.0-RELEASE <p12
  3. Affected versionversion=13.1-release <p1
  4. Affected versionversion=13.1-RELEASE <p1

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The FreeBSD Project · FreeBSDversion=13.0-release <p12; version=13.0-RELEASE <p12; version=13.1-release <p1; version=13.1-RELEASE <p1

Published CVSS scores

8.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1068Exploitation for Privilege Escalation

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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