CVE-2022-23084

Jail escape via mutable netmap request race

Published Feb 15, 2024 · Updated Feb 13, 2025

A TOCTOU race in FreeBSD 12.3-RELEASE before p5, 13.0-RELEASE before p11, and 13.1-RC1 before p1 allows local users to affect the host. nmreq_copyin() computes the total size of a user-controlled nmreq, then trusts the mutable request during copy-in without preventing it from changing. Exploitation requires a privileged process inside a jail and netmap in that jail's devfs_ruleset; kernel memory corruption allows the process to alter the host environment.

CVSS severity7.5
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

A TOCTOU race in FreeBSD 12.3-RELEASE before p5, 13.0-RELEASE before p11, and 13.1-RC1 before p1 allows local users to affect the host. nmreq_copyin() computes the total size of a user-controlled nmreq, then trusts the mutable request during copy-in without preventing it from changing. Exploitation requires a privileged process inside a jail and netmap in that jail's devfs_ruleset; kernel memory corruption allows the process to alter the host environment.

The record

CVE
CVE-2022-23084
Published
Feb 15, 2024
Updated
Feb 13, 2025
Vendor
The FreeBSD Project
Product
FreeBSD
Classifications
CWE-367, T1611
Attack vector
local
Privileges
admin

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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=12.3-release <p5
  2. Affected versionversion=12.3-RELEASE <p5
  3. Affected versionversion=13.0-release <p11
  4. Affected versionversion=13.0-RELEASE <p11
  5. Affected versionversion=13.1-rc1 <p1
  6. Affected versionversion=13.1-RC1 <p1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The FreeBSD Project · FreeBSDversion=12.3-release <p5; version=12.3-RELEASE <p5; version=13.0-release <p11; version=13.0-RELEASE <p11; version=13.1-rc1 <p1; version=13.1-RC1 <p1

Published CVSS scores

7.4NetAppCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.5NIST NVDCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
8.2Zero Day InitiativeCVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition
T1611Escape to Host

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo