CVE-2022-23084: Potential jail escape vulnerabilities in netmap

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-02-15 · updated 2026-06-17
Weakness: CWE-367

Description

The total size of the user-provided nmreq to nmreq_copyin() was first computed and then trusted during the copyin. This time-of-check to time-of-use bug could lead to kernel memory corruption. On systems configured to include netmap in their devfs_ruleset, a privileged process running in a jail can affect the host environment.

Affected products

FreeBSD: from 12.0 before 12.3; 12.3, 12.3-p1, 12.3-p2, 12.3-p3, 12.3-p4, 13.0 (+21) — fixed in 12.3

How to fix

Upgrade to a fixed version: FreeBSD 12.3. Check the vendor advisory for mitigations.

References

https://security.freebsd.org/advisories/FreeBSD-SA-22:04.netmap.asc
https://security.netapp.com/advisory/ntap-20240419-0003/
https://security.freebsd.org/advisories/FreeBSD-SA-22:04.netmap.asc
https://security.netapp.com/advisory/ntap-20240419-0003/

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