CVE-2026-101303

HighCVSS 7.5/10Last modified Oct 20, 2026

Description

The IPv6 UDP send path for unconnected sockets did not apply the jail policy of rewriting a loopback destination address to the jail's primary IPv6 address.

A process in a classic (non-VNET) jail can send UDP datagrams to services listening on the host's IPv6 loopback address, bypassing jail network isolation.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Weakness enumeration

CWE-941

Affected software

Vendor	Product	Versions
FreeBSD	FreeBSD	>= 15.1-RELEASE, < p4; >= 15.0-RELEASE, < p14; >= 14.5-RELEASE, < p1; >= 14.4-RELEASE, < p10

References

https://security.freebsd.org/advisories/FreeBSD-SA-26:69.udp.ascPatch, Vendor Advisory

Timeline

Published: Oct 15, 2026
Last modified: Oct 20, 2026
NVD status: Analyzed

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