CVE-2026-101303 IPv6 UDP sendto(2) bypasses jail loopback restriction

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 networ...

CVE-2026-101303

The FreeBSD kernel contains a vulnerability in the IPv6 UDP send path for unconnected sockets. The system fails to apply the jail policy that rewrites loopback destination addresses to the jail's primary IPv6 address. This allows a process within a classic (non-VNET) jail to send UDP datagrams to...

FreeBSD : FreeBSD -- IPv6 UDP sendto(2) bypasses jail loopback restriction (6d92b2a3-bcce-11f1-906f-bc241121aa0a)

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the 6d92b2a3-bcce-11f1-906f-bc241121aa0a advisory. The IPv6 UDP send path for unconnected sockets did not apply the jail policy of rewriting a loopback...

FreeBSD Security Advisory - FreeBSD-SA-26:69.udp

FreeBSD Security Advisory - IPv6 UDP sendto2 bypasses jail loopback restriction. 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...

FreeBSD-SA-26:69.udp

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-26:69.udp Security Advisory The FreeBSD Project Topic: IPv6 UDP sendto2 bypasses jail loopback restriction Category: core Module: udp Announced: 2026-09-29...

FreeBSD -- IPv6 UDP sendto(2) bypasses jail loopback restriction

Problem 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. Impact: A process in a classic non-VNET jail can send UDP datagrams to services listening on the host's IPv6 loopback...