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

CVE-2026-101303

IPv6 UDP sendto(2) bypasses jail loopback restriction PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
FreeBSD / FreeBSD	affected 15.1-RELEASE before p4; affected 15.0-RELEASE before p14; affected 14.5-RELEASE before p1; affected 14.4-RELEASE before p10

CWE

CWE-941

References

https://security.freebsd.org/advisories/FreeBSD-SA-26:69.udp.asc

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.