CVE-2026-101303
IPv6 UDP sendto(2) bypasses jail loopback restriction
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-941 |
| Vendor | freebsd |
| Product | freebsd |
| Published | Oct 15, 2026 |
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Affected Versions
FreeBSD / FreeBSD
15.1-RELEASE < p4 15.0-RELEASE < p14 14.5-RELEASE < p1 14.4-RELEASE < p10
References
Credits
Yuxiang Yang, Yizhou Zhao, Ao Wang, Xuewei Feng, Qi Li, and Ke Xu from Tsinghua University using GLM-5.1 from Z.ai