CVE Catalog

CVE-2026-101303

HighCVSS 7.5
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.19%

8th percentile - higher than 8% of all known CVEs

Summary

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.

Risk Assessment

A process in a jail can communicate with services on the host, bypassing network isolation, potentially leading to unauthorized access or privilege escalation.

Recommendation

Update the system to a version containing the fix for this bug. Until the patch is applied, consider restricting access to services listening on the host's IPv6 loopback.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS