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

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.

Timeline

  1. ID reserved

    By freebsd

  2. · 17 days later

    Published

  3. · 1 day later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-101303, by who scored it
Scored byCVSSScoreVector
CISA-ADPADP (enrichment)3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
NVDNVD · Analyzed3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS (exploitation in 30 days)
0.21% · top 88% of all CVEs (12 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: yes · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.

Affected products

  • FreeBSD · FreeBSD

    • affected 15.1-RELEASE – < p4
    • affected 15.0-RELEASE – < p14
    • affected 14.5-RELEASE – < p1
    • affected 14.4-RELEASE – < p10

References

References1

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .