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Copyright ยฉ 2026 HOL DAO LLC. All rights reserved.

Back to active CVEs
Unknown severity ยท Source severity not reportedCVE-2026-101303

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

Answer in brief

CVE-2026-101303 records a Unknown severity vulnerability in IPv6 UDP sendto(2) bypasses jail loopback restriction. The current sources do not mark it as known exploited. The current feed maps FreeBSD/FreeBSD (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 15, 2026Updated Oct 15, 2026Source checked Oct 15, 2026First seen by HOL Oct 15, 2026Material review Oct 15, 2026
Upstream Advisory

Key facts

Risk
Unknown severitySource severity not reported
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps FreeBSD/FreeBSD (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
FreeBSD/FreeBSDgeneric>=15.1-RELEASE <p4 || >=15.0-RELEASE <p14 || >=14.5-RELEASE <p1 || >=14.4-RELEASE <p10p4, p14, p1, p10

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for FreeBSD/FreeBSD.
  2. 2Review the reported fix. Update FreeBSD/FreeBSD to p4 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 15, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 15, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 15, 2026

Sources and claim methodology

  • Source referencesecurity.freebsd.org
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Remote DoS via receive-side kernel TLSSame freebsd/freebsd package
  • Multiple jail filesystem root escapesSame freebsd/freebsd package
  • Multiple jail filesystem root escapesSame freebsd/freebsd package
  • Multiple jail filesystem root escapesSame freebsd/freebsd package
  • Remotely triggerable buffer overflow in tcp_rackSame freebsd/freebsd package
  • TOCTOU race between sound(4) buffer resizing and mmapSame freebsd/freebsd package

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-941
Source
CVE List V5
Source checked
Oct 15, 2026
References
1 linked source
Open source record