IPv6 UDP sendto(2) bypasses jail loopback restriction
CVSS score
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EPSS probability
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Risk score
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Published
4 h ago
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Vulnerability description
CVE AI research
DayBreach AI Explanation
Verified against sourcesSources read
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Source agreement
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Evidence confidence
%63
Short explanation
CVE-2026-101303 is a vulnerability in FreeBSD where the IPv6 UDP send path for unconnected sockets fails to apply the jail loopback rewriting policy [S0]. A process within a classic (non-VNET) jail can send UDP datagrams to services listening on the host IPv6 loopback address [S0]. This behavior bypasses established jail network isolation boundaries [S0].
This vulnerability compromises jail network isolation by allowing unauthorized processes to communicate with services listening on the host [S0]. Weakening isolation boundaries in shared or contained environments exposes host services to unintended interaction from within jails [S0].
What should be done?
- Follow the vendor security advisory
- Review available patches and system updates
- Apply recommended remediation steps based on version guidelines
Chain of evidence and sources
Bağlantısız soketler için IPv6 UDP gönderim yolu, loopback hedef adresini jail'in birincil IPv6 adresine yeniden yazma politikasını uygulamaz.
Klasik (VNET dışı) jail içerisindeki bir süreç, ana makinenin IPv6 loopback adresinde dinlenen servislere UDP datagramları gönderebilir.
Show the technical text from the sources
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
Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.
IMPACT: Affected Products and Software
Affected Products
The following products are affected by CVE-2026-101303 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.
| ID | VENDOR | PRODUCT | ACTION |
|---|---|---|---|
| 1 | freebsd | freebsd | View |
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| The sources have not yet published a verified CVSS metric. | ||||
Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-101303 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-101303 weaknesses.
Official Sources and Advisories
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