CVE-2026-101306

Status: AnalyzedCritical (9.8)—

Severity9.8Critical · CVSS 3.1

Exploitation probability0.27 %higher than 18% of CVEs

Active exploitationNonot in the CISA catalog

Public exploitNot knownno public code found

SCM_RIGHTS file descriptor passing did not preserve FD_RESOLVE_BENEATH when a descriptor was transferred. A process could clear the restriction by sending the descriptor to itself over a Unix domain socket.

A process in a jail that has received a directory file descriptor from another jail can use these techniques to escape the jail's filesystem root restriction.

CVSS

Base score: 9.8
Version: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.27 %
Percentile among all scored CVEs: 18
Score date: 10/20/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

ExploitationT1190 Exploit Public-Facing Applicationinitial access90 %
Primary impactT1611 Escape to Hostprivilege escalation80 %
Secondary impactT1005 Data from Local Systemcollection40 %

Vector AV:N/AC:L/PR:N/UI:N; un proceso en una jail escapa de la restricción de raíz del sistema de archivos al recibir un descriptor de directorio, perdiendo FD_RESOLVE_BENEATH.

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

ATT&CK mitigations that cover these techniques

Privileged Account Management Application Isolation and Sandboxing Update Software Vulnerability Scanning Network Segmentation Limit Access to Resource Over Network

Affected technologies (1)

Freebsd — Freebsd

CWEs

CWE-273, CWE-281

References

Show 1 references

https://security.freebsd.org/advisories/FreeBSD-SA-26:66.jail.asc

Raw JSON (NVD)

Show

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