Multiple jail filesystem root escapes
Summary
| CVE | CVE-2026-101306 |
|---|---|
| State | PUBLISHED |
| Assigner | freebsd |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-10-15 07:17:57 UTC |
| Updated | 2026-10-20 00:21:10 UTC |
| Description | 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. |
Risk And Classification
Primary CVSS: v3.1 9.8 CRITICAL from ADP
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS: 0.002680000 probability, percentile 0.178240000 (date 2026-10-20)
Problem Types: CWE-273 | CWE-281 | CWE-273 CWE-273: Improper Check for Dropped Privileges | CWE-281 CWE-281: Improper Preservation of Permissions
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | ADP | DECLARED | 9.8 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | Secondary | 9.8 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Operating System | Freebsd | Freebsd | 14.4 | - | All | All |
| Operating System | Freebsd | Freebsd | 14.4 | p1 | All | All |
| Operating System | Freebsd | Freebsd | 14.4 | p2 | All | All |
| Operating System | Freebsd | Freebsd | 14.4 | p3 | All | All |
| Operating System | Freebsd | Freebsd | 14.4 | p4 | All | All |
| Operating System | Freebsd | Freebsd | 14.4 | p5 | All | All |
| Operating System | Freebsd | Freebsd | 14.4 | p6 | All | All |
| Operating System | Freebsd | Freebsd | 14.4 | p7 | All | All |
| Operating System | Freebsd | Freebsd | 14.4 | p8 | All | All |
| Operating System | Freebsd | Freebsd | 14.4 | p9 | All | All |
| Operating System | Freebsd | Freebsd | 14.5 | - | All | All |
| Operating System | Freebsd | Freebsd | 15.0 | - | All | All |
| Operating System | Freebsd | Freebsd | 15.0 | p1 | All | All |
| Operating System | Freebsd | Freebsd | 15.0 | p10 | All | All |
| Operating System | Freebsd | Freebsd | 15.0 | p11 | All | All |
| Operating System | Freebsd | Freebsd | 15.0 | p12 | All | All |
| Operating System | Freebsd | Freebsd | 15.0 | p13 | All | All |
| Operating System | Freebsd | Freebsd | 15.0 | p2 | All | All |
| Operating System | Freebsd | Freebsd | 15.0 | p3 | All | All |
| Operating System | Freebsd | Freebsd | 15.0 | p4 | All | All |
| Operating System | Freebsd | Freebsd | 15.0 | p5 | All | All |
| Operating System | Freebsd | Freebsd | 15.0 | p6 | All | All |
| Operating System | Freebsd | Freebsd | 15.0 | p7 | All | All |
| Operating System | Freebsd | Freebsd | 15.0 | p8 | All | All |
| Operating System | Freebsd | Freebsd | 15.0 | p9 | All | All |
| Operating System | Freebsd | Freebsd | 15.1 | - | All | All |
| Operating System | Freebsd | Freebsd | 15.1 | p1 | All | All |
| Operating System | Freebsd | Freebsd | 15.1 | p2 | All | All |
| Operating System | Freebsd | Freebsd | 15.1 | p3 | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | FreeBSD | FreeBSD | affected 15.1-RELEASE p4 release | Not specified |
| CNA | FreeBSD | FreeBSD | affected 15.0-RELEASE p14 release | Not specified |
| CNA | FreeBSD | FreeBSD | affected 14.5-RELEASE p1 release | Not specified |
| CNA | FreeBSD | FreeBSD | affected 14.4-RELEASE p10 release | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| security.freebsd.org/advisories/FreeBSD-SA-26:66.jail.asc | [email protected] | security.freebsd.org | Patch, Vendor Advisory |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Jan Bramkamp (en)
There are currently no legacy QID mappings associated with this CVE.