Multiple jail filesystem root escapes
When fdescfs(4) was mounted in a jail with the "nodup" option, opening /dev/fd/N returned a descriptor that did not inherit FD_RESOLVE_BENEATH or the Capsicum capability rights of descriptor N. 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.
CVE-2026-101304
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-101304
FreeBSD
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "FreeBSD",
"modules": [
"jail"
],
"product": "FreeBSD",
"versions": [
{
"status": "affected",
"version": "15.1-RELEASE",
"lessThan": "p4",
"versionType": "release"
},
{
"status": "affected",
"version": "15.0-RELEASE",
"lessThan": "p14",
"versionType": "release"
},
{
"status": "affected",
"version": "14.5-RELEASE",
"lessThan": "p1",
"versionType": "release"
},
{
"status": "affected",
"version": "14.4-RELEASE",
"lessThan": "p10",
"versionType": "release"
}
],
"defaultStatus": "unknown"
}
]- Related CVEs
- CVE-2026-101304
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #42385 · Revision 1
- Added to Heist Feed
- Publisher date