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.
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.
Metrics
Affected Vendors & Products
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Fixes
Solution
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Workaround
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References
History
Thu, 15 Oct 2026 07:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| Title | Multiple jail filesystem root escapes | |
| Weaknesses | CWE-273 | |
| References |
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MITRE
Status: PUBLISHED
Assigner: freebsd
Published:
Updated: 2026-10-15T06:46:03.792Z
Reserved: 2026-09-28T13:33:02.323Z
Link: CVE-2026-101304
Vulnrichment
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NVD
Status : Received
Published: 2026-10-15T07:17:57.550
Modified: 2026-10-15T07:17:57.550
Link: CVE-2026-101304
Redhat
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OpenCVE Enrichment
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Weaknesses