renameat(2) did not enforce FD_RESOLVE_BENEATH on its directory arguments. A jailed process could rename a directory relative to a restricted descriptor, then escape the jail root via fchdir(2). This requires the directory to reside on a filesystem that is also reachable from the jail's root.
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.
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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 | renameat(2) did not enforce FD_RESOLVE_BENEATH on its directory arguments. A jailed process could rename a directory relative to a restricted descriptor, then escape the jail root via fchdir(2). This requires the directory to reside on a filesystem that is also reachable from the jail's root. 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: 2026-10-15T06:46:16.471Z
Reserved: 2026-09-28T13:33:02.323Z
Link: CVE-2026-101305
Vulnrichment
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NVD
Status : Received
Published: 2026-10-15T07:17:57.663
Modified: 2026-10-15T07:17:57.663
Link: CVE-2026-101305
Redhat
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OpenCVE Enrichment
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Weaknesses