CVE-2026-101304
Received Received - Intake

Jail Escape via fdescfs nodup Option in FreeBSD

Publication date: 2026-10-15

Last updated on: 2026-10-15

Assigner: FreeBSD

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.

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Meta Information

Published
2026-10-15
Last Modified
2026-10-15
Generated
2026-10-15
EPSS Evaluated
N/A
NVD
CVE-2026-101304
EUVD
EUVD-2026-101865

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
FreeBSD FreeBSD 15.1-RELEASE
FreeBSD FreeBSD 15.0-RELEASE
FreeBSD FreeBSD 14.5-RELEASE
FreeBSD FreeBSD 14.4-RELEASE

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-273 The product attempts to drop privileges but does not check or incorrectly checks to see if the drop succeeded.

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