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CVE-2026-101304

7.1, high

When fdescfs(4) was mounted in a jail with the "nodup" option, opening /dev/fd/N returned a descriptor that did not inherit…

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
7.1, high high CVSS v3.1
EPSS, next 30 days
0.2% higher than 7.1% of scored CVEs
Exploitation
No public evidence
Published
15 Oct 20265 days ago

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.

Details

Vendor
FreeBSD
Product
FreeBSD
Weakness
CWE-273 (opens in a new tab)
Status
Analyzed
Updated
20 Oct 2026
Assigner
secteam@freebsd.org

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

References 1

Patches and fixes 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other FreeBSD CVEs

Every FreeBSD CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-101307 FreeBSD Heap-based Buffer Overflow Vulnerability EPSS 0.3% 9.1, critical

Beyond this page

Is CVE-2026-101304 in your network?

This page tells you how dangerous CVE-2026-101304 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 20 Oct 2026, not the live upstream state.