CVE-2026-101304CWE-273

CVE-2026-101304

High · published October 15, 2026

CVSS v3.1
7.1
EPSS
0%
Percentile
3.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.1 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00143 · 3.2th percentile
Weakness
CWE-273 · Improper Check for Dropped Privileges
Published
2026-10-15T11:17Z
Affected products (29)
ProductVersionsFixed in
freebsd/freebsdall versions—
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freebsd/freebsdall versions—
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freebsd/freebsdall versions—
freebsd/freebsdall versions—
freebsd/freebsdall versions—
freebsd/freebsdall versions—
freebsd/freebsdall versions—
freebsd/freebsdall versions—
freebsd/freebsdall versions—
freebsd/freebsdall versions—
freebsd/freebsdall versions—
freebsd/freebsdall versions—
freebsd/freebsdall versions—
freebsd/freebsdall versions—
References (1)
https://security.freebsd.org/advisories/FreeBSD-SA-26:66.jail.asc · [email protected]
EPSS history
Timeline
  • 16 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 15 OCT 06:46Z
    Multiple jail filesystem root escapes
    cvelistv5
  • 15 OCT 06:46Z
    Multiple jail filesystem root escapes
    cvelistv5