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CVE-2026-101304

Multiple jail filesystem root escapes

High7.1EPSS 0.15%
Published
Updated
Reserved
Assigned by
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.

Scores

CVSS scores of CVE-2026-101304, by who scored it
Scored byCVSSScoreVector
CISA-ADPADP (enrichment)3.1High7.1CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
NVDNVD · Modified3.1High7.1CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
EPSS (exploitation in 30 days)
0.15% · top 96% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.1.

Weakness

Affected products

  • FreeBSD · FreeBSD

    • affected 15.1-RELEASE – < p4
    • affected 15.0-RELEASE – < p14
    • affected 14.5-RELEASE – < p1
    • affected 14.4-RELEASE – < p10

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .