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CVE-2026-101306

Multiple jail filesystem root escapes

Critical9.8EPSS 0.27%
Published
Updated
Reserved
Assigned by
freebsd

Description

SCM_RIGHTS file descriptor passing did not preserve FD_RESOLVE_BENEATH when a descriptor was transferred. A process could clear the restriction by sending the descriptor to itself over a Unix domain socket. 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-2026-101306, by who scored it
Scored byCVSSScoreVector
CISA-ADPADP (enrichment)3.1Critical9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVDNVD · Analyzed3.1Critical9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
0.27% · top 81% of all CVEs (5 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: yes · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.

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 .