CVE-2026-101304Multiple jail filesystem root escapes
Updated under an hour ago ()
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It affects FreeBSD. Add what you run to find out whether that includes you.
EPSS puts the chance of exploitation in the next 30 days at 0.14%, higher than 3% of scored CVEs.
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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.
- CVSS
- 7.1 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- Weakness (CWE)
- CWE-273
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- 0.14% (percentile 3)
- Assigned by
- freebsd
- NVD analysis
- Modified
- Record last updated
- Oct 20, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
FreeBSD FreeBSD freebsd:freebsd (from the name) | from 15.1-RELEASE before p4; from 15.0-RELEASE before p14; from 14.5-RELEASE before p1; from 14.4-RELEASE before p10 | CNA record |
freebsd freebsd freebsd:freebsd | 14.4; 14.4; 14.4; 14.4; 14.4; 14.4; 14.4; 14.4; and 21 more ranges | NVD |
References
- https://security.freebsd.org/advisories/FreeBSD-SA-26:66.jail.ascvendor-advisory, patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.