What’s Vulnerable › Vulnerabilities
CVE-2026-101304: Multiple jail filesystem root escapes
- Severity: high (CVSS 7.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.1% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-10-15 · updated 2026-10-20
- Weakness: CWE-273
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.
Affected products
- FreeBSD: 14.4, 14.4-p1, 14.4-p2, 14.4-p3, 14.4-p4, 14.4-p5 (+23)
References
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