CVE-2026-101304
Last modified
CVE-2026-101304 is a high-severity vulnerability rated 7.1/10 on the CVSS scale. 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.. EPSS estimates a 0.14% chance of exploitation in the next 30 days.
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.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Freebsd | Freebsd | 14.4 |
| Freebsd | Freebsd | 14.5 |
| Freebsd | Freebsd | 15.0 |
| Freebsd | Freebsd | 15.1 |
References
- https://security.freebsd.org/advisories/FreeBSD-SA-26:66.jail.ascPatch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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