What’s Vulnerable › Vulnerabilities
CVE-2026-101305: Multiple jail filesystem root escapes
- Severity: high (CVSS 8.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% 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
renameat(2) did not enforce FD_RESOLVE_BENEATH on its directory arguments. A jailed process could rename a directory relative to a restricted descriptor, then escape the jail root via fchdir(2). This requires the directory to reside on a filesystem that is also reachable from the jail's root. 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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