CVE-2026-101305

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.

Score
CVSS 3.1 8.8 High
Status
Analyzed - secteam@freebsd.org
Published
2026-10-15
Last modified
2026-10-20
Weaknesses
CWE-273

Affected products

References

 
 
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