CVE-2026-101305
Published:October 15, 2026
Updated:October 22, 2026
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 Packages
https://github.com/freebsd/freebsd-src.git (GITHUB):
Affected version(s) >=release/15.1.0 <release/15.1.0-p4Fix Suggestion:
Update to version release/15.1.0-p4https://github.com/freebsd/freebsd-src.git (GITHUB):
Affected version(s) >=release/14.4.0 <release/14.4.0-p10Fix Suggestion:
Update to version release/14.4.0-p10https://github.com/freebsd/freebsd-src.git (GITHUB):
Affected version(s) =release/14.5.0 <release/14.5.0-p1Fix Suggestion:
Update to version release/14.5.0-p1https://github.com/freebsd/freebsd-src.git (GITHUB):
Affected version(s) >=release/15.0.0 <release/15.0.0-p14Fix Suggestion:
Update to version release/15.0.0-p14Related Resources (1)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.8
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Improper Check for Dropped Privileges
EPSS
Base Score:
0.42