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OL 9 must enable kernel parameters to enforce discretionary access control on hardlinks.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-271740OL09-00-002401SV-271740r1091932_ruleCCI-002165medium
Description
By enabling the fs.protected_hardlinks kernel parameter, users can no longer create soft or hard links to files they do not own. Disallowing such hardlinks mitigates vulnerabilities based on insecure file system accessed by privileged programs, avoiding an exploitation vector exploiting unsafe use of open() or creat(). Satisfies: SRG-OS-000312-GPOS-00123, SRG-OS-000324-GPOS-00125
STIGDate
Oracle Linux 9 Security Technical Implementation Guide2026-02-17

Related Frameworks

1 mapping across 2 frameworks
NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (15) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

AC-3Access Enforcement
1.00
AC-3(13)Attribute-based Access Control
1.00
AC-3(4)Discretionary Access Control
1.00
AC-3(7)Role-based Access Control
1.00
AC-6(10)Prohibit Non-privileged Users from Executing Privileged Functions
1.00
AC-6(8)Privilege Levels for Code Execution
1.00
CM-11(2)Software Installation with Privileged Status
1.00
CM-6Configuration Settings
1.00
CM-7(2)Prevent Program Execution
1.00
CM-7(5)Authorized Software — Allow-by-exception
1.00

+5 more (top 10 by confidence shown)

CCI1 mapping
CCI-002165
1.00

Details

Check Text (C-271740r1091932_chk)

Verify that OL 9 is configured to enable DAC on hardlinks. Check the status of the fs.protected_hardlinks kernel parameter with the following command: $ sudo sysctl fs.protected_hardlinks fs.protected_hardlinks = 1 If "fs.protected_hardlinks" is not set to "1" or is missing, this is a finding.

Fix Text (F-75697r1091931_fix)

Configure OL 9 to enable DAC on hardlinks with the following: Add or edit the following line in a system configuration file in the "/etc/sysctl.d/" directory: fs.protected_hardlinks = 1 Load settings from all system configuration files with the following command: $ sudo sysctl --system