OL 9 must restrict exposed kernel pointer addresses access.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-271747 | OL09-00-002408 | SV-271747r1091953_rule | CCI-001082 | medium |
| Description | ||||
| Exposing kernel pointers (through procfs or "seq_printf()") exposes kernel writeable structures, which may contain functions pointers. If a write vulnerability occurs in the kernel, allowing write access to any of this structure, the kernel can be compromised. This option disallows any program without the CAP_SYSLOG capability to get the addresses of kernel pointers by replacing them with "0". Satisfies: SRG-OS-000132-GPOS-00067, SRG-OS-000433-GPOS-00192 | ||||
| STIG | Date | |||
| Oracle Linux 9 Security Technical Implementation Guide | 2025-05-08 | |||
Details
Check Text (C-271747r1091953_chk)
Verify that OL 9 restricts access to exposed kernel pointers with the following command:
$ sysctl kernel.kptr_restrict
kernel.kptr_restrict = 1
Fix Text (F-75704r1091952_fix)
Configure OL 9 to prevent the leak of kernel pointers to unprivileged users.
Add or edit the following line in /etc/sysctl.d/99-sysctl.conf system configuration file:
kernel.kptr_restrict = 1
Reload settings from all system configuration files with the following command:
$ sudo sysctl --system